Progesterone Total and Free
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.
Serum (preferred) or plasma
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.
Freeze (preferred) or refrigerate.