Abstract
During a six-month interval, 1,677 cerebrospinal fluid (CSF) specimens with cell counts of 0 to 5 X 10(6)/L were examined by one of six physician microscopists. Malignant cells were found in ten of these CSF specimens. In seven, unidentified cells had been noted on prior review by a technologist. Technologists had a frequency of false negative errors of 0.12%. Physicians had a frequency of apparent false positive errors of 0.12%. There is little or no benefit from physician microscopic examination of all CSF specimens that have normal cell counts. Adoption of a different policy would reduce medical care costs by $40,000 for this entire series of 1,677 specimens without adversely affecting the quality of laboratory results.
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