FIELD: medicine; applicable in selection of desired and nondesired subpopulations from specimen of tested liquid or obtaining of enriched subpopulation with one or more removed nondesired subpopulations. SUBSTANCE: method includes interaction of examined specimen with particles with reagent connected thereto, specifically connected with selected subpopulation. Particles are used in form of particles whose density is twice as large as average density of cells of selected subpopulation, and diameter is, at least, 3 mcm. Examined specimen is mixed with particles for multiple precipitation of said particles. After mixing, provision is made for possible differential precipitation of particles and separation of selected subpopulation. EFFECT: higher efficiency. 35 cl, 34 dwg, 12 tbl
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