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SPECIFIC GRAVITY, URINE
Test CodeLAB5787
Alias/See Also
SG
CPT Codes
81002
Preferred Specimen
Random urine
Minimum Volume
4.0 mL
Instructions
Mid-stream clean catch preferred to minimize contaminants
Transport Container
Sterile container
Transport Temperature
Refrigerated
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Frozen
Methodology
Reagent Strip Automated
Setup Schedule
Set Up:Daily Report Available: Routine 4 ours/ STAT 1 hour
Reference Range
Specific Gravity: 1.003-1.026
Clinical Significance
The urine concentration test shows changes early in chronic renal disease. Diabetes insipidus, characterized by abnormal function of antidiuretic hormone (ADH), presents a relatively dilute urine despite the need to conserve water. Low specific gravity may also occur in patients with glomerulonephritis, pyelonephritis, and various renal anomalies. Specific gravity is high in patients with diabetes mellitus, adrenal insufficiency, hepatic disease, congestive cardiac failure; and when there has been excessive loss of water, as with sweating, fever, vomiting and diarrhea. High amounts of glucose and protein increase the specific gravity of urine by .004 and .003 for each 1% of the respective constituents.
Performing Laboratory
GBMC Hematology
