A patient has a urea nitrogen of 60 mg per deciliter with a creatinine of 1.0 mg per deciliter. Which condition is most consistent with this ratio?
1Prerenal azotemia such as dehydration✓ 정답
2Intrinsic renal disease such as tubular necrosis
3Postrenal obstruction of the urinary tract
4Analytical interference in the assay
해설
When the kidney itself is injured, urea nitrogen and creatinine rise together. A disproportionate rise in urea nitrogen alone reflects reduced renal perfusion with increased urea reabsorption, that is, dehydration or another prerenal cause. A high ratio is the signature of a prerenal state.