Glued or heat-sealed cap for resealing test tubes for clinical analyses

An assembly used in clinical analysis comprising:

• a test tube having an open mouth at one end and a side surface extending therefrom, said open end having an edge extending therearound;
• and
• an outer cap formed of a deformable aluminum foil positioned on said open mouth so as to cover said open mouth in gas-tight relationship therewith, said outer cap wrapping around said side surface of said test tube adjacent said open mouth, said outer cap having an adhesive heat-sealed first lacquer on a surface of said foil in contact with said edge of said open mouth and with said side surface, said outer cap having a second lacquer on an opposite surface of said foil, said first lacquer being of a material identical to a material of said second lacquer, said second lacquer being in direct contact with said foil, said material of said first lacquer being compatible with a material of said test tube, said outer cap being entirely closed over an area defined by said edge of said open end.