Educational information only. At Precursor, hormone testing is requested and reviewed by a clinician and considered alongside your history and other markers, not as a stand-alone diagnosis. Testing is performed in NATA-accredited laboratories to ISO 15189 standards.

What is progesterone?

Progesterone is a sex hormone central to the menstrual cycle and to pregnancy. After ovulation it rises to prepare the body for a possible pregnancy, then falls if none occurs. This rise and fall makes it a useful marker of ovulation and cycle health.

Why it matters

Progesterone is often measured to confirm whether and when ovulation has occurred, which is valuable in understanding cycle patterns and fertility. Because its level swings so much across the cycle, the day of testing is critical to interpretation.

What your results can mean

Lower than expected

A low progesterone at the point in the cycle where it should be high can suggest ovulation did not occur that cycle, though a single reading is only a snapshot and is read in context.

Higher than expected

A rise in progesterone in the second half of the cycle is the expected pattern and generally indicates ovulation has taken place.

Reference ranges in Australia

Progesterone is reported in nanomoles per litre (nmol/L), and the expected value depends heavily on where you are in your menstrual cycle, as well as pregnancy. For this reason it is usually tested on a specific cycle day. Read your result against your own report and with a clinician.

Understanding your hormones with Precursor

Progesterone must be read against your cycle timing to mean anything. At Precursor, hormone testing is requested and reviewed by a clinician, so it is timed and interpreted correctly. If this is something you would like to understand, you can speak with Precursor's clinical team about whether testing is right for you.