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    Sedimentation Rate (Sed Rate)

    What Affects the Test

    Reasons you may not be able to have the test or why the results may not be helpful include:

    • Pregnancy.
    • Anemia.
    • Having your menstrual period.
    • Medicines. Many medicines can change the results of this test. Be sure to tell your doctor about all the nonprescription and prescription medicines you take.

    What To Think About

    • Even though some problems, such as giant cell arteritis, almost always cause a high sedimentation rate (sed rate), the test can't be used by itself to identify a specific disease. Results of a sed rate test are considered along with your symptoms, other test results, and medical information.
    • Some diseases that cause inflammation do not increase the sed rate, so a normal sed rate does not always rule out a disease.
    • Some doctors use the C-reactive protein (CRP) blood test instead of the sed rate test to help identify inflammatory conditions. To learn more, see the topic C-Reactive Protein (CRP).

    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

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

    • Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby Elsevier.

    ByHealthwise Staff
    Primary Medical ReviewerAnne C. Poinier, MD - Internal Medicine
    Specialist Medical ReviewerKathleen Romito, MD - Family Medicine

    Current as ofSeptember 9, 2014

    1 | 2 | 3

    WebMD Medical Reference from Healthwise

    Last Updated: September 09, 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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