&NA;CSF TRAP (Transport and Rapid Accessioning for Additional Procedures) is a procedure that provides storage of and rapid access to cerebrospinal fluid (CSF) specimens and allows clinicians to review initial findings before ordering low‐yield CSF studies. The cost‐effectiveness of routinely using the CSF TRAP procedure with myelography is examined in a study group of 819 patients, 74% with disc diseases, spinal stenosis, spondylolisthesis, or pain syndromes, 10% with cancer, and 16% with neuropathies and miscellaneous conditions. Routine studies on CSF obtained during myelography provided little additional clinical information, except for patients with cancer (of 80 patients with cancer, the results of cytological examination of the CSF were positive in 12) and patients with multiple sclerosis, for whom oligoclonal band and lgG analysis provided supportive diagnostic data. The utilization of the CSF TRAP procedure with elimination of unnecessary culture and cytological studies on patients with disc diseases, spinal stenosis, spondylolisthesis, and pain syndromes, reduces myelographic CSF procedures by 20%, for a savings exceeding $14,000. The CSF TRAP procedure allows for a more cost‐efficient analysis of CSF obtained using myelography, while providing fluid for analysis in patients with unexpected findings. (Neurosurgery25:76‐80, 1989)