Following a lumbar puncture (spinal tap), which position should the client be placed in and for how long?

POST-LUMBAR PUNCTURE CARE: POSITIONING: Flat (supine or prone) 4-8 hours per order — the evidence for preventing post-LP headache with positioning has evolved (some studies suggest not clearly beneficial) but most institutions still recommend flat positioning; the rationale: CSF leaks through the dural puncture site when upright; lying flat reduces pressure differential; POST-LP HEADACHE: Most common complication; worst when upright, relieved when flat; typically occurs 24-48 hrs post-procedure; TREATMENT: Fluids (increases CSF production); caffeine (vasoconstrictive, reduces headache); blood patch (definitive treatment if severe — autologous blood injected at puncture site to seal the leak); MONITORING: Vital signs; neurological status; headache assessment; check puncture site for CSF leak or haematoma; ADDITIONAL POST-LP CARE: Encourage PO fluids if not restricted; monitor sensation/movement in lower extremities; report any numbness, weakness, or bowel/bladder changes immediately.