A post-operative client is 6 hours after abdominal surgery and has not urinated. What is the nurse's FIRST action?

POST-OPERATIVE URINARY RETENTION ASSESSMENT: NORMAL: Most patients void within 6-8 hours after surgery; ASSESSMENT FIRST: Before inserting a catheter (invasive procedure), assess: palpate suprapubic area for distension and firmness; ask if patient feels urge to void; review total fluid intake (IV + oral) since surgery; BLADDER SCANNER: If available, perform bladder scan to quantify volume (>300-400 mL with inability to void = retention); CONSERVATIVE INTERVENTIONS: Offer bedpan or urinal in a private, comfortable position; run water audibly; apply warm compress to suprapubic area; ambulate to the bathroom if safe and ordered; CATHETERIZATION THRESHOLD: Typically if conservative measures fail AND bladder volume >500 mL OR patient has significant discomfort; COMMON CAUSES: Anesthesia (bladder relaxation); opioid medications (urethral sphincter tone increased); lying flat (difficult to void for many people); anxiety. PN SCOPE: Assess, implement conservative measures, report to RN for catheterisation orders.