Q184 #Harrison A . 16-year-old female star gymnast presents to your office complaining of fatigue, diffuse weakness, and muscle cramps. She has no previous medical history and denies tobacco, alcohol, or illicit drug use. There is no significant family history. Examination shows a thin female with normal blood pressure. Body mass index (BMI) is 18 kg/m2. Oral examination shows poor dentition. Muscle tone is normal, and neurologic examination is normal. Laboratory studies show hematocrit of 38.5%, creatinine of 0.6 mg/dL, serum bicarbonate of 30 mEq/L, and potassium of 2.7 mEq/L. Further evaluation should include which of the following? A.plasma renin n aldosterone levels B.serum magnesium levels C .urinanalysis n urine culture D.urine toxicology screen for diuretics E.urine toxicology screen for opiates
