A progesterone level of 2.9 nmol/L in non-pregnant or menopausal women is generally normal. However, if 2.9nmol/L in the pregnant state, it generally suggests that the progesterone level is low and the patient is at risk of miscarriage. The normal value of progesterone is different in different periods, in the case of non-pregnancy, the progesterone follicular phase is about 0.64-4.77nmol/L, in the ovulation phase is about 2.54-9.54nmol/L, the luteal phase can reach 5.41-85.9nmol/L, and if it has been menopausal, it is about 0.32-2.54nmol/L. In the first trimester of pregnancy, it can be about 3 months, and in the first trimester of pregnancy, it can be about 3 months, and in the first trimester of pregnancy, it can be about 3 months. Progesterone can be >15nmol/L in the first trimester and higher in the middle and late trimesters. So progesterone 2.9nmol / L if in the pregnancy suggests abnormal, there is a risk of miscarriage, it is recommended to actively seek medical attention. In other periods, if there is no relevant clinical manifestations, it is generally normal.