The normal reference values of follicle stimulating hormone vary somewhat during the follicular, ovulatory, luteal and menopausal phases. 1. Follicular phase: it refers to the period between the cessation of the last menstrual period and ovulation of the ovary, and the reference value of follicle-stimulating hormone in this phase is about 3.85-8.78 IU/L. 2. Ovulation: Ovulation is the process of ovulation when the egg matures and is discharged from the ovary, and follicle-stimulating hormone will gradually increase during this period, with a reference value of about 4.54-22.51 IU/L. 3. Luteal phase: refers to the day before the onset of menstruation after ovulation, the corpus luteum is a glandular structure that is transformed after the follicle is discharged from the ovary. The reference value of follicle stimulating hormone at this time is about 1.79-5.12IU/L. 4. Menopause: i.e. the stage when menstruation is about to stop, the reference value of follicle-stimulating hormone will be greatly elevated in this stage due to the decline of ovaries, and the reference value is about 16.74-113.5IU/L. The above reference value is sometimes different according to the hospital. The above reference values sometimes vary according to different hospitals and different testing equipment, and the test results should be based on the reference range of the specific laboratory test.