title: Measurement of CD4+ T cells in point-of-care settings with the Sysmex pocH-100i haematological analyser.
abstract: The decision to provide antiretroviral therapy to HIV-positive patients mainly depends on the CD4(+) T-cell count, with therapy indicated at a cut-off value of <350-200 CD4(+) T cells/microl blood. Monitoring patients is still a major problem in countries with limited resources where blood samples often have to be transported over long distances to regional referral centres in which the count can be performed on flow cytometers. We have evaluated a newly developed simple and inexpensive method for CD4(+) T-cell quantification. It is a variation of the Invitrogen T4 Quant kit, with manual isolation of nuclei from CD4(+) T cells and subsequent counting on the small haematology analyser pocH-100i, Sysmex. We have demonstrated that this new method is highly reproducible and gives stable and linear results over a wide range of CD4(+) T-cell concentrations. Method comparison to two different flow cytometers showed excellent correlation with concordances of about 93%. Overall, this method is rapid, easy to perform and offers a good reliable alternative to measurement by flow cytometry. The pocH-100i has the additional benefit of providing a complete blood count with a three-part white blood cell differential and software for patient data storage and handling.
authors.affiliation: Department of Haematology, University College London Hospital, London, UK. carolbriggs@hotmail.com
authors.forename: C
authors.initials: C
authors.lastname: Briggs
authors.forename: S
authors.initials: S
authors.lastname: Machin
authors.forename: M
authors.initials: M
authors.lastname: Müller
authors.forename: W
authors.initials: W
authors.lastname: Haase
authors.forename: K
authors.initials: K
authors.lastname: Hofmann
authors.forename: F
authors.initials: F
authors.lastname: Forstreuter
authors.forename: R
authors.initials: R
authors.lastname: Hinzmann
mesh_terms: D044966:Anti-Retroviral Agents / Q000627:therapeutic use; D018791:CD4 Lymphocyte Count / Q000295:instrumentation / Q000379:methods*; D016903:Drug Monitoring; D005434:Flow Cytometry; D015658:HIV Infections / Q000188:drug therapy / Q000276:immunology*; D006801:Humans; D019095:Point-of-Care Systems
chemical_list: D044966:Anti-Retroviral Agents