1 mL serum from a plain red top tube. Allow sample to clot in an upright position for at least 60 minutes, then centrifuge sample and transfer serum to a plastic transport tube within 2 hours of collection. Clearly label tube as serum from a plain red top tube. Refrigerate.
Note: samples for amh levels should be drawn on days 2-4 of the menstrual cycle to optimize correlation with interpretive chart given in laboratory report.