A remarkable improvement in the efficacy of suprapubic puncture for urine sample collections was observed prospcctively by performing abdominal ultrasound measurements of the bladder's antero posterior diameter (UBAD) prioi to the procedure: 63 suprapubic punctures were performed in 54 infants, one day to 24 months of age, all with clinically suspected urinary tract infections. Attempts to obtain urine samples in this way were always successful when the UBAD exceeded 3.5 cm and always failed when it was 2 cm or less. Intermediate success rates (36.4 to 88.8%) were obtained with UBAD 2.1 to 3.5 cm. The main advantage of this method is that it potentially avoids unnecessarily unsucessful suprapubic punctures as when they are performed blindly.(Key words: Suprapubic bladder puncture. Ultrasound. Bladder anteroposterior diameter).
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