$7.00
Priced per marker, with baseline labs included. You’ll see your total before you pay.
Hormones & reproductive
Progesterone test
P4. May point to ovulation and supports luteal phase; can rise in second half of cycle and pregnancy.
At a glance
In about 5 days
Most results are ready in about 5 days. Some specialty markers can take up to 21 days.
Best at a set time of day or cycle day
Contact us before your draw if you’re not sure.
Walk in at Quest
Your lab order arrives by email. Most Quest locations take walk-ins, so bring it with a photo ID.
What it measures
Progesterone can rise after you ovulate (release an egg) to get the lining of your uterus ready for pregnancy. Checking it about a week before your period is due can help show whether you ovulated that cycle.
Why it matters for women
Progesterone can help show whether you’re ovulating when you’re trying to conceive or your periods are irregular. Because it can change so much across your cycle, the day you test matters. In early pregnancy, doctors sometimes check it along with hCG, the pregnancy hormone.
You might check it if…
- you’re trying to get pregnant
- your periods are irregular and you’re not sure you ovulate
- a doctor wants to check ovulation in a specific cycle
- you’re in early pregnancy and a doctor wants to check it
What your result may mean
High Progesterone: what it may mean
High progesterone in the second half of your cycle (the luteal phase) may mean you ovulated. It can also point to pregnancy, when the level can keep climbing. Outside those settings, it may suggest ovarian or adrenal hyperplasia, such as congenital adrenal hyperplasia, or it can come from progesterone medicine used during fertility treatment. Breast tenderness, bloating or mood changes may appear in the days before a period. The day you test can sway the result, so your cycle dates can help a clinician read it.
Low Progesterone: what it may mean
Low progesterone about a week before your period is due may suggest a cycle without ovulation (anovulation) or a luteal-phase defect, when the second half of the cycle may not support the uterine lining well. It can be normal in the first half of your cycle, after menopause and on hormonal birth control. In early pregnancy, a low level can be linked to a higher chance of miscarriage, and a clinician may check it with hCG. PCOS, thyroid problems, high prolactin and perimenopause can all disrupt ovulation. Irregular periods, spotting before your period or trouble getting pregnant may be what you notice.
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These notes provide context and do not diagnose a condition. Not yet available in NY, NJ, RI, HI, ND, SD or WV.