A progesterone level of 16.3ng/mL during the luteal phase and pregnancy is normal; however, if it is measured outside of the luteal phase and outside of pregnancy, it is considered abnormal. Generally, the progesterone level in the luteal phase is 15.9-63.6ng/mL, and if the progesterone level of 16.3ng/mL is measured in the luteal phase, the level is within the normal value, so it is a normal situation. In addition, the value of progesterone after pregnancy is generally greater than 15ng/mL, so progesterone 16.3ng/mL may be pregnant; however, if the value of progesterone 16.3ng/mL is measured in the follicular phase and other phases of the test, it is mostly considered to be an abnormal situation. Therefore, in order to know what is the normal value of progesterone, you need to go to a regular hospital to consult an obstetrician and gynecologist, who will make a comprehensive assessment based on the examination time and the patient’s physical condition, and decide on the treatment plan based on the assessment results.