Your 16-alphanumeric code is printed directly inside your TruAge kit, on the biohazard bag. Enter the barcode’s numbers when prompted during the registration process. You can enter your barcode number either with or without the spaces. In the event that you mailed your kit back before completing registration, you will be able to register your collection tube once it arrives at the lab. When an unregistered sample is received at the lab, you will be sent an email containing your unique barcode at the email address used to place your order. Sample processing will not begin until registration is completed.