Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

Why does the control line sometimes appear very weak while the test line is positive?

April 26, 2017appear CONTROL line positive Test weak

0

Posted

Why does the control line sometimes appear very weak while the test line is positive?

1 Answer

0

Posted

Control line is aimed to ensure that chromatography has been performed up to the top of the strip. It is not related with the result of the diagnostic itself.Control line may sometimes be “very weak” when the sample is highly positive. Signal on the control line comes from the remaining conjugate that didn’t react with the antigen on the specific live. More positive will be the specific signal, less positive will be the signal on the control line.The control line confirms that migration proceeded successfully even if the line is only slightly rose or dark red.