A nurse is providing discharge teaching to a client who will be performing intermittent self-catheterization. Which of the following instructions should the nurse include?

Choice A reason: Advancing the catheter 2.5-5 cm after urine flow is incorrect, as this risks advancing too far, potentially injuring the bladder or urethra. The catheter should be inserted until urine flows, then slightly further to ensure bladder placement. Choice B reason: Contracting pelvic muscles during catheterization is not advised, as it may increase resistance or cause discomfort. Patients should relax to facilitate smooth catheter insertion and minimize trauma to the urethra. Choice C reason: Inflating a balloon is specific to indwelling (Foley) catheters, not intermittent ones, which lack balloons. This instruction is irrelevant and could confuse the patient, as intermittent catheters are removed after bladder emptying. Choice D reason: Lubricating the catheter tip with water or water-soluble lubricant reduces friction, easing insertion and minimizing urethral trauma. This is a critical step in self-catheterization to ensure safety and comfort, making it an essential instruction.