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Previous studies have shown that CD4-positive T cells vary in a predictable manner over 24 h. This diurnal variance has significant clinical implications. Recently, viral RNA measurements have been increasingly used as a standard marker in the management of human immunodeficiency virus (HIV)-infected patients. Little detailed analysis of the variability of this marker has been conducted. To define the variance of plasma HIV-1 RNA levels within days, 11 clinically stable patients with established HIV infection and a baseline viral RNA level &gt;40,000 copies/mL were studied. Following the patients' admission to an inpatient research unit, plasma samples were obtained frequently over 48 h and analyzed for HIV-1 RNA levels by use of a quantitative branched chain DNA assay (bDNA). No diurnal pattern was detected. In these clinically stable patients, viral RNA levels exhibited a variance of approximately 0.4 log.

Variance of Plasma Human Immunodeficiency Virus Type 1 RNA Levels Measured by Branched DNA within and between Days