What does CT 40, 35, 30, etc mean?
Cycle threshold,  it’s the sensitivity of the test.  

At 40, if after 40 cycles they can’t detect COVID, they stop the test and mark it negative 

Below 40 means you have it in your system. But they can’t know if it’s a new infection or just the remaining of previous. They have to isolate you and out you in quarantine if they don’t know and can validate your medical history 

If you tests 39, for example, you could go down to 25 or less in the next few days

If you are below 30 you are very contagious And below 25 you are very sick 

Home rapid tests only detect 25 or 30 and under.  

But if you don’t have history of having tested positive in China, they will use 40 for your first test

You have to be 30 and over to be ok, below 30 is still treated as contagious. #Going to China (Pandemic Travel) #China Covid Curated

Going to China (Pandemic Travel)

China Covid Curated

What does CT 40, 35, 30, etc mean? Cycle threshold,  it’s the sensitivity of the test.    At 40, if after 40 cycles they can’t detect COVID, they stop the test and mark it negative   Below 40 means you have it in your system. But they can’t know if it’s a new infection or just the remaining of previous. They have to isolate you and out you in quarantine if they don’t know and can validate your medical history   If you tests 39, for example, you could go down to 25 or less in the next few days  If you are below 30 you are very contagious And below 25 you are very sick   Home rapid tests only detect 25 or 30 and under.    But if you don’t have history of having tested positive in China, they will use 40 for your first test  You have to be 30 and over to be ok, below 30 is still treated as contagious. #Going to China (Pandemic Travel) #China Covid Curated

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