What are the causes when a test is invalid or no read?

If no lines show after 5 to 10 minutes the test is called invalid. A probable cause for an invalid test could be a defect in device—the strips may not be inserted all the way to the bottom of the panel. Or it could be caused by improper handling of the testing device and insufficient sample amount that could not saturate the stripes, resulting in no contact between the test strip and the specimen. If this happens, the lot number should be provided to the quality control department to review batch production records.

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