<prompt> A 42 years old male has strong positive Benedicts test, random blood sugar is 163 mg, fasting blood sugar is 200 mg Next line of investigation is -:Urine glucose charting 5 hourlyOral GTTRepeat benedicts test24 hr. urine sugar estimation  <response>: Ans. is b Oral G.T.T. Diagnostic Criteria for Diabetes1 Symptoms of diabetes plus random blood glucose concentration 200 mgdl. Random is defined as without regard to time since last meal or2 Fasting plasma glucose 126 mgdl or3 Two hour plasma glucose 200mgdl during an oral GTTHarrison further adds that in the absence of unequivocal hyperglycemia and acute metabolic decompensation these criterias should be confirmed by repeat testing on a different day.Now coming to the questionRandom blood sugar 163 mgFasting blood sugar 200 mgThe random blood sugar level of this patient does not meet the criteria for diabetes mellitus whereas fasting blood sugar far exceeds the required level i.e. the tests give an equivocal result so according to Harrison this pt must undergo further test on another day.Benedicts test is a qualitative test for detecting the presence of sugar in urine so there is no use in repeating it. 