A device, in particular disposable device, for measuring at least one characteristic variable or at least one parameter of at least one body fluid, comprising - at least one card-shaped carrier having a first surface and having a second surface facing away from the first surface, - at least one, in particular needle-shaped, perforating, scribing or pricking means on the first surface, and - at least one pad (30s, 30r) which is assigned to the perforating, scribing or pricking means and by means of which the body fluid is separable and/or absorbable and the at least one characteristic variable or the at least one parameter is determinable, characterized in - that the pad (30s, 30r) is made of two parts, namely -- in the form of a module separating the body fluid and assigned to the perforating, scribing or pricking means, and -- in the form of a module reactive with the body fluid and assigned to the second surface, - that the characteristic variable which can be determined by the reactive module and/or the parameter which can be determined by the reactive module is evaluatable by at least one evaluation means (40; 42) which can be set in relation to the reactive module, the evaluation means (40; 42) being given -- by reference or comparison data related to the characteristic variable or to the parameter which are provided, for example printed, on the second surface, and/or -- by at least one external application or external facility related to the characteristic variable or to the parameter. - at least one card-shaped carrier having a first surface and having a second surface facing away from the first surface, - at least one, in particular needle-shaped, perforating, scribing or pricking means on the first surface, and - at least one pad (30s, 30r) which is assigned to the perforating, scribing or pricking means and by means of which the body fluid is separable and/or absorbable and the at least one characteristic variable or the at least one parameter is determinable, - that the pad (30s, 30r) is made of two parts, namely -- in the form of a module separating the body fluid and assigned to the perforating, scribing or pricking means, and -- in the form of a module reactive with the body fluid and assigned to the second surface, -- in the form of a module separating the body fluid and assigned to the perforating, scribing or pricking means, and -- in the form of a module reactive with the body fluid and assigned to the second surface, - that the characteristic variable which can be determined by the reactive module and/or the parameter which can be determined by the reactive module is evaluatable by at least one evaluation means (40; 42) which can be set in relation to the reactive module, the evaluation means (40; 42) being given -- by reference or comparison data related to the characteristic variable or to the parameter which are provided, for example printed, on the second surface, and/or -- by at least one external application or external facility related to the characteristic variable or to the parameter. -- by reference or comparison data related to the characteristic variable or to the parameter which are provided, for example printed, on the second surface, and/or -- by at least one external application or external facility related to the characteristic variable or to the parameter.