Device (12, 112, 212, 312) for taking a biological liquid sample intended to be able to be inserted into a portable reader (14, 314) for analysing the biological liquid, the sampling device (12, 112, 212, 312) comprising: - a transparent or translucent strip (30, 130, 230, 330) extending along a longitudinal axis and comprising, on its upper face thereof, a plurality of colour-changing reactive elements (32, 132, 232, 332) which are arranged one after the other along the longitudinal axis; - an absorbent assembly (28; 128, 228, 328) extending along the longitudinal axis and comprising o a biological liquid deposition portion (37, 137, 237, 337); o a biological liquid diffusion band (38, 138, 238, 338) arranged over the plurality of reactive elements (32, 132, 232, 332); - a housing (16, 116, 216, 316) extending along the longitudinal axis between two lateral ends, the housing (16, 116, 216) comprising: o a housing bottom (24, 124, 224, 324), the strip (30, 130, 230, 330) being arranged in the housing bottom (24, 124, 224, 324), the lower face of the strip (30, 130, 230, 330) being arranged opposite the housing bottom (24, 124, 224, 324), each reactive element (32, 132, 232, 332) being arranged by transparency through the strip (30, 130, 230, 330) facing an opening (52, 152, 252, 352) of the housing bottom (24, 124, 224, 324); o an upper cover (26, 126, 226, 326) arranged over the diffusion band (38, 138, 238), and comprising at least one protruding pattern (60, 172, 288) forming a first bearing surface configured to press the diffusion band (38, 138, 238, 338) into contact with the plurality of reactive elements (32, 132, 232, 332); o an access opening (56, 156, 256, 356) configured to provide access the biological liquid deposition portion (37, 137, 237, 337). - a transparent or translucent strip (30, 130, 230, 330) extending along a longitudinal axis and comprising, on its upper face thereof, a plurality of colour-changing reactive elements (32, 132, 232, 332) which are arranged one after the other along the longitudinal axis; - an absorbent assembly (28; 128, 228, 328) extending along the longitudinal axis and comprising o a biological liquid deposition portion (37, 137, 237, 337); o a biological liquid diffusion band (38, 138, 238, 338) arranged over the plurality of reactive elements (32, 132, 232, 332); o a biological liquid deposition portion (37, 137, 237, 337); o a biological liquid diffusion band (38, 138, 238, 338) arranged over the plurality of reactive elements (32, 132, 232, 332); - a housing (16, 116, 216, 316) extending along the longitudinal axis between two lateral ends, the housing (16, 116, 216) comprising: o a housing bottom (24, 124, 224, 324), the strip (30, 130, 230, 330) being arranged in the housing bottom (24, 124, 224, 324), the lower face of the strip (30, 130, 230, 330) being arranged opposite the housing bottom (24, 124, 224, 324), each reactive element (32, 132, 232, 332) being arranged by transparency through the strip (30, 130, 230, 330) facing an opening (52, 152, 252, 352) of the housing bottom (24, 124, 224, 324); o an upper cover (26, 126, 226, 326) arranged over the diffusion band (38, 138, 238), and comprising at least one protruding pattern (60, 172, 288) forming a first bearing surface configured to press the diffusion band (38, 138, 238, 338) into contact with the plurality of reactive elements (32, 132, 232, 332); o an access opening (56, 156, 256, 356) configured to provide access the biological liquid deposition portion (37, 137, 237, 337). o a housing bottom (24, 124, 224, 324), the strip (30, 130, 230, 330) being arranged in the housing bottom (24, 124, 224, 324), the lower face of the strip (30, 130, 230, 330) being arranged opposite the housing bottom (24, 124, 224, 324), each reactive element (32, 132, 232, 332) being arranged by transparency through the strip (30, 130, 230, 330) facing an opening (52, 152, 252, 352) of the housing bottom (24, 124, 224, 324); o an upper cover (26, 126, 226, 326) arranged over the diffusion band (38, 138, 238), and comprising at least one protruding pattern (60, 172, 288) forming a first bearing surface configured to press the diffusion band (38, 138, 238, 338) into contact with the plurality of reactive elements (32, 132, 232, 332); o an access opening (56, 156, 256, 356) configured to provide access the biological liquid deposition portion (37, 137, 237, 337).