title: Are more lumbar punctures needed after CT scan?
mesh_terms: D004636:Emergency Service, Hospital / Q000458:organization & administration; D006801:Humans; D020380:Needs Assessment; D017410:Practice Guidelines as Topic; D010818:Practice Patterns, Physicians'; D013129:Spinal Puncture / Q000706:statistics & numerical data*; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D014481:United States