Yes! You can. You will be issued a ‘Welcome letter’ with a temporary id which will be valid until you get your Kit with permanent cards and coupons in approximately 7 days. With this temporary Id you can get your discount on the spot PROVIDED you have an appointment to have the test done.
Moreover, you will have to choose between Option 1 and Option 2 of the listed free tests offered as part of the card. If you are unsure about which to choose, but have decided to use the card for free Ultrasound or free X-ray ( for which you have prior appointment), then you have automatically chosen Option 2.
Without appointment, by just purchasing the Medall health card, you are not assured that the test done will be conducted just on purchase of card. Please make sure you have prior appointment for having the test taken at the appropriate center.