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Specific Gravity, Urine

Test Code
USPG


Alias/See Also
SG Urine


Preferred Specimen
1 mL urine (0.5 mL minimum)


Instructions
Submit freshly voided specimen to Laboratory within 2 hours of collection (or store refrigerated until sent).


Transport Container
Urine collection cup


Specimen Stability
Room temperature: 2 hours, Refrigerated: 12 hours, Frozen: unacceptable


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Specimens >2 hrs old are unacceptable.


Limitations
Radiographic dyes in urine increase specific gravity.


Reference Range
1.005-1.030


Clinical Significance
Considerable variation in the specific gravity of random specimens is seen over a 24-hour period. Early morning samples are usually the most concentrated. The inability to concentrate or dilute urine is an indication of renal disease or hormonal deficiency (ADH).




The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.