The "cycle day 21" progesterone test should really not be called that. It should be called the "7 days past ovulation" test because it needs to be done 7 days AFTER ovulation. The doctors use a textbook average 28 days cycle to come up with "day 21" test, but not all women have a 28 day cycle and the timing of this test is important.
After ovulation, progesterone production ramps up and levels begin to surge. They peak and then plateau at about day 7 after ovulation, which is when they do the test - when progesterone is about at its highest level.
The test measures progesterone and if its above a certain level it will confirm that you ovulated and that you had enough progesterone in your system to get pregnant and stay pregnant, so its a really important test.
Here are the measurements:
<10 nmol/l = no ovulation>
10-30nmol/l = ovulation occured but not enough progesterone to get/stay pregnant
>30 nmol/l - a normal, healthy level
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