08-26-2010, 11:01 AM
A 17-year-old girl is brought to the health center by her mother because the girl has had only two menstrual periods in the past 8 months. She had regular menstrual periods from menarche at age 14 years until 18 months ago. For the past 18 months she has been training as a long-distance runner.
Item 1 of 2
26. The underlying mechanism of her menstrual dysfunction is best defined by an abnormality in which of the following serum concentrations?
A) Androstenedione
B) Creatine kinase
C) Luteinizing hormone
D) Testosterone
E) Thyroid-stimulating hormone (TSH)
Item 2 of 2
27. Which of the following is the most likely cause of the menstrual irregularity?
A) High-carbohydrate diet
B) Increased basal body temperature
C) Increased muscle mass
D) Loss of body fat
E) Repeated volume depletion
Item 1 of 2
26. The underlying mechanism of her menstrual dysfunction is best defined by an abnormality in which of the following serum concentrations?
A) Androstenedione
B) Creatine kinase
C) Luteinizing hormone
D) Testosterone
E) Thyroid-stimulating hormone (TSH)
Item 2 of 2
27. Which of the following is the most likely cause of the menstrual irregularity?
A) High-carbohydrate diet
B) Increased basal body temperature
C) Increased muscle mass
D) Loss of body fat
E) Repeated volume depletion