Figure 1.
Estrogen, luteinizing hormone (LH), follicle-stimulating hormone (FSH), and progesterone levels during an idealized 28-day menstrual cycle with the LH surge around day 14.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.