Last summer, the New York Times reported that CTs above 34 almost never detect live virus but most often, dead nucleotides that are not contagious. The Sentinel found that many private labs in Kansas used thresholds of 38 and 40, and another one in Lenexa potentially at 45. The state lab at the Kansas Department of Health initially used a 42 CT on its most commonly performed test; on January 7, they reduced it to 35.

Questions posed to KDHE about their current CT level have not been answered at press time.

https://sentinelksmo.org/cdc-maximum-28-ct-for-post-vaccine-covid-pcr-tests/