Where to get a medical done for Latvian Driving License

Hi, I have a UK driving license and wish to exchange it for a Latvian one. It says it is easy to do but there is the requirement of a medical examination.
My question is  where do I get that done? I have a family GP, can I go there and ask them to complete a form? Will they have that form? Or should I get one and take it to them?
Would be grateful for some guidance in this matter,
Thanks

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