FIELD: medicine. SUBSTANCE: method involves introducing dry composition into whole undiluted blood sample. The composition has glucose dehydrogenase, one or several substances selectable from a group composed of diaphorase, phenazine methosulfate phenazine ethosulfate phenazine phenosulfate and meldolas blue; one or several substances from a group composed of nicotinamide dinucleotide, nicotinamide dinucleotide phosphate, thio-nicotinamide dinucleotide, thio- nicotinamide dinucleotide phosphate, nicotinamide purine dinucleotide, nicotinamide methylpurine dinucleotide, nicotinamide-2-chloromethylpurine dinucleotide; one or several substances selectable from a group composed of phospholipase, hemolyzing saponines and derivatives of mono-, di- or trisaccharides and aliphatic hydrocarbons containing 10-16 carbon atoms; reduction-oxidation indicator dye and, optionally, mutarose. Changes in color are recorded in process of reaction of whole undiluted blood with the mentioned reactive by means of spectrophotometric examination (in passing-through mode). EFFECT: enhanced accuracy in determining glucose contents in blood. 7 cl, 5 dwg
