6. 一位36歲女性，主訴健康檢查發現血尿(hematuria)。門診再一次尿液檢查發現: protein (3+), O.B. (2+),dysmorphic RBC (+), RBC cast (+)。基於這些資料，妳(你)會安排以下進一步檢查，何者最不合適?
(A) IVP (intravenous pyelography)或RP (retrogradepyelography)
(B) 做serology tests, 包括: ant-GBM Ab, ANCA, ASLO(anti-strytolysin O)
(C) 檢測血中 complement levels (C3, C4), cryoglobulin
(D) Renal sonography, 必要時考慮renal biopsy
(E) Urine cytology test