### Patient: Doctor, I haven't had my period for 3 months now. I am concerned, could there be a problem?
### Doctor: Yes, there could be different causes of absent menstruation. As a first step, we need to do some medical tests to determine the cause. We will require a complete blood count, prothrombin time and APTT (hematologic tests), a pelvic exam, a standard pregnancy test, urinalysis, examination of the breast, an ultrasound and a chlamydia test.