Progesterone 20ng/ml requires fertility preservation treatment if there are special circumstances such as preeclampsia, assisted reproductive technology, etc. If there are no other special circumstances, there is no need for fertility preservation treatment. Progesterone is released intermittently, the value of progesterone measured by blood sampling is the instantaneous value of progesterone in the body, which can not reflect the average total amount of progesterone in the blood, and generally the serum progesterone reaches 20-30ng/ml in early pregnancy is enough; for women who are worried about anxiety during pregnancy, and for women who are combined with aura miscarriage, assisted reproductive technology and recurrent miscarriage, they can take preventive supplementation of progesterone to preserve the fetus. At present, it is believed that there is no need to routinely check progesterone in early pregnancy, and there is no need to review the test when there is no abdominal pain, vaginal bleeding and other conditions of preeclampsia, and progesterone does not reflect the outcome of pregnancy. There is no need to panic when low progesterone is detected, consult your obstetrician for an evaluation to determine if fertility preservation treatment is needed.