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fractional excretion of phosphorus

Defined as: excreted phosphorus/filtered phosphorus Indications: - evaluation of hypophosphatemia Procedure: Measured as: (urine phosphorus/serum phosphorus) / (urine creatinine/serum creatinine) Clinical significance: - useful for renal phosphate wasting i.e. Fanconi syndrome, RTA-2 vs extrarenal cause of hypophosphatemia - fractional excretion of phosphorus > 5% is consistent with renal phosphate wasting (RTA type 2)

Related

hypophosphatemia

General

urinary indices

References

  1. Medical Knowledge Self Assessment Program (MKSAP) 16 American College of Physicians, Philadelphia 2012