It seems that a physician's endorsement is required. Our doctor has agreed to take the samples (for Mrs. subtr4ct and our daughter) at his office, and we will take them to FedEx ourselves (if its okay the doctor's office). The samples need to be in Reno within 24 hours. On a related note -- you will need to give your sample not too late in the week so that it will arrive in Reno on a working day. The real question for us is: when will we get the test kits!?!? Our request was acknowledged on Jan 28., at which time we were told to expect a 6 to 8 week wait. Nothing yet.