The correction of urine specific gravity for protein is to subtract 0.003 for each 1 g/dL of protein from the temperature-corrected specific gravity.
Measurement of specific gravity: refractometer
correction factor for protein =
= (urine protein in g/dL) * 0.003
corrected urine specific gravity =
= (urine specific gravity corrected for temperature) - (correction factor for protein)
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Specialty: Nephrology, Clinical Laboratory