| Identification of the Source of hematuria by the Ratio of the Urinary Erythrocyte MCV to That in Blood |
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Young Guk Kim, Gi Chan Lee, Keun Haeng Cho, Kee Hwan Yoo, Soon Kyum Kim |
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Department of Pediatrics, College of Medicine, Korea University, Seoul, Korea |
| 소변과 혈액내 í‰ê· ì 혈구용ì 비율(Urine MCV/Blood MCV)ì„ ì´ìš©í•œ í˜ˆë‡¨ì˜ ê°ë³„ |
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ê¹€ì˜êµ, ì´ê¸°ì°¬, 조근행, ìœ ê¸°í™˜, 김순겸 |
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ê³ ë ¤ëŒ€í•™êµ ì˜ê³¼ëŒ€í•™ 소아과학êµì‹¤ |
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| Abstract |
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The frequent occurrence of hematuria in children necessitates diagnostic evaluation. Hematuria may occur with either renal or lower urinary tract disease. Clarification of the etiology of hematuria, whether microscopic or gross, is facilited by localizing the site of bleeding to the kidney(glomerular) or the lower urinary tract (non-glomerular). The mean cellular volume (MCV) of urinary red blood cells (RBCs) of pediatric patients with glomerular (group I; n=77) and non-glomerular (group II; n=34) hematuria was determined using coulter Counter Model S plus IV. We found that red blood cells of glomerular origin had a smaller volume than non-glomerular cells (73.79¡¾9.75um3 vs 83.55¡¾3.77 um3, p<0.001). If an urinary MCV equal to 80.56um3 was taken as the cut-off value between glomerular and non-glomerular hematuria, a correct assessment of the site of bleeding was made in 89 (80%) of the 111 patients studied (sensitivity 76%, specificity 88%).
The ratio of the urinary erythrocyte MCV to that in blood (Umcv/Bmcv) was compared with the diagnosis. If an Umcv/Bmcv ratio equal to 0.95 was taken as the cut-off value between glomerular and non-glomerular hematuria, a correct assessment of the site of bleeding was made in 93 (83%) of the 111 patients studied (sensitivity 79.6%, specificity 94%).
Coulter counter analysis of urine provides a simple nonivasive and objective aid to the diagnosis of hematuria. This test, when used early in the management of pediatric patients with hematuria, may help to avoid invasive investigations. |
| Key Words:
Hematuria, Urinary red blood cell volume |
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