(T-Detect) I know that I had COVID-19 in the past; why is my T-Detect result negative?

A negative T-Detect response means that a T-cell response to COVID-19 was not detected. This can mean that you have not been exposed to COVID-19, or that you have not yet developed a T-cell response.

If you know that you have been exposed to COVID-19 in the past, a false negative result is possible. False negative results may occur due to laboratory processing or the number of T cells assessed in the provided sample.