Progesterone of 0.2nmol/L has different significance at different stages such as follicular phase, luteal phase, and post-pregnancy, etc. If progesterone of 0.2nmol/L is relatively low during the luteal phase and gestation, it can be supplemented with oral dextroprogesterone.
The normal range of progesterone in the follicular phase is <3.2nmol/L, the range of progesterone in the luteal phase is 9.5-89nmol/L, and the range of progesterone in the gestational phase is >63.6nmol/L. Therefore, progesterone of 0.2nmol/L does not need to be treated in the follicular phase, but if it is in the luteal phase or in the gestational phase, it needs to be supplemented with a progestin, such as dexprogesterone, to treat it.
Therefore, women who find that their progesterone is low should actively go to the hospital for treatment, if the low progesterone may affect the menstrual cycle or affect conception and pregnancy.