A 16-year-old female presents to the gynecology clinic reporting that she has never had a menstrual period. She became sexually active six months ago and uses condoms inconsistently. She has no chronic medical conditions and takes no medications. Physical examination reveals normal external genitalia, Tanner stage 4 breast development, and Tanner stage 4 pubic hair. Her body mass index (BMI) is 22 kg/m². Arrange the following diagnostic steps in the most appropriate sequential order for evaluating this patient's primary amenorrhea.
- 1Perform a urine beta-hCG test
- 2Perform a pelvic ultrasound
- 3Measure serum follicle-stimulating hormone (FSH), thyroid-stimulating hormone (TSH), and prolactin levels
- 4Perform a magnetic resonance imaging (MRI) of the brain
Answer
The correct sequence is: 1) Perform a urine beta-hCG test, 2) Perform a pelvic ultrasound, 3) Measure serum FSH, TSH, and prolactin levels, 4) Perform an MRI of the brain.
The correct sequence strictly follows standard gynecological guidelines for evaluating primary amenorrhea. A beta-hCG test is universally the first step in reproductive-age females. Once pregnancy is excluded, the algorithm for primary amenorrhea with normal breast development dictates a pelvic ultrasound to check for the uterus. If the uterus is present, systemic endocrine causes are evaluated with FSH, TSH, and prolactin. Finally, if these labs point to a central defect, an MRI is indicated.
Step-by-Step Solution
Key Concept
The step-wise evaluation of primary amenorrhea in a patient with normal secondary sexual characteristics begins with a pregnancy test, followed by pelvic imaging to assess the uterus, and subsequent endocrine laboratory testing.
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