Osmolality blood test
Osmolality is a test that measures the concentration of all chemical particles found in the fluid part of blood.
Osmolality can also be measured with a urine test.
Chernecky CC, Berger BJ. Osmolality - serum. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. St Louis, MO: Elsevier Saunders; 2013:832-833.
Verbalis JG. Disorders of water balance. In: Skorecki K, Chertow GM, Marsden PA, Taal MW, Yu ASL, eds. Brenner and Rector's The Kidney. 10th ed. Philadelphia, PA: Elsevier; 2016:chap 16.