What Is Urine Specific Gravity?

The specific gravity of urine refers to the weight ratio of urine to the same volume of pure water at 4 ° C. It depends on the concentration of dissolved substances in urine and is directly proportional to the total solids.

Basic Information

Chinese name: Urine specific gravity
Foreign name: Specific gravity
expression: Ratio of weight to water of the same volume at 4 degrees Celsius

Scope of application: Medical
Normal value range: Adult: 1.015 ~ 1.025
Inspection Method: Test strip method, refractometer method, weighing method

Clinical significance of urine specific gravity

The specific gravity of urine is related to the amount of drinking water and the urine value at that time, which mainly depends on the concentration function of the kidneys. In the case of drainage metabolic disorders:

Increased urine specific gravity

It can be seen in acute glomerulonephritis, heart failure, high fever, dehydration, diabetes, diabetic ketosis, pregnancy poisoning, etc. It can also be seen when urine contains glucose and iodine contrast agent.

2. Decreased urine specific gravity

Uremia, shock, hepatorenal syndrome, diabetes insipidus, neuropolyuria, tubular injury, chronic glomerulonephritis, pyelonephritis, renal failure, etc.