FIELD : medicine.SUBSTANCE : group of inventions relates to medicine. Proposed hydrophilic coating applied to at least part of the surface of the analytical aid used in the device for the purposes of selection and/or analysis of biological fluid samples, where the specified coating contains nanoparticles with a silicon dioxide structure and an average size of 1–500?nm, including groups of structure (I). Also proposed : a method for manufacturing the specified hydrophilic coating on the analytical aid for the selection and/or analysis of samples of biological fluid; an analytical aid obtained by this method; a biological fluid sampling device having this analytical aid. In addition, the invention relates to the use of these nanoparticles with a silicon dioxide structure as a hydrophilic coating.EFFECT : group of inventions provides high wettability and high stability of the proposed hydrophilic coating.19 cl, 1 dwg, 3 tbl, 4 ex