Specific Gravity, Random, Urine

Casandra

Casandra Test Code MC11720Version 1 (DRAFT)

Performing Lab

Lab Mayo Clinic LabLab Test ID SGURCPT Code 81005

Specific Gravity, Random, Urine

Clinical Use

Use

Specific Gravity (SG) is an estimate of the concentration of substances dissolved in urine and can be used as a partial assessment of the kidney's ability to concentrate or dilute urine. However, substances like protein, glucose, and contrast agents disproportionately influence SG; in such cases, urine osmolality is a better measure of urine concentration. Normal interval: 1.002–1.030. Low SG may indicate diseases such as diabetes insipidus, glomerulonephritis, or pyelonephritis. High SG may occur with adrenal insufficiency, hepatic disease, congestive heart failure, or dehydration. ([mayocliniclabs.com](https://www.mayocliniclabs.com/test-catalog/overview/606565?utm_source=openai))

Special Instructions

Specimen: random urine; container: plastic urine container; volume: 20 mL preferred, minimum 1 mL; no preservative; transport refrigerated (preferred) or frozen, stable up to 7 days. If ordering non‑electronically, complete Renal Diagnostics Test Request (T830). Collect a random urine specimen. Urine samples with contrast dye, glucose, or excessive protein should not be evaluated with this test; in those cases, order UOSMU (Osmolality, Random, Urine). ([mayocliniclabs.com](https://www.mayocliniclabs.com/test-catalog/overview/606565?utm_source=openai))

Limitations

Substances such as protein, glucose, or contrast dye can disproportionately affect specific gravity measurement and may lead to misleading results; in such situations, urine osmolality is the preferred method. No significant cautionary statements noted otherwise. ([mayocliniclabs.com](https://www.mayocliniclabs.com/test-catalog/overview/606565?utm_source=openai))

Test Details

FDA Approved