PROG is the abbreviation for progesterone, also known as luteinizing hormone, which is the main biologically active progestin secreted by the ovary. PROG is the abbreviation for progesterone, which is generally replaced by P or PROG for simplicity in clinical use. Progesterone is the female progesterone produced by the ovaries, placenta and adrenal cortex, which protects the female uterine lining. The level of progesterone in a woman’s body can be used to diagnose whether the ovaries are ovulating normally and whether there are symptoms of pre-miscarriage. Progesterone fights estrogen and acts on the uterus and ovaries. Progesterone is secreted less before ovulation and more after ovulation to maintain the normal physiological function of the ovaries. Progesterone can reduce the contractile action of uterine smooth muscle in pregnant women, inhibit uterine contraction, maintain the development of the fetus during pregnancy, and avoid the occurrence of preeclampsia. Too low or too high progesterone may lead to some adverse problems, progesterone if abnormal, it is recommended to follow the doctor’s instructions for proper treatment.