Final answer:
A false positive on Kacey test strips is often caused by delaying the reading of the test result, leading to oxidation of iodide ion by non-glucose substances in the urine.
Step-by-step explanation:
False positives on glucose test strips like Kacey test strips can be attributed to timing errors during the color assessment.Glucose test strips utilize enzymes for catalysis to speed up the reaction time typically taking about 30 seconds for the color change to occur correctly. Reading the strip too soon can lead to a false-negative, while a delayed reading tends to result in a false positive.
The explanation for a false positive lies in the non-catalyzed oxidation of iodide ions by other substances found in urine when the reaction time extends beyond the optimal period. Consequently, it is critical for users of Kacey test strips or similar products to adhere strictly to the specified timing instructions to ensure accurate results.