A rough estimate of the amount of solutes in the urine can be made from the specific gravity of the urine.
solute factor =
= ((specific gravity) – 1.000) * 1000
dry weight of solute in grams per liter =
= (solute factor) * (age factor)
dry weight of solute in grams per 24 hours =
= (dry weight of solute in grams per liter) * (liters of urine per 24 hours)
• age factor = 2.6 for adults, 1.6 for small children
• The solute factor represents the second and third decimal places to the right of the decimal place.
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Specialty: Nephrology, Clinical Laboratory