A testing system (10, 210, 310) adapted to determine a concentration of an analyte, the testing system (10, 210, 310) comprising: a user interface including a plurality of visual indicators (20, 24, 28, 220, 324, 320); a lighting element (102, 232, 332) operative to emit light of a plurality of wavelengths corresponding to a plurality of colors; a primary light guide (106, 236, 336) coupled to the lighting element (102, 232, 332) and configured to transmit light emitted by the lighting element (102, 232, 332); a plurality of secondary light guides (110, 114, 118, 248, 344, 348) configured to transmit light emitted by the lighting element (102, 232, 332) and transmitted by the primary guide (106, 236, 336); and a plurality of filters (122, 126, 130, 280, 356, 360), each filter of the plurality of filters (122, 126, 130, 280, 356, 360) being coupled to a separate secondary light guide of the plurality of secondary light guides (110, 114, 118, 248, 344, 348), each filter of the plurality of filters (122, 126, 130, 280, 356, 360) corresponding to a separate visual indicator of a plurality of visual indicators (20, 24, 28, 220, 324, 320), and each filter of the plurality of filters (122, 126, 130, 280, 356, 360) being configured to filter light transmitted by the primary light guide (106, 236, 336), wherein the plurality of filters (122, 126, 130, 280, 356, 360) includes a first filter (122, 280, 356) coupled to a first one (28, 220, 324) of the plurality of visual indicators (20, 24, 28, 220, 324, 320) and configured to filter light of a first wavelength transmitted by the primary light guide (106, 236, 336), and a second filter (126, 360) coupled to a second one (24, 320) of the plurality of visual indicators (20, 24, 28, 220, 324, 320) and configured to filter light of the first wavelength transmitted by the primary light guide (106, 236, 336). a user interface including a plurality of visual indicators (20, 24, 28, 220, 324, 320); a lighting element (102, 232, 332) operative to emit light of a plurality of wavelengths corresponding to a plurality of colors; a primary light guide (106, 236, 336) coupled to the lighting element (102, 232, 332) and configured to transmit light emitted by the lighting element (102, 232, 332); a plurality of secondary light guides (110, 114, 118, 248, 344, 348) configured to transmit light emitted by the lighting element (102, 232, 332) and transmitted by the primary guide (106, 236, 336); and a plurality of filters (122, 126, 130, 280, 356, 360), each filter of the plurality of filters (122, 126, 130, 280, 356, 360) being coupled to a separate secondary light guide of the plurality of secondary light guides (110, 114, 118, 248, 344, 348), each filter of the plurality of filters (122, 126, 130, 280, 356, 360) corresponding to a separate visual indicator of a plurality of visual indicators (20, 24, 28, 220, 324, 320), and each filter of the plurality of filters (122, 126, 130, 280, 356, 360) being configured to filter light transmitted by the primary light guide (106, 236, 336), wherein the plurality of filters (122, 126, 130, 280, 356, 360) includes a first filter (122, 280, 356) coupled to a first one (28, 220, 324) of the plurality of visual indicators (20, 24, 28, 220, 324, 320) and configured to filter light of a first wavelength transmitted by the primary light guide (106, 236, 336), and a second filter (126, 360) coupled to a second one (24, 320) of the plurality of visual indicators (20, 24, 28, 220, 324, 320) and configured to filter light of the first wavelength transmitted by the primary light guide (106, 236, 336).