A 50-Year-Old Is Being Evaluated in the Office Due to Renal

question 304

Multiple Choice

A 50-year-old is being evaluated in the office due to renal stones. He states that his bowel habits change and feels constipated over the last month. He has no prior medical conditions and takes no medication. He has no family history of inherited disease. His physical examination is normal. Lab tests show normal creatine level with elevated calcium serum level 11.5 mg/dl. Further investigation reveal a PTH hormone 99 pg/ml (normal: 10-65) and phosphors inorganic level is 1.9 mg/dl Which of the following is the most likely mechanism causing this patient's low serum phosphate?

• A)Decreased phosphate reabsorption in proximal tubules
• B)Increased bone deposition of phosphorus
• C)Increased fecal loss of phosphorus
• D)Increased phosphate secretion in distal tubules
• E)Transcellular shift of phosphorus into the cells

---

Definitions:

Marginal Value Curve

A curve showing how the value or utility of consuming an additional unit of a good changes as the quantity consumed changes.

Price

The sum of money anticipated, needed, or provided in exchange for something.

Oligopsony Market

A market form in which the number of buyers is small while the number of sellers in theory could be large, giving the buyers significant control over prices and terms.

Buyers

Individuals or entities that purchase goods or services for personal use or for resale.