The normal levels of CD4+- and CD8+- T-lymphocytes in suspension of peripheral blood lymphocytes of adult people are ~43-52% and ~21-26%, respectively. Ratio CD4+/CD8+ is ~1.89-2.29. The norm for children (1-5 years): CD4+: ~44-54%; Ratio CD4+/CD8+: 2.05-3.07
References:
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2. Bliakher M.S., Fedorova I.M., Lopatina T.K., Arkhipov S.N., Kapustin I.V., Ramazanova. Z.K., Karpova N.V., Ivanov V.A., Sharapov N.V. [Acilact and improvement of the health status of sickly children]. Vestn Ross Akad Med Nauk. 2005;(12):32-5. Russian. PubMed PMID: 16404981.