METHOD OF DETERMINING VANCOMYCIN CONCENTRATION IN BIOLOGICAL FLUIDS IN NEWBORNS Russian patent published in 2011 - IPC G01N33/48 C12Q1/04 C12R1/285 

FIELD: medicine.

SUBSTANCE: blood serum is diluted with physiologic saline in the ratio 1:2, 1:5, 1:10, 1:20 and 1:50, and tracheobronchial aspirates are diluted with physiologic saline in the ratio 1:2, 1:4, 1:8, 1:16 and 1:32. A solid nutrient medium of the following composition is prepared: a nutrient microbiological dry agar 26.5 g, a nutrient yeast extract 1.22 g, lactose 10.7 g, disodium phosphate 0.48 g, anhydrous sodium sulphite 0.83 g, sodium carbonate 0.03 g, sodium hydroxide 5.0 g, distilled water 1000 ml, pH 8.0 which contains the test strain Micrococcus lysodeiktikus 2665 in the concentration 50 million microbial cells in 1 ml of the medium. Simultaneously with the material being analysed, a reference concentration 5 mcg/ml is introduced in the wells of the diameter 8 mm on each Petri dish. In 18 hours of the incubation procedure at 37°C, a diameter of test strain growth retardation zone surrounding the wells are measured. The vancomycin concentration, mcg/ml is determined by a calibration curve of growth retardation zone diameter to the reference vancomycin concentration.

EFFECT: use of the declared method allows determining the vancomycin concentration in the biological fluids and ensuring higher clinical effectiveness.

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