Elongated incubation trough, having an indentation open toward a top end of the incubation trough, extending along a longitudinal direction of the incubation trough, as well as a bottom, which bounds the indentation toward a lower end of the incubation trough, wherein the indentation has a first receiving area to receive an elongated test strip, wherein the indentation moreover has a second receiving area to receive an end section of a fluid line, the second receiving area being in fluidic communication with the first receiving area, wherein moreover a width of the second receiving area at bottom height is greater than a width of the first receiving area at bottom height, wherein the bottom is formed along a two-dimensional bottom plane, characterized in that, moreover, a lateral boundary of the first receiving area is formed along the longitudinal direction by two respective, mutually facing longitudinal walls (W1, W2), wherein at least one of the longitudinal walls runs at a slant to the bottom plane such that the first receiving area narrows from the top end toward the bottom, moreover in that both of the longitudinal walls (W1, W2) are slanted to the bottom plane, so that the first receiving area has a cross section with a conical extent from the top end to the bottom plane, moreover in that a lateral boundary of the second receiving area is formed by two respective, mutually facing longitudinal walls (W11, W12), wherein both of the longitudinal walls (W11, W12) run at a slant to the bottom plane such that the second receiving area narrows from the top end toward the bottom and such that the indentation in the second receiving area has an aperture angle. having an indentation open toward a top end of the incubation trough, extending along a longitudinal direction of the incubation trough, as well as a bottom, which bounds the indentation toward a lower end of the incubation trough, wherein the indentation has a first receiving area to receive an elongated test strip, wherein the indentation moreover has a second receiving area to receive an end section of a fluid line, the second receiving area being in fluidic communication with the first receiving area, wherein moreover a width of the second receiving area at bottom height is greater than a width of the first receiving area at bottom height, wherein the bottom is formed along a two-dimensional bottom plane, characterized in that, moreover, a lateral boundary of the first receiving area is formed along the longitudinal direction by two respective, mutually facing longitudinal walls (W1, W2), wherein at least one of the longitudinal walls runs at a slant to the bottom plane such that the first receiving area narrows from the top end toward the bottom, moreover in that both of the longitudinal walls (W1, W2) are slanted to the bottom plane, so that the first receiving area has a cross section with a conical extent from the top end to the bottom plane, moreover in that a lateral boundary of the second receiving area is formed by two respective, mutually facing longitudinal walls (W11, W12), wherein both of the longitudinal walls (W11, W12) run at a slant to the bottom plane such that the second receiving area narrows from the top end toward the bottom and such that the indentation in the second receiving area has an aperture angle.