Paediatricscommon
An 8-year-old boy is referred to the paediatric clinic after a school nursing screen recorded a blood pressure of 132/84 mmHg, above the 95th centile for his age, sex and height. He is asymptomatic, plays football, and has no headaches or visual symptoms. His body mass index is above the 97th centile and his upper arms are large. You notice that the cuff used at the screen, and again by your resident this morning, has a bladder that covers about a third of the circumference of his upper arm. Which one of the following should be done first?