Diagnosis for Luteal Phase DefectIt may be difficult to diagnose a luteal phase defect. There is no single test that can diagnose it. Blood tests that can be helpful include:-- Follicle-stimulating hormone (FSH) level-- Luteinizing hormone (LH) level-- Pregnancy test-- Progesterone level
Some doctors recommend a series of endometrial biopsies. This checks the lining of the uterus. A small sample of this lining is removed at a specific time of the month and examined under a microscope.