Which electrolyte pattern is characteristic of chronic renal failure?

Which electrolyte pattern is characteristic of chronic renal failure?

• A. Increased inorganic phosphorus, magnesium, potassium; decreased calcium and erythropoietin
• B. Decreased inorganic phosphorus and potassium; increased calcium
• C. Normal electrolytes
• D. All electrolytes equally elevated

Answer: (A)

Chronic kidney disease disrupts the kidney’s ability to excrete electrolytes and to produce erythropoietin. With reduced filtration, phosphate cannot be cleared effectively, so inorganic phosphorus rises (hyperphosphatemia). The excess phosphate binds calcium, lowering serum calcium levels (hypocalcemia), and impaired activation of vitamin DFurther reduces calcium absorption from the gut, reinforcing the low calcium state. At the same time, the kidney’s diminished function decreases erythropoietin production, leading to anemia. Potassium and magnesium excretion are also impaired, so potassium and magnesium tend to rise (hyperkalemia and hypermagnesemia) as kidney function worsens. This combination—high phosphate, potassium, and magnesium with low calcium and erythropoietin—fits the electrolyte pattern seen in chronic renal failure.

Chronic kidney disease disrupts the kidney’s ability to excrete electrolytes and to produce erythropoietin. With reduced filtration, phosphate cannot be cleared effectively, so inorganic phosphorus rises (hyperphosphatemia). The excess phosphate binds calcium, lowering serum calcium levels (hypocalcemia), and impaired activation of vitamin DFurther reduces calcium absorption from the gut, reinforcing the low calcium state. At the same time, the kidney’s diminished function decreases erythropoietin production, leading to anemia. Potassium and magnesium excretion are also impaired, so potassium and magnesium tend to rise (hyperkalemia and hypermagnesemia) as kidney function worsens. This combination—high phosphate, potassium, and magnesium with low calcium and erythropoietin—fits the electrolyte pattern seen in chronic renal failure.