Specific

1,25-dihydroxyvitamin D in serum 1,25-dihydroxyvitamin D2 in serum 1,3 beta glucan in serum 1,4-alpha-glucan-branching enzyme in serum 1,5-anhydroglucitol in serum (GlycoMark) 1-methylhistidine in body fluid 11-deoxycorticosterone in body fluid 11-deoxycortisol in body fluid 11-hydroxyandrosterone (11-hydroxyetiocholanolone) in body fluid 11-ketoandrosterone in body fluid 17-hydroxycorticosteroids in body fluid 17-hydroxypregnenolone in body fluid 17-hydroxyprogesterone in body fluid 17-ketogenic steroids in body fluid 18-hydroxycorticosteroids in serum 18-hydroxycorticosterone in body fluid 18-hydroxycortisol in body fluid 18-hydroxydeoxycorticosterone in body fluid 2,3-diphosphoglycerate measurement 2-hydroxy-3-methylvalerate in body fluid 2-hydroxyadipate in body fluid 2-hydroxyglutarate in body fluid 2-hydroxyisocaproate in body fluid 2-methyl-3-hydroxybutyrate in body fluid 2-methylacetoacetate in body fluid 2-methylcitrate in body fluid 2-oxo,3-methylvalerate in body fluid 2-oxoadipate (alpha-ketoadipate) in body fluid 2-oxoisocaproate in body fluid 2-oxoisovalerate in body fluid 20-hydroxyprogesterone in serum 25-hydroxyvitamin D2/D3 (calcidiol/calcifediol) in serum 3-alpha-androstanediol glucuronide in body fluid 3-beta-androstanediol in serum/plasma 3-hydroxy-3-methylglutarate in body fluid 3-hydroxyadipate in body fluid 3-hydroxyanthranilate in body fluid 3-hydroxydodecanoate in body fluid 3-hydroxyglutarate in body fluid 3-hydroxyisobutyrate dehydrogenase in fibroblasts 3-hydroxyisobutyrate in body fluid 3-hydroxyisobutyryl-CoA hydrolase in fibroblasts 3-hydroxykynurenin in body fluid 3-hydroxypropionate in body fluid 3-hydroxyvalerate in body fluid 3-methoxy-4-hydroxyphenylglycol (vanylglycol) in body fluid 3-methoxydopa in body fluid 3-methoxytyramine in body fluid 3-methylcrotonyl-CoA carboxylase in fibroblasts 3-methylglutaconate in body fluid 3-methylglutaconyl-CoA hydratase in fibroblasts 3-methylglutarate in body fluid 3-methylhistidine in body fluid 4-hydroxybenzoate in body fluid 4-hydroxyphenylacetate in body fluid 4-hydroxyphenyllactate in body fluid 4-hydroxyphenylpyruvate in body fluid 4-pyridoxate in serum/plasma 5,10-methylenetetrahydrofolate reductase measurement 5,6-dihydrouracil in body fluid 5,6-dihydrouridine in body fluid 5-dehydrocholesterol body fluid 5-hydroxyhexanoatein body fluid 5-hydroxyindoleacetic acid in body fluid 5-hydroxymethyluracil in body fluid 5-hydroxytryptophan in body fluid 5-Methyltetrahydrofolate in CSF 5-Methyltetrahydrofolate in serum/plasma 5-oxoproline body fluid 6-phosphogluconate dehydrogenase in erythrocytes 7,8-dihydrobiopterin in CSF 8-dehydrocholesterol serum/plasma 8-hydroxyamoxapine in body fluid A50 Assay (serum) acetate measurement acetylcholine in serum acetylcholinesterase measurement acid alpha glucosidase measurement acid sphingomyelinase measurement aconitate in body fluid acrosin in spermatozoa acyl CoA dehydrogenase in fibroblasts acyl CoA dehydrogenase in serum acylcarnitine in serum/plasma acylcarnitine in specimen; acylcarnitine measurement acylglycine in specimen adenine in body fluid adenine phosphoribosyltransferase measurement adenosine deaminase measurement adenosine diphosphate in specimen adenosine in body fluid adenosine monophosphate deaminase in serum adenosine triphosphatase measurement adenosylhomocysteine hydrolase in erythrocytes adenylate kinase measurement adenylosuccinate in body fluid adenylosuccinate lyase measurement adipate in body fluid adiponectin in serum/plasma adipoylcarnitine in specimen adrenoleukodystrophy protein in fibroblasts aflatoxin in specimen alanine aminopeptidase in serum albumin in specimen alcohol dehydrogenase in liver alcohol dehydrogenase in serum aldolase measurement aldosterone in body fluid aldosterone receptors in leukocytes aliphatic carboxylate C20-0/C26-0 in serum/plasma aliphatic carboxylate in C14-C26 body fluid aliphatic carboxylate.absorption in C14-C26 serum/plasma alpha aminoadipate in body fluid alpha melanocyte stimulating hormone (MSH) in serum/plasma alpha-1 antichymotrypsin in specimen alpha-1 antitrypsin in body fluid (AAT) alpha-1-fetoprotein Ag in tissue alpha-1-fetoprotein in body fluid alpha-2-antiplasmin in plasma alpha-2-retinol binding protein body fluid alpha-amanitin in body fluid alpha-fucosidase measurement alpha-galactosidase A measurement alpha-galactosidase in specimen alpha-hydroxybutyrate dehydrogenase in serum/plasma alpha-hydroxybutyrate in body fluid alpha-L-iduronidase measurement alpha-linolenate in specimen alpha-mannosidase measurement alpha-methylacyl CoA racemase in fibroblasts alpha-N-acetylglucosaminidase measurement alpha-synuclein seed amplification assay; CSF alpha-synuclein (SYNTap test) amino acid nitrogenin body fluid amino acid in specimen amino beta guanidinopropionate in body fluid amyl ether in blood amylo-1,6-glucosidase in erythrocytes amylo-alpha-1,6-glucosidase in leukocytes amyloid A in serum/plasma amyloid typing amyloid-associated protein in serum amyloid-beta peptide in body fluid androstanediol glucuronide in serum androstanediol in body fluid androstenediol in body fluid androstenedione in body fluid androsterone in body fluid angiotensin 1 in plasma angiotensin II in plasma/CSF angiotensin-converting enzyme in body fluid angiotensinogen in plasma anserine in body fluid anthranilate in body fluid antithrombin 3 in plasma (antithrombin 3 assay) apelin in serum/plasma apolipoprotein in serum/plasma/blood arachidate measurement; eicosanoate measurement arachidonate measurement arginase in erythrocytes arginase-1 in serum argininosuccinate in body fluid argininosuccinate lyase measurement argininosuccinate synthase measurement arylamidase in body fluid arylsulfatase in specimen ascorbate in specimen aspartylglucosaminidase in fibroblasts aspartylglucosaminidase in leukocytes aspartylglucosaminidase measurement; aspartylglucosaminidase in specimen atrial natriuretic factor/peptide/hormone (ANF/ANP/ANH) in blood/plasma aturated fatty acids in serum/plasma B-type natriuretic peptide (BNP & N-terminal pro-BNP) in serum/plasma/blood B-type natriuretic peptide prohormone in body fluid bentiromide (PABA or Chymex) test benzoate in body fluid beta aminobutyrate in body fluid beta defensin in stool beta melanocyte stimulating hormone (MSH) in serum/plasma beta sitosterol in serum/plasma beta-2 glycoprotein-1 in serum/plasma; apolipoprotein H in serum/plasma beta-alanine in body fluid beta-aminoisobutyrate in body fluid beta-chorionic gonadotropin (hCG) in specimen beta-endorphin in serum/plasma beta-fructofuranosidase measurement beta-galactosidase measurement beta-glucosidase in measurement beta-glucuronidase measurement; beta-glucuronidase in specimen beta-hydroxybutyrate dehydrogenase in serum/plasma/blood beta-lipotropin in serum beta-mannosidase in specimen beta-N-acetylhexosaminidase measurement beta-trace protein in body fluid betamethasone in body fluid bile acids measurement; bile acids in specimen bile in body fluid bioavailable testosterone biopterin in body fluid biotin in serum/plasma/blood biotinidase in serum/plasma/blood bombesin in plasma bradykinin in serum branched (b)DNA assay (bDNA) Bruton tyrosine kinase in B cells+monocytes butyrate in stool C-peptide in body fluid C1-esterase inhibitor Ab C1-esterase inhibitor assay calcidiol in blood calciferol binding proteins in serum calcitonin measurement calcium measurement; calcium in specimen calcium phosphate measurement calcium-calmodulin-dependent protein kinase II activity in serum calprotectin in stool (S100A8/A9 in stool) campesterol in serum/plasma carbamoyl phosphate synthetase measurement carbohydrate in specimen carbonic anhydrase in erythrocytes cardiolipin in serum carnitine acyltransferase measurement carnitine free measurement carnitine in specimen carnitine palmitoyltransferase 1 measurement carnitine palmitoyltransferase 2 measurement carnosine in body fluid carotene in body fluid cartilage oligomeric matrix protein in serum catalase measurement catechol in specimen catecholamines in body fluid cathepsin D in specimen cathepsin K in serum/plasma cathepsin L in serum/plasma cathepsin S in serum/plasma CCL11 in CSF cerebroside sulfatase measurement cerebrospinal fluid (CSF) protein electrophoresis ceruloplasmin in body fluid chemokine (C-C motif) ligand 17 in serum chemokine (C-C motif) ligand 18 in serum chenodeoxycholate in serum chenodeoxycholylglycine in serum chitotriosidase in body fluid chloral hydrate in body fluid cholate in serum cholecystokinin (CCK)/pancreozymin in plasma cholestanol in serum/plasma cholesterol chylomicrons in serum cholesterol efflux capacity cholesterol ester in serum/plasma cholesterol ester transfer protein (CETP) in serum/plasma cholesterol esterase measurement cholesterol IDL in serum cholesterol IDL+VLDL3 in serum cholesterol sulfate in serum/plasma cholesterol VLDL in serum cholylglycine in serum chondroitin sulfate B in serum/urine choriogonadotropin in body fluid choriomammotropin in serum/amniotic fluid; placental lactogen in serum/amniotic fluid chorionic gonadotropin stimulation panel, estradiol response chorionic gonadotropin stimulation panel, testosterone response chromogranin A in body fluid chylomicron remnant cholesterol in serum chylomicrons in body fluid chymopapain in serum/plasma chymotrypsin antigen in serum chymotrypsin in body fluid citrate in body fluid citrate synthase measurement Clara cell protein 16 in serum coenzyme Q cytochrome C reductase in tissue coenzyme Q10.reduced in serum/plasma collagen crosslinks collagenase in serum complement + immunoglobulin in erythrocytes complement C1 in serum/plasma complement C1r in serum/plasma complement C1r2+C1s2 in serum/plasma complement C1s (C1-esterase) in serum/plasma complement C3 fragment in erythrocytes complement C4b binding protein in serum/plasma complement decay accelerating factor in erythrocytes complement factor Ba in serum/plasma complement factor Bb in serum/plasma complement factor D in serum/plasma complement factor H in serum/plasma complement factor I in serum/plasma complement factor P in plasma complement iC3 in plasma complement iC3b receptors in leukocytes copeptin in serum copper measurement; copper in specimen coproporphyrinogen oxidase measurement corticosterone in body fluid corticotropin in body fluid corticotropin-releasing hormone in serum/plasma cortisol in specimen cortisone in body fluid cosyntropin (ACTH, Cortrosyn) stimulation test (delta cortisol test) creatine in body fluid crosslinked C-telopeptide in serum/plama crosslinked N-telopeptide in serum CSF for beta amyloid 1-42 & tau CSF real time quaking-induced conversion assay cyclic AMP in body fluid cyclic GMP in serum/plasma cystathionine beta-synthase in fibroblasts cystathionine in body fluid cystine measurement cystine+cysteine in serum/plasma cystinyl aminopeptidase in serum cytidine in body fluid cytochrome B reductase in amniotic fluid cytochrome B5 reductase in serum cytochrome C oxidase in specimen cytokeratin 19 in body fluid cytokines in serum/plasma cytosine in body fluid cytosol aminopeptidase in serum/plasma; leucine aminopeptidase in serum/plasma D-serine in body fluid D-xylose absorption test decadienoylcarnitine in specimen decanoate in specimen decenoate in specimen dehydroascorbate in serum/plasma dehydroepiandrosterone (DHEA) in body fluid dehydroepiandrosterone (DHEA) sulfate in body fluid delta bilirubin in serum; bilirubin, albumin-bound in serum delta tocopherol in serum/plasma delta-aminolevulinic acid (ALA) in body fluid deoxyadenosine in body fluid deoxycholate in serum deoxycholylglycine in serum deoxyguanosine in body fluid deoxyinosine in body fluid deoxyuridine in body fluid deoxyuridine suppression test (dUST) deprecated complement C2' esterase deprecated complement C3' esterase deprecated complement C3PA deprecated complement C4' esterase deprecated complement protein dermatan sulfatee in body fluid des-gamma-carboxy-prothrombin (acarboxyprothrombin) in serum desmosterol in serum/plasma dexamethasone in body fluid diamine oxidase in serum/plasma dicarboxylate C6-C8-C10 in body fluid dihomo alpha-linolenate in serum/plasma dihomogammalinolenate (8,11,14-eicosatrienoic acid; C20:3w6) in specimen dihydrofolate in serum dihydrolipoamide acetyl transferase in tissue dihydrolipoamide dehydrogenase in tissue dihydroorotate in specimen dihydropteridine reductase in specimen dihydrotestosterone (androstanolone) in body fluid dihydrothymine in specimen dihydroxyacetone phosphate acyltransferase in fibroblasts dipalmitoylphosphatidylcholine (dipalmitoyllecithin) in serum diphosphoglycerate mutase in erythrocytes diphosphoglycerate phosphatasein erythrocytes docosadienoate in specimen docosahexaenoate in specimen docosapentaenate (C22:5w3) in specimen docosapentaenate (C22:5w6) in specimen docosatetraenoate (C22:4w6) in specimen docosatrienoate (C22:3w9) in specimen docosenoate in specimen dolichol in body fluid dopamine beta-hydroxylase in serum/plasma dysferlin in leukocytes E-selectinin blood E-selectinin serum/plasma eicosapentaenoate in specimen endothelin in serum/plasma enolase measurement enteroglucagon in serum enteropeptidase (enterokinase) in plasma enzyme activity in cells/tissue eosinophil cationic protein in body fluid epiandrosterone in serum/plasma epididymis protein 4 (HE4, WAP5, WFDC2) in serum epitestosterone in body fluid ergosterol in serum/plasma erythrocyte transketolase erythropoietin in serum estradiol in specimen estriol in body fluid estrogen in body fluid estrogen-binding protein in serum/plasma estrogens in serum estrone in body fluid estrone sulfate in serum ethanolamine in body fluid etiocholanolone in body fluid expired gas analysis; exhaled breath analysis fat in body fluid fatty acids in specimen fatty esters in specimen ferritin measurement ferrochelatase in serum fetal fibronectin in cervical-vaginal fluid fetal lung maturity assessment fgalactosamine in specimen fibrin fragments Ag in plasma fibrin fragments in plasma fibrinogen fragments in body fluid fibrinogen in plasma fibronectin in plasma flavin adenine dinucleotide in specimen flavin mononucleotide in specimen fms-like tyrosine kinase-1 in serum follicle-stimulating hormone (FSH) beta in serum follicle-stimulating hormone (FSH) in body fluid formate in body fluid frataxin in blood free cortisol in serum free hydroxyproline in serum/plasma/urine free inositol in serum/urine free insulin in serum free magnesium (Mg+2) in serum free testosterone fructokinase in serum fructosamine in serum fructose in body fluid fumarase measurement fumarate in body fluid galactitol in body fluid galactocerebrosidase measurement galactokinase in specimen galactomannan Ag in specimen galactose in body fluid galactose in erythrocytes galactose-1-phosphate measurement galactose-1-phosphate uridyltransferase in blood galactose-alpha-1,3-galactose (alpha-gal) IgE in serum/plasma galactosylceramidase in specimen galactosylgalactosylglucosylceramidase in tissue gamma aminobutyrate in body fluid gamma globulin in CSF gamma glutamylcysteine synthetase in serum gamma melanocyte stimulating hormone (MSH) in serum/plasma gamma-amanitin in body fluid gamma-butyrobetaine in specimen gamma-glutamylcysteine synthetase in erythrocytes gamma-glutamyltransferase in body fluid gamma-interferon in blood gamma-linolenate in specimen gastric acid secretion gastric inhibitory polypeptide in plasma gastrin in serum gastrin releasing polypeptide in body fluid gel diffusion ghrelin in serum/plasma glial fibrillary acidic protein (GFAP) in blood/plasma/serum glucagon in body fluid glucosamine N-acetyltransferase measurement glucose phosphate isomerase measurement glucose, protein bound in serum glucose-6-phosphatase measurement glucose-6-phosphate dehydrogenase in specimen glucosidase in semen glucosylceramidase in tissue glutamate dehydrogenase in serum/plasma/leukocytes/tissue glutarate in body fluid glutaryl CoA dehydrogenase measurement glutathione in specimen glutathione peroxidase measurement glutathione reductase measurement glutathione S-transferase in erythrocytes glutathione synthase in erythrocytes glycated albumin (fructosamine) in serum glycated protein in blood/body fluid glyceraldehyde-3-phosphate dehydrogenase measurement glycerate in body fluid glycerol in body fluid glycogen synthase in serum glycolate measurement; glycolate in specimen glycoprotein acetyl in serum glycoprotein hormone alpha in serum glycoproteins in body fluid gonadotropin releasing hormone (GNRH) in serum/plasma gonadotropins in serum granulocyte colony stimulating factor in serum/plasma growth factor in serum/plasma/blood growth hormone (GH) stimulation test growth hormone (sommatotropin) in amniotic fluid growth hormone (sommatotropin) in body fluid growth hormone-binding protein in serum; sommatotropin-binding protein in serum guanidinoacetate (glycocyamine) in specimen guanine deaminase in body fluid guanine in specimen guanosine in body fluid haptoglobin in body fluid heavy metal qualitative screen heavy metals quantitative hematoporphyrin in stool hemoglobin A1c in red blood cells (Tina-quant HbA1cDx) hemoglobin SS & hemoglobin SC in amniotic fluid hemopexin in body fluid hemosiderin in specimen heparan sulfate in body fluid heparan-N-sulfatase in specimen heparin-binding protein in CSF hepatocyte growth factor in serum hepcidin in serum/plasma heptacarboxylate in body fluid heptacarboxylporphyrin measurement heterophile antibody hexacarboxylporphyrin measurement hexachlorophene in blood hexanoate (caproate) in serum/plasma hexokinase measurement hippurate in body fluid histamine in body fluid histidine ammonia lyase in serum HIV Ag/Ab Combo assay (ARCHITECT HIV Ag/Ab Combo assay) homocarnosine in specimen homocysteine in body fluid homovanillate in body fluid hydrogen in expired gas hydrogen sulfide measurement Hydroxycobalamin in body fluid hydroxylysine measurement hydroxymethylglutaryl CoA lyase measurement hypoxanthine in body fluid hypoxanthine phosphoribosyltransferase measurement IDI group B Streptococcus assay iditol dehydrogenase in body fluid iduronate-2-sulfatase measurement IgA antigen in tissue IGF-2 in serum IGF-binding protein 1 in body fluid IGF-binding protein 2 in serum IGF-binding protein 3 in body fluid immunoglobulin light chains in body fluid immunosuppressive acidic protein in serum/plasma indole in serum inhibin A [Multiple of the median] (MOM) adjusted in serum inhibin in serum/plasma inosine in body fluid insulin in body fluid insulin in serum insulin tolerance test (ITT) inter alpha trypsin inhibitor in serum interferon gamma in body fluid interferon in serum/plasma interleukin 1 (IL1) alpha in body fluid interleukin 1 (IL1) beta in body fluid interleukin 1 (IL1) in serum/plasma interleukin 1 receptor alpha in serum/plasma interleukin 10 (IL-10) in body fluid interleukin 12 (IL-12) in body fluid interleukin 13 in body fluid interleukin 17A in serum/plasma interleukin 18 in serum/plasma interleukin 2 (IL2) in body fluid interleukin 2 (IL2) receptor in specimen interleukin 3 (IL3) in body fluid interleukin 4 (IL4) in body fluid interleukin 5 (IL5) in body fluid interleukin 6 (IL6) in body fluid interleukin 7 (IL7) in body fluid interleukin 8 (IL8) in body fluid interleukin-2 receptor alpha in serum intermediate density lipoprotein in serum/plasma inulin in serum/plasma iodide in specimen iodine measurement ionized Ca+2 in serum/plasma/blood isocitrate dehydrogenase in serum/plasma isocitrate in body fluid isocoproporphyrin in stool isomaltase in tissue keratan sulfate in body fluid kynurenate in body fluid kynurenin in body fluid L-dopa decarboxylase in CSF L-dopa decarboxylase in plasma lactase in small intestine lactoferrin measurement lactose tolerance test lanosterol in serum/plasma lathosterol in serum/plasma laurate measurement lauroleate (C12:1) in specimen LDL cholesterol direct (LDL direct) in serum LDL in serum/plasma LDL triglycerides in serum/plasma lecithin cholesterol acyltransferase (LCAT) in serum/plasma lecithin in specimen leptin in serum/plasma leucine-enkephalin in serum/plasma leukocyte elastase in plasma leukocyte esterase measurement levulinate in specimen linoleate in specimen lipids in body fluid lipoprotein cholesterol in serum; Lp(a)-cholesterol in serum lipoprotein in serum lipoprotein alpha in body fluid lipoprotein beta in body fluid lipoprotein beta size in serum/plasma lipoprotein fractionation lipoprotein in serum/plasma lipoprotein lipase in serum/plasma lipoprotein pre-beta in body fluid lipoprotein small beta in serum/plasma lipoprotein X in serum/plasma lithocolate in serum/plasma lutein in serum/plasma luteinizing hormone releasing hormone (LHRH) in serum/plasma lycopene in plasma lysolecithin acyltransferase in erythrocytes lysophosphatidylcholine in specimen lysosomal acid lipase in specimen lysosomal enzymes in body fluid lysozyme in body fluid (serum/plasma/urine/CSF) macrophage migration inhibitory factor in serum/plasma macroprolactin in serum/plasma malate dehydrogenase in serum malate in specimen malonate in body fluid mandelate in body fluid manganese in specimen mannitol in body fluid mannose-6-phosphate isomerase measurement mannose-binding protein in serum matrix metallopeptidase 2 in serum matrix metallopeptidase 9 in body fluid mead acid (C20:3w9) in specimen medium-chain acyl CoA dehydrogenase measurement melanin in body fluid melanoma inhibitory activity protein in serum/plasma melatonin in body fluid menadione in serum/plasma meropenem in serum/plasma mesoporphyrin in stool mesothelin related proteins in serum/plasma metanephrine in serum/plasma metanephrines in serum/plasma methane measurement methemalbumin in serum/plasma methionine adenosyltransferase in serum methionine sulfoxide in body fluid methionine synthase in serum methyl tert-butyl ether measurement methylenetetrahydrofolate dehydrogenase NAD in serum methylenetetrahydrofolate dehydrogenase NADP in serum methylmalonate in body fluid methylmalonyl CoA mutase in serum methylsuccinate in body fluid metyrapone stimulation test microtubule-associated protein tau in body fluid mitochondrial respiratory chain enzymes in fibroblasts molybdenum in specimen monoamine oxidase in blood/plasma monounsaturated fatty acids in serum/plasma motilin in serum/plasma mucin-like carcinoma associated Ag in body fluid mucoprotein in serum mucus in body fluid Mullerian inhibiting substance in serum/plasma (PicoAMH Elisa) myelin basic protein (MBP) in body fluid myelin basic protein antigen myeloperoxidase in serum/plasma myoglobin in body fluid myristate in specimen myristoleate in specimen N,N'-dimethylarginine in specimen N-acetyl-beta-glucosaminidase in body fluid N-acetylaspartate in body fluid N-acetylaspartylglutamate in CSF N-acetylgalactosamine-4-sulfatase measurement N-acetylgalactosamine-6-sulfatase in cells/tissue N-acetylglucosamine-6-sulfatase in cells/tissue/serum N-acetyltyrosine in specimen N-methylarginine in specimen NADH cytochrome C reductase in tissue; ubiquinol cytochrome C reductase in tissue NADH dehydrogenase measurement NADH methemoglobin reductase in erythrocytes NADH:ubiquinone reductase in specimen naphthalene measurement; naphthalene in specimen neopterin in body fluid nervonate in specimen neurofilament light chain in body fluid neuronal thread protein in CSF (AD7C test) Neuropeptide Y in serum neurophysin in serum/plasma neurotensin in plasma neutrophil gelatinase-associated lipocalin in specimen niacin in body fluid nicotinamide in body fluid nitrite in specimen nitroblue tetrazolium test nitrogen measurement nitrogen non-protein in serum/plasma/blood non prostatic acid phosphatase in serum (serum PAP) northern blot octadecanoate (stearate) in specimen octadecatetraenoate (stearidonate) in specimen octanoate (caprylate) in specimen OKT3 in serum/plasma oleate measurement oligosaccharides in specimen omega-3 fatty acids measurement omega-6 fatty acids in serum/plasma organic acids in body fluid ornithine carbamoyltransferase in tissue orotate in body fluid orotate phosphoribosyltransferase in serum orotidine in body fluid orotidine-5'-phosphate decarboxylase in serum; OMP decarboxylase in serum osteocalcin in serum osteonectin in plasma oxalate in measurement oxytocin in body fluid palatinase (sucrase-isomaltase) in tissue palmitate measurement palmitoleate in specimen palmitoyl protein thioesterase in specimen palmitoylphosphatidyl choline in plasma pancreastatin in serum/plasma pancreatic elastase in body fluid pancreatic polypeptide in plasma pancreatic stone protein in serum/plasma pantothenate in body fluid para-aminohippurate in urine para-aminohippurate renal clearance paraoxonase-arylesterase 1 (PON1) in serum parathyroid hormone (parathyrin) in serum/plasma parathyroid hormone in specimen parathyroid hormone related peptide in plasma pentacarboxylate in body fluid pentacarboxylporphyrin measurement pentagastrin stimulation test (calcitonin-stimulation test) pepsin in body fluid pepsinogen in body fluid peptide histidine isoleucine in plasma peptide YY in serum/plasma perforin in leukocytes peripheral deiodinase activity in serum/plasma phenylacetate in body fluid phenylalanine/tyrosine in body fluid phenyllactate in body fluid phenylpyruvate in body fluid phophoribosylpyrophosphate synthetase in specimen phosgene in air phosphatidylglycerol in amniotic fluid phosphatidylinositol in serum phosphoenolpyruvate carboxykinase in serum phosphoethanolamine in body fluid phosphofructokinase F subunit/phosphofructokinase total in tissue phosphofructokinase measurement phosphoglucomutase in serum phosphoglycerate kinase measurement phosphoglycerate mutase measurement phosphohexose isomerase in erythrocytes phosphomannomutase 1 in specimen phosphomannomutase 2 in fibroblasts phosphorylase in erythrocytes phosphorylase in serum phosphorylase kinase in erythrocytes phosphoserine in body fluid phytanoyl CoA hydroxlase in fibroblasts phytate in serum/plasma pipecolate in body fluid placental growth factor in serum plasma soluble urokinase plasminogen activator receptor polymerase chain reaction (PCR) polyunsaturated fatty acids in serum/plasma porphobilin in serum porphobilinogen deaminase in blood porphobilinogen deaminase in erythrocytes porphobilinogen synthase (delta-aminolevulinic acid dehydratase) measurement post-heparin lipolytic activity pregnancy associated plasma protein-A (PAPP-A) in serum/plasma pregnancy-specific protein 1 in serum pregnanediol in body fluid pregnenolone in body fluid preimplantation genetic diagnosis (PGD) procalcitonin in serum (Vidas Brahms PCT Assay) procollagen type 1 in serum procollagen type 3 in serum procollagen+collagen in fibroblasts progesterone challenge test progesterone in body fluid proinsulin in serum/plasma prolactin in body fluid proline dipeptidase (peptidase D) in tissue promyelocytic leukemia protein distribution pattern properdin factor B in body fluid propionate in serum propionyl CoA Carboxylase measurement propranolol in body fluid prorenin in plasma prostaglandin in body fluid prostate specific antigen (PSA) in specimen protein 14-3-3 in cerebrospinal fluid protein carbonyl in specimen (OxyBlot assay) protein kinase in serum protein misfolding cyclic amplification (PMCA) protein phosphatase 3 (calcineurin) in leukocytes proteinase 3 (leukocyte elastase) in serum proteomic analysis (proteomics) pseudocholinesterase phenotype in serum/plasma pseudouridine in specimen purine nucleoside phosphorylase measurement purine/pyrimidine ratio in erythrocytes pyridoxine congeners in serum/plasma pyrophosphate crystals in body fluid pyruvate carboxylase measurement pyruvate dehydrogenase cytochrome in serum/plasma pyruvate dehydrogenase lipoamide in tissue pyruvate dehydrogenase measurement pyruvate in body fluid pyruvate kinase measurement pyruvate oxidase in serum/plasma quinolinate in body fluid recombinant immunoblot assay (RIBA) remnant lipoprotein in serum/plasma renin activity in renal vein renin in plasma resistin in serum/plasma restriction fragment length polymorphism (RFLP) reticulin in serum retinaldehyde in tissue retinoate (tretinoin) in serum/plasma retinoate ester in serum/plasma retinol ester in serum/plasma retinol in specimen; retinol measurement retinyl palmitate in serum/plasma reverse triiodothyronine (T3) in serum/plasma riboflavin in body fluid ribonuclease in serum ribose in body fluid ribose-5-phosphate isomerase measurement ribulose in serum S-adenosylhomocysteine in body fluid S-adenosylmethionine in body fluid S100-beta in body fluid S100A8/A9 in serum (calprotectin in serum) Saccharomyces cerevisiae IgG/AgA in serum saccharopine in specimen sarcosine in body fluid sebacate in body fluid secretin in plasma secretin stimulation test semen analysis sepiapterin in body fluid serine-pyruvate (alanine-glyoxylate) aminotransferase in tissue serotonin in specimen; serotonin measurement sialate (sialic acid) in body fluid silicon in specimen; silicon measurement somatostatin in serum/plasma somatotropin-releasing hormone in serum/plasma southern blot sphingomyelinase measurement squalene in serum/plasma squamous cell carcinoma antigen in body fluid stercobilin in stool stigmastanol in serum/plasma stigmasterol in serum/plasma stone analysis stool osmolality sTREM2 in CSF suberate in body fluid substance P in body fluid succinate cytochrome C reductase in specimen succinate dehydrogenase in tissue succinate semialdehyde dehydrogenase in leukocytes succinylacetone in body fluid succinylaminoimidazole carboxamide riboside (SAICAR) in body fluid sucrase in tissue sucrose in specimen sugars in serum/plasma/urine sulfate in specimen sulfite oxidase in plasma superoxide dismutase in tissue surfactant in amniotic fluid surfactant pulmonary-associated protein D in serum test for tumor antigen testosterone in body fluid tetradecadienoate in specimen tetrahydrobiopterin in CSF tetrahydrofolate in body fluid thiamine in body fluid thiamine pyrophosphate in body fluid thioguanine in specimen thiopurine methyltransferase measurement thromboxane A2 in serum thromboxane B2 in body fluid thymidine in body fluid thymidine kinase in serum thymidine phosphorylase measurement thymine in body fluid thymosin alpha in serum thyroglobulin measurement thyroglobulin recovery in serum/plasma thyroid stimulating hormone (TSH) beta in serum thyroid-stimulating hormone (TSH) in body fluid; thyrotropin in body fluid thyrotropin-releasing hormone in body fluid tissue inhibitor of metalloproteinases 1 in serum/plasma tissue polypeptide antigen in serum/plasma TNF receptor 1A in serum/plasma tocopherol in specimen tolbutamide tolerance test transaldolase measurement transcobalamin in serum transcortin (corticosteroid-binding globulin) in CSF/serum transferrin in specimen transferrin receptor in serum transferrin saturation in serum/plasma transforming growth factor alpha (TGF-alpha) antigen in tissue transforming growth factor beta 1 (TGF-beta1) in serum/plasma transketolase in blood/serum transthyretin (prealbumin) in body fluid TRH stimulation test triglyceride + ester in IDL in serum/plasma triglyceride + ester in LDL in serum/plasma triglyceride + ester in VLDL in serum/plasma triiodothyronine in body fluid trimethyllysine in specimen triokinase in plasma triosephosphate isomerase measurement tripeptide aminopeptidase in serum/plasma tripeptidyl peptidase 1 measurement; tripeptidyl peptidase 1 in specimen trypsin & chymotrypsin in stool trypsin in body fluid trypsinogen in blood trypsinogen in body fluid tryptamine in serum/plasma tryptase in body fluid tryptase.mature in serum/plasma tumor necrosis factor (TNF) alpha in body fluid tumor necrosis factor (TNF) binding protein in serum tyrosine aminotransferase in plasma ubiquinone 10 measurement ubiquitin C-terminal hydrolase in blood UDP-glucose 4-epimerase in erythrocytes UDP-glucuronosyltransferase-1A in blood/tissue uracil in body fluid uridine diphosphate glucose-4-epimerase in plasma uridine in body fluid uridine monophosphate synthetase in erythrocytes uridyl transferase measurement urobilin in body fluid urobilinogen in body fluid uroporphyrin measurement uroporphyrinogen decarboxylase measurement uroporphyrinogen I synthase measurement uroporphyrinogen III synthase measurement ursodeoxycholate in serum vanillate in body fluid vanillylmandelate in body fluid vascular cell adhesion molecule 1 in serum/plasma vasoactive intestinal peptide (VIP) in body fluid vasopressin in body fluid very long chain fatty acids in specimen vinyl chloride measurement vitamin B12 binding capacity vitamin B12 unsaturated binding capacity vitamin B12/folate measurement vitamin B6 measurement vitamin D in serum vitamin D+metabolites in serum/plasma vitamin in serum/plasma vitamin K (phytonadione) in serum/plasma vitronectin in serum/plasma western blot xanthine measurement zinc (Zn+2) measurement