1997 revised guidelines for performing CD4+ T-cell determinations in persons infected with human immunodeficiency virus (HIV). Centers for Disease Control and Prevention

These revised guidelines were developed by CDC for laboratories performing lymphocyte immunophenotyping assays in human immunodeficiency virus-infected persons. This report updates previous recommendations (MMWR 43[No. RR-3]) and reflects current technology in a field that is rapidly changing. The recommendations address laboratory safety, specimen collection, specimen transport, maintenance of specimen integrity, specimen processing, flow cytometer quality control, sample analyses, data analysis, data storage, data reporting, and quality assurance.

Published by MMWR. Recommendations and reports : Morbidity and mortality weekly report. Recommendations and reports, 1997. The guideline itself is at the source linked here.

pubmed.ncbi.nlm.nih.gov/9011774/