Decreased creatinine is associated with which finding?

Decreased creatinine is associated with which finding?

• A. Reduced muscle mass
• B. Dehydration
• C. Starvation
• D. Increased BUN

Answer: (A)

Creatinine production tracks muscle mass and is cleared by the kidneys. With less muscle, less creatinine is produced, so the serum level falls. That direct link to muscle tissue is why decreased creatinine best reflects reduced muscle mass. Dehydration tends to raise creatinine because kidney filtration drops, not lower it. Starvation can also lead to muscle loss and may lower creatinine, but the strongest, most direct association tested is with reduced muscle mass. Increased BUN usually accompanies dehydration or increased protein breakdown and doesn’t explain a lower creatinine.

Creatinine production tracks muscle mass and is cleared by the kidneys. With less muscle, less creatinine is produced, so the serum level falls. That direct link to muscle tissue is why decreased creatinine best reflects reduced muscle mass. Dehydration tends to raise creatinine because kidney filtration drops, not lower it. Starvation can also lead to muscle loss and may lower creatinine, but the strongest, most direct association tested is with reduced muscle mass. Increased BUN usually accompanies dehydration or increased protein breakdown and doesn’t explain a lower creatinine.