Method and apparatus for improving usability and accuracy for physiological measurement on mobile device

An accessory for a computing device to measure characteristics of a test strip, the accessory comprising:

• a test strip adapter comprising a test strip attachment for a test strip type, and a first interlock shared with other test strip adapters for other test strip types, and a test strip carrier including a top half defining a sample collector and a bottom half defining a test strip opening to the test strip;
• and
• a coupler, coupled to the computing device, comprising:
• a second interlock that forms a first mating pair with the first interlock of the test strip adapter;
• and
• a light guide having an input surface, wherein the coupler defines a screen opening to a portion of a screen of the computing device and the input surface is aligned over the screen opening.

A device to measure characteristics of a test strip, the device comprising:

• a computing device with a display;
• a test strip adapter comprising a test strip attachment for a test strip type, and a first interlock shared with other test strip adapters for other test strip types, and a test strip carrier including a top half defining a sample collector and a bottom half defining a test strip opening to the test strip;
• and
• a coupler, coupled to the computing device, comprising:
• a second interlock that forms a first mating pair with the first interlock of the test strip adapter;
• and
• a light guide having an input surface, wherein the coupler defines a screen opening to a portion of the display and the input surface is aligned over the screen opening.