There is no single laboratory test for PMS, but one of the most common ways to diagnosis PMS is by keeping a daily checklist, chart or "menstrual cycle diary" that tracks when your premenstrual symptoms occur for a few consecutive months. Your health care professional should rule out other disorders or diseases that mimic or are identical to the symptoms caused by PMS before diagnosing you with the condition. Other conditions include but are not limited to thyroid disorders, depression, endocrine abnormalities, menopause, heart problems, allergies and low blood sugar. Laboratory tests, personal and family medical histories and a physical exam are part of the diagnostic process.