The normal value of progesterone at four weeks should be 4.73 to 50.74 ng/ml.
Progesterone is a hormone necessary for the maintenance of pregnancy, during pregnancy progesterone mainly acts on the corpus luteum, regulates the synthesis of prostaglandins in this tissue, and also promotes the development of mammary gland follicles and ducts to prepare for lactation, so it is very important that the progesterone is at a normal value during pregnancy.
The normal value of progesterone is different in each period, for example, the normal value of the first trimester of pregnancy should be 4.73-50.74ng/ml, and the fourth to sixth months should be 19.41-45.3ng/ml. four weeks of pregnancy belongs to the first trimester, so four weeks of progesterone at 4.73-50.74ng/ml is normal.
If you have high or low progesterone during pregnancy, it may be due to certain diseases, and you need to find out the cause and take standardized treatment.