Abstract
Abnormalities were detected in 2669 of 326,257 elementary and junior high school children (169,856 males and 156,401 females) who were screened at school for urinary abnormalities. Serum complement (C3) level was measured in all 2669 children having urinary abnormalities (811 males, 1856 females). Three had a serum C3 level that was more than three standard deviations below the mean value. Type I membranoproliferative glomerulonephritis (MPGN) was diagnosed on histological examination in one of these three children, while the other two did not undergo renal biopsy because they had serum C3 levels of 40 and 44 mg/dL, respectively, and because their urinary abnormalities were transient. It was considered that there is not much significance in testing the serum complement in the urine screening done at school and the cost/benefit ratio is low. The results appeared to reflect the frequency of persistent hypocomplementemic MPGN in Japan in recent years.
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