Blood staining patch, method and device for blood test using the same

A blood testing method for performing hematological analysis through staining of staining targets using at least one staining gel patch, wherein the staining gel patch is three-dimensional gel matrix containing at least one staining reagent for staining the staining targets present in blood, the blood testing method comprising:

• smearing blood on a plate;
• fixating the blood on the plate;
• and
• providing the staining reagent to the plate using the staining gel patch,
• wherein the providing the staining reagent to the plate using the staining gel patch includes:
• delivering the staining reagent to the plate by contacting the staining gel patch containing the staining reagent to the plate;
• and
• washing a residual staining reagent that has not reacted with the staining targets among the delivered staining reagent from the plate by lifting the residual staining reagent along with patch,
• wherein the staining target are blood cells, parasites or bacteria in the blood
• wherein the method does not comprise washing step that involves directly spraying a washing solution onto the plate.