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Serum Osmolality

What Affects the Test

You may not be able to have the test, or the results may not be helpful, if:

  • You drink alcohol right before the test.
  • You have recently had a blood transfusion.

What To Think About

  • The concentration of chemicals in your urine (urine osmolality) may be measured and compared to your serum osmolality. This can help your doctor see how well the kidneys are working and find what's causing an imbalance of water and electrolytes in your body.
  • Sometimes the level of antidiuretic hormone (ADH) increases even though the amount of chemicals in the blood is normal. This is called syndrome of inappropriate antidiuretic hormone secretion (SIADH). Serum osmolality can check for SIADH.

Citations

  1. Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.

Other Works Consulted

  • Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis: Saunders.

  • Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.

ByHealthwise Staff
Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine
Specialist Medical ReviewerAlan C. Dalkin, MD - Endocrinology

Current as ofNovember 14, 2014

1 | 2 | 3

WebMD Medical Reference from Healthwise

Last Updated: November 14, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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