Urinalysis Not Helpful
Researchers have found that the absence or presence of microhematuria does not accurately predict whether a distal ureteral stone is still present or has passed, according to a report in the Journal of Endourology (2008;22:1233-1236).
Gerald Yoon, MD, and his colleagues at Kaiser Permanente,
The sensitivity and specificity of urinalysis were 40% and 63%, respectively. The predictive value of a positive urinalysis was 57% and the predictive value of a negative test was 55%. The researchers concluded that “urinalysis is no better than randomness in predicting presence or absence of a stone by CT.”