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Progesterone

(continued)

What Affects the Test

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

The use of hormones, including those containing estrogen or progesterone (such as birth control pills).
The use of medicines, such as ampicillin and clomiphene.
The time of day when you have the test. Progesterone levels normally fluctuate during the day.
Exercise.
Having a test such as a thyroid scan or bone scan that used a radioactive substance (tracer) within 1 week before the progesterone test.
Where you are in your menstrual cycle.

What To Think About

Levels of progesterone are higher during a multiple pregnancy (such as twins or triplets) than during a single pregnancy (only one fetus).
Progesterone levels vary widely throughout the menstrual cycle. So it is important for your doctor to know the first day of your last menstrual period.

Citations
Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis: Saunders.
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.

By	Healthwise Staff
Primary Medical Reviewer	Sarah Marshall, MD - Family Medicine
Specialist Medical Reviewer	Femi Olatunbosun, MB, FRCSC - Obstetrics and Gynecology
Last Revised	May 18, 2011

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WebMD Medical Reference from Healthwise

Last Updated: May 18, 2011

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.