cycle threshold value

Ct值高於33-35︰病毒載量較低但在可檢測的範圍內

目前，Ct值不應被用來定義傳染性或顯示無傳播風險。

Ct = 循環閾值，該值與病毒載量成反比，Ct值越高表示病毒載量越低。

CDC. (2020, May 3). COVID-19感染者中止居家隔離的策略 (基於症狀). https://chinese.cdc.gov/coronavirus/2019-ncov/community/strategy-discontinue-isolation.html

Ct levels are inversely proportional to the amount of target nucleic acid in the sample.

University of Wisconsin-Madison. (2013, January). Real Time PCR Ct Values. https://www.wvdl.wisc.edu/wp-content/uploads/2013/01/WVDL.Info_.PCR_Ct_Values1.pdf