A 51-year-old postmenopausal woman taking ethinyl estradiol/levonorgestrel presented to her obstetrician/gynecologist with irregular vaginal bleeding. As a part of the routine work-up, a serum beta human chorionic gonadotropin (β-hCG) concentration was measured at 28,725 IU/L. A repeat serum β-hCG value four days later was 29,592 IU/L, while an elevated β-hCG concentration was also detected in the patient's urine.
Brooke Katzman, Ph.D.
Fellow, Clinical Chemistry
Nikola Baumann, Ph.D.
Consultant, Division of Clinical Core Laboratory Services
Assistant Professor of Laboratory Medicine and Pathology,
Mayo Clinic College of Medicine