The little plastic test strips for testing glucose levels appear simple, but are a marvel of modern technology, allowing individuals to effectively manage their diabetes at home. All manufacturers of test strips use essentially the same process and the strips work in the same way. However, each manufacturer incorporates small, proprietary differences that ensure it’s only compatible with the company’s brand of meter.

The laminated test strips are comprised of multiple ultra-thin layers and essentially work by using a blood sample to create an electrochemical reaction. A chemical reaction takes place and is converted into an electrical impulse that’s sent to the meter where it’s read.

Test strips begin with a base of polyester, overlaid with a carbon layer to facilitate conductivity. A micro-thin gold or silver-based layer is added and cut into a printed circuit designed to make an electrical circuit when blood is introduced.

A layer of enzymes and stabilizing chemicals are applied to the end of the test strip that accepts the blood sample. When blood is introduced to the strip, a chemical reaction takes place and converted into an electrical impulse that is then read by the glucose meter and presented as a number on the meter’s readout.

The enzymes and stabilizing chemicals have a specific lifespan. High humidity and extremes in temperature degrade the enzyme and chemicals used, thereby rendering an inaccurate reading and placing users’ health at risk.

Test strips that have exceeded their expiration date can exhibit errors by giving readings that are over or under the actual glucose level. Individuals may use too much or too little insulin to compensate. Manufacturers use different enzymes and chemicals unique to their particular brand. Some test strips may provide better accuracy but have a longer shelf life, while other brands may be slightly less accurate but have a longer expiration date.

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