What is the normal range for urine specific gravity?

What is the normal range for urine specific gravity?

• A. 1.002 to 1.035
• B. 1.000 to 1.010
• C. 0.990 to 1.000
• D. 1.010 to 1.020

Answer: (A)

Urine specific gravity shows how concentrated or dilute urine is, reflecting hydration status and kidney concentrating ability. In healthy people, this value varies with fluid intake and physiological conditions, so the normal range needs to cover both ends of that variation. Very dilute urine can have a SG around 1.002, while highly concentrated urine can approach about 1.035. Therefore, a range that spans from 1.002 up to 1.035 best fits the typical variability seen in normal, healthy individuals. Other ranges either dip into values that are essentially pure water (which isn’t normal for urine) or are too narrow to accommodate the full spectrum of normal concentration seen in everyday measurements. Keep in mind that labs may report slightly different reference ranges, but the concept remains the same: urine SG reflects hydration and kidney function, and a broad range like 1.002 to 1.035 captures that physiologic variability.

Urine specific gravity shows how concentrated or dilute urine is, reflecting hydration status and kidney concentrating ability. In healthy people, this value varies with fluid intake and physiological conditions, so the normal range needs to cover both ends of that variation. Very dilute urine can have a SG around 1.002, while highly concentrated urine can approach about 1.035. Therefore, a range that spans from 1.002 up to 1.035 best fits the typical variability seen in normal, healthy individuals.

Other ranges either dip into values that are essentially pure water (which isn’t normal for urine) or are too narrow to accommodate the full spectrum of normal concentration seen in everyday measurements. Keep in mind that labs may report slightly different reference ranges, but the concept remains the same: urine SG reflects hydration and kidney function, and a broad range like 1.002 to 1.035 captures that physiologic variability.