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By Mayo Clinic staffThere are no unique physical findings or laboratory tests to positively diagnose premenstrual syndrome. Your doctor may attribute a particular symptom to PMS if it's part of your predictable premenstrual pattern. To establish a pattern, your physician may ask you to keep a record of your signs and symptoms on a calendar or in a diary for at least two menstrual cycles. Note the day that you first noticed your PMS symptoms, as well as the day they disappeared. Also be sure to mark the day your period started and ended. Alternatively, completing a questionnaire on the first day of your period describing your symptoms during the prior two weeks can help your doctor know whether you would benefit from further evaluation.