Nephrology Book

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Fractional Excretion of Potassium

Aka: Fractional Excretion of Potassium, FEK
  1. See Also
    1. Potassium Homeostasis
    2. Serum Potassium
    3. Urine Potassium
    4. Hyperkalemia
    5. Hypokalemia
  2. Indications
    1. Hyperkalemia
  3. Precautions
    1. Results altered by Hyperkalemia Management
    2. Obtain lab sample prior to intervention if possible
      1. Do not delay treatment in emergent Hyperkalemia
  4. Labs
    1. Serum Potassium and Serum Creatinine
    2. Spot urine for Urine Potassium and Urine Creatinine
  5. Formula
    1. FEK = (Potassium Excretion x 100)/(total filtered load)
      1. Potassium (K+) Excretion = (Urine K++) / (Serum K++)
      2. Total Load = (Urine Creatinine) / (Serum Creatinine)
    2. FEK = (uK x sCr x 100) / (sK x uCr)
  6. Interpretation of Fractional Excretion of Potassium
    1. FEK <10%: Renal cause of Hyperkalemia
    2. FEK >10%: Extrarenal cause of Hyperkalemia
      1. May also be increased in Chronic Renal Failure

Measurement of fractional excretion of potassium (C1384695)

Concepts Diagnostic Procedure (T060)
SnomedCT 409082001
English Measurement of fractional excretion of potassium (procedure), Measurement of fractional excretion of potassium
Spanish determinación de la excreción fraccional de potasio (procedimiento), determinación de la excreción fraccional de potasio
Sources
Derived from the NIH UMLS (Unified Medical Language System)


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