Test tube with optically readable coding

A test tube, comprising a tubular container having a bottom end and a filling aperture, a carrier part, the carrier part being fixed to the bottom end of the container and having a surface provided with a dot code readable with an optically reading mechanism, the surface being substantially flat, faces away from the filling aperture and extends substantially across the bottom end of the tube, the carrier part is made of a laser burnable material wherein the dot code is burned into the surface and has a center-to-center distance between the dots of less than 0.5 mm, and wherein the tubular container is made of a material different from the carrier part material wherein the carrier part material between the dot code and the tubular container, provides the surface a background which is optically opaque to an optical reading mechanism.