The correction of urine specific gravity for glucose involves subtracting 0.004 for each 1 g/dL of glucose from the temperature-corrected specific gravity.
Measurement of specific gravity: refractometer
correction factor for glucose =
= (urine glucose in g/dL) * 0.004
corrected urine specific gravity =
= (urine specific gravity corrected for temperature) - (correction factor for glucose)
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