Urine tests | eClinpath

Fractional excretion of analytes

Fractional excretion = [(urinary analyte/serum analyte) x (serum creatinine/urine creatinine)] x 100

concentration of analyte in urine (units)*

concentration of analyte in serum (units)*

serum creatinine (units)*

urine creatinine (units)*

Fractional excretion (%)

*Units: any unit may be used (e.g. mg/dL, mmol/L) but the calculation is only valid if the same unit is used consistently for each field.