Which of the following lists correctly reflects the expected plasma/serum changes in a patient with suspected renal failure?

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Multiple Choice

Which of the following lists correctly reflects the expected plasma/serum changes in a patient with suspected renal failure?

Renal failure disrupts filtration and electrolyte balance, so you see a characteristic mix of elevated waste products and shifts in minerals and acids. The kidneys can’t clear urea, creatinine, and uric acid effectively, so these rise in the blood. Phosphate isn’t excreted well either, so it goes up, while calcium tends to fall because high phosphate binds calcium and kidney activation of vitamin D is reduced. The buildup of acids lowers bicarbonate (ECO2), producing metabolic acidosis. Potassium is retained, leading to hyperkalemia, and magnesium is also cleared less, so it increases. Enzyme levels like amylase and lipase can rise due to reduced renal clearance, and prolactin can accumulate for the same reason. LDH may rise as a nonspecific marker of tissue stress. Sodium often decreases in this setting due to fluid overload and dilution effects. This pattern—urea, creatinine, uric acid, and phosphate up; calcium, bicarbonate (ECO2), and sodium down; potassium and magnesium up; and increases in amylase, lipase, prolactin, and LDH—best fits renal failure and matches the described option.

Renal failure disrupts filtration and electrolyte balance, so you see a characteristic mix of elevated waste products and shifts in minerals and acids. The kidneys can’t clear urea, creatinine, and uric acid effectively, so these rise in the blood. Phosphate isn’t excreted well either, so it goes up, while calcium tends to fall because high phosphate binds calcium and kidney activation of vitamin D is reduced. The buildup of acids lowers bicarbonate (ECO2), producing metabolic acidosis. Potassium is retained, leading to hyperkalemia, and magnesium is also cleared less, so it increases. Enzyme levels like amylase and lipase can rise due to reduced renal clearance, and prolactin can accumulate for the same reason. LDH may rise as a nonspecific marker of tissue stress. Sodium often decreases in this setting due to fluid overload and dilution effects. This pattern—urea, creatinine, uric acid, and phosphate up; calcium, bicarbonate (ECO2), and sodium down; potassium and magnesium up; and increases in amylase, lipase, prolactin, and LDH—best fits renal failure and matches the described option.

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