What it measures
Progesterone is a hormone made by the ovary after an egg is released, and by the placenta in pregnancy. A rise in the second half of the menstrual cycle shows that ovulation has happened. The test measures how much is in the blood.
Why people test it
- Used to check whether ovulation has happened, often when trying to conceive.
- Measured when periods are irregular or fertility is being looked into.
- Checked by some clinics in early pregnancy, for example after bleeding.
Typical range
Ranges vary by lab and method, and the result depends on the day of the cycle the sample was taken. Your report shows the lab's own range.
Finger-prick or vein?
A vein sample is usually advised. Finger-prick results can be raised by creams or gels on the fingers, including progesterone creams.
Timing matters for this test. To check ovulation it is usually taken about 7 days before a period is due, which is day 21 of a 28-day cycle.