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Below is the paper I referred to.
GOING DIPPY OVER IVUS?
N. Arya , M. Shuaib, G.T Manivannan, D. Ports. Wycombe General Hospital , A&E department, Queen Alexandra Road, High Wycombe, South Bucks, HP11 2TT
From 40 patients (with 41 intravenous urograms) being investigated for renal/ureteric colic in an emergency department we compared the results of their urine for blood on the dipstix(R.) scale of +1 to +3 (+1=negative, +2=trace of lysed blood, +3=trace of in tact blood) to the results of their respective intravenous urograms (1Vus) to assess the possibility of urinary tract calculi.
Dipstix result
IVU results + 1 +2 +3
Conclusive negative 8 3 13
Probably negative 0 3 1
Conclusive positive 0 2 7
Probably positive 0 1 3
Results:
The results suggest to us that:
+1 result on dipstix: there is little probability of a positive IVU
+2 result on dipstix: the probability of a positive IVU is small but warrants investigation with a non-urgent IVU
+3 result on dipstix: there is a reasonable probability of a positive IVU & justifies an urgent IVU.
Ray McGlone
Lancaster