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Progesterone Total and Free

Test ID: 


CPT code:

84144, 84999

Clinical Use:

Progesterone plays an important role in the secretory transformation of the endometrium, maintenance of gestation, and relaxation of the myometrium. Progesterone is also a marker for ovulation and luteal phase of the menstrual cycle. Steroid hormones (like progesterone) circulate in the blood in protein-bound and free forms, and it is the free form that exhibits biological activity. The free form of progesterone is expected to reflect the biological activity of progesterone.

Specimen Type:

Serum (preferred) or plasma

Requested Volume: 

0.8 mL

Minimum Volume: 

1.6 mL

Container Type: 

Red-top tube, gel-barrier tube, lavender-top (EDTA) tube, or green-top (sodium heparin) tube


To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Storage Instructions:

Freeze (preferred) or refrigerate.

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