Progesterone - serum
Progesterone levels vary depending on when the test is done. Blood progesterone levels start to rise midway through the menstrual cycle, continue to rise for about 6 to 10 days, and then fall if fertilization does not result.
Levels continue to rise in early pregnancy.
This following are normal ranges based upon certain phases of the menstrual cycle and pregnancy:
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Source: ADAM Encyclopedia
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Source: Breastcancer.org
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