A urine specific gravity measured by refractometer is unexpectedly high. Which substance is most likely to cause this discrepancy?
1Ketones present in high concentration
2Urobilinogen present in a markedly increased amount
3Glucose or protein present in high concentration✓ 정답
4Nitrite produced by urinary bacteria
해설
A refractometer measures refractive index, so large heavy molecules raise the reading. Substantial glucose or protein therefore produces a specific gravity higher than the true degree of concentration. Correct the value or confirm with osmolality.