A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

Osmolality, serum

Test Code
OSMO


Preferred Specimen
1.0 mL serum (0.5 mL minimum)


Transport Container
SST or no additive (red-top)


Specimen Stability
Room temperature: 3 hours; Refrigerated: 3 days; Frozen: 1 week


Reference Range
280-295 mOsm/kg H2O


Clinical Significance
Osmolality determinations are helpful in the clinical management of water and electrolyte disturbances. Serum osmolality studies are useful in the evaluation of hypernatremia and hyponatremia, renal solute retention in acute renal failure and hydration status.




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.