Thailand *********************************
ORIGINAL POSTER@Nigel ********
Hi Nigel, Donate at a local red cross. They will tell you on the spot.
Now, some blood banks may not test for Rh immediately as Rh- is so so rare here... they may not have a bottle of the reagent open. (the liquid that tests for a reaction)
But it will be tested later. And you can follow up with them later.
Alternatively, you can buy your own self test kit. It's an expensive option and I understand that the reagents must remain refrigerated.