It is preferred by your Pilot Practitioner that you get your tests done within the first month of starting your treatment plan.
You can get your blood tests done any time before your next consultation with your practitioner, and the time frame is dependent on which treatment plan you are on. If you do not get your tests done before your follow-up consultation, your practitioner will not be able to continue your treatment plan.
You can get your tests done before your first order arrives, you do not need to be taking your medication before getting your blood tests done.