Sign in →

Test Code FSG Specific Gravity, Body Fluid, LAB199

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Fluid, uncentrifuged and without anticoagulation.

Specimen Volume: 0.1 mL of body fluid.

Stability: Specimens should be at room temperature for testing.

Note: Indicate specimen source on specimen container and in computer.

Reference Values

Fluid transudate <1.015

Fluid exudate >1.015

Day(s) Test Set Up

Monday through Sunday



Test Classification and CPT Coding


Useful For

Fluid specific gravity determinations are used in the categorization of the fluid as a transudate or an exudate.

Analytic Time

1 hour upon receipt.