Urine microscopy shows casts containing numerous red blood cells. Which interpretation is most appropriate?
1The bleeding source is within the renal parenchyma, commonly glomerular✓ 정답
2The finding is caused only by lower urinary tract contamination
3The finding is characteristic of uncomplicated cystitis
4The cast formed after urine left the patient
해설
Casts form within renal tubules. Red blood cells incorporated into a cast therefore localize the source to the kidney and strongly support glomerular or renal parenchymal bleeding.
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