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How does a urinalysis strip work?

A urinalysis strip (dipstick) is a narrow plastic strip that has several square-shaped pads of different colors attached to it. Each small pad represents a chemical parameter (a component of the test) used to interpret urinalysis. When dipped in the urine, pad colors change in response to the chemical characteristics of the urine. The color changes are noted at specific time intervals and compared against the reference color chart/key.

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