A 21-Year-Old Man Comes to the Office Due to Recent

A 21-year-old man comes to the office due to recent weight loss and fatigue.  The patient is a college athlete and states, "My coach wants me to put on more weight, but I can't seem to do it.  It doesn't matter how much I eat, I keep losing weight.  I've been really thirsty and drinking lots of water lately too, and it's causing me to use the bathroom frequently during practice.  I'm worried that I'm going to get dropped from the team if I don't get myself together."  He is sexually active and has 1 lifetime partner.  The patient's father was diagnosed with colon cancer at age 64.  Which of the following studies would be the best next step to establish the diagnosis in this patient?

A) Colonoscopy
B) Hemoglobin A1c
C) HIV testing
D) Serum TSH level
E) Urinalysis
F) Urine drug screen

Correct Answer:

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