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Hi there. Thank you for your question. I will be helping you out with your queries
also, can saliva tests be substituted for the blood tests?
No, the standard criterion are blood tests.
Regulations vary from one place to another on the frequency of testing.
Where are you located?
this is a free trial isn't it?
Tests are recommended at least six months to one year interval.
is that yes or no?
I am just an expert on this site.
So I am not aware of the free trial.
You can confirm this information from the website administration.
testing can be performed earlier if there is no use of protection.