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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