We never rely on patients telling us their blood tyoe, or even past lab results. A test must have been performed recently (in my hospital it’s within the last seven days) for the blood bank to dispense blood.

If there is a major haemorrhage the patient will receive the universal donor (O-) while the test for definitive blood type is performed.

Doubtful. The risk of giving the wrong blood is so high that the hospital should only rely on a test done right then and there.

Nope. I've been to the ER with a head wound that would not stop bleeding, and was never asked for my blood type.

Had they asked, I would have given the wrong answer. My blood was typed when I was born. 25 years later when I started donating blood, I was typed again -- and told a different type.

My physicians and phlebotomists assure me blood type cannot change, and old blood tests were simply not very accurate. I don't know any lab or clinic that trusts what someone else claims about blood type.

I did exactly this, went to Quest diagnostics from an online thing and in the end they don’t give you the blood type or Rh factor. It’s just a standard test for various STIs etc.

It’s most likely he doesn’t know. Order that test would be very strange for a PCP. Typically you’re only getting typed and screened if you’re about to surgery/birth/donate. This is so they can act quick to transfuse you if needed or know who to give your donated blood to. You need to ask your doctor to order this test for you and tell them your ok paying for it because it won’t get approved without reason. From a PCP perspective, he’s monitoring your cholesterol, blood counts, etc. knowing your blood type has no medical significance to him.

Any more information about how and where I'd go about this?

Where I'm from, it's done at birth, it's just a standard part of a medical registration package thing your parents get. My parents kept my bloodtype card right next to my childhood vaccination records.

It's not like your bloodtype changes over time...