Osmolality

Test ID:

703059

CPT code:

83930

Clinical Use:

Evaluate electrolyte and water balance, hyperosmolar status, and hydration status; evaluate dehydration, acid-base balance; evaluate seizures; clue to alcoholism, methanol toxicity, ethylene glycol ingestion; evaluate antidiuretic hormone function, liver disease, hyperosmolar coma, evaluate hypernatremia. Osmolarity measures the concentration of particles in solution.

Specimen Type:

Serum or plasma

Requested Volume:

2 mL

Minimum Volume:

0.2 mL

Container Type:

Red-top tube, gel-barrier tube, or green-top (heparin) tube.

Collection:

Pediatric: Blood drawn from heelstick for capillary. Separate serum or plasma from cells as soon as possible after clot formation. Transfer specimen to a plastic transport tube.