A 15-Year-Old Boy Complains of Vomiting, Anorexia, and Weight Loss

question 36

Multiple Choice

A 15-year-old boy complains of vomiting, anorexia, and weight loss. Laboratory studies reveal: serum calcium 13 mg/dL (normal 8.7-10.6 mg/dL) ; blood urea nitrogen 36 mg/dL (normal 7-22 mg/dL) ; serum creatinine, 1.8 mg/dL (normal 0.3-0.7 mg/dL) . He has been taking several high-potency vitamin supplements daily for the past year as part of a 'body-building' program. An excess of which of the following vitamins is the most likely cause of these findings?

• A) Vitamin A
• B) Vitamin B
• C) Vitamin C
• D) Vitamin D
• E) Vitamin E

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Definitions:

Red Blood Cells

Cells in the blood that carry oxygen from the lungs to the body's tissues and return carbon dioxide from tissues back to the lungs.

Megakaryocyte

A large bone marrow cell responsible for the production of blood thrombocytes (platelets), which are critical for clotting.

Thrombocyte

A blood cell component, also known as a platelet, involved in blood clotting.

Coagulation

The process by which blood changes from a liquid to a gel, forming a clot, which is essential for stopping bleeding.