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Review Question - QID 210072

Primary Amenorrhea STUDIES In a patient with primary amenorrhea and an increased FSH, the next step in management is karyotyping QID: 210072 (M2.OMB.18.4827)
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QID 210072 (Type "210072" in App Search)
A 15-year-old girl is brought to the clinic because her mother is worried the patient has not yet had her period. The patient’s older sister had her first period at age 14. The mother had her first period at age 13. The patient reports she is doing well in school and is on the varsity basketball team. Her medical history is significant for asthma and atopic dermatitis. Her medications include albuterol and topical triamcinolone. Her temperature is 98°F (36.7°C), blood pressure is 111/72 mmHg, pulse is 65/min, and respirations are 14/min with an oxygen saturation of 99% on room air. Her body mass index (BMI) is 19 kg/m^2. Physical exam shows absent breast development and external genitalia at Tanner stage 1. Serum follicle-stimulating hormone (FSH) level is measured to be 38 mIU/mL. Which of the following is the most appropriate next diagnostic step?
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