Problem: 2 out of 3 tests from the same lot showed very weak control (c) lines, and no visible test (t) lines.Is this a valid negative test? when my test was read at 15 minutes, the _control_ line was very faint.I retested using another kit from the same lot which also resulted in a very faint control line.Another individual used a third test from the same lot which had a normal dark control line.I followed the test kit instructions accurately to the best of my knowledge.I had used the same brand of test kit previously, and this was the first time i had this issue.Lot#: 221co20217, exp: printed 2022-08-16; fda extended to 05/16/2023 (https://www.Fda.Gov/media/164551/download).
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