Hi Charlotte, unfortunately I know nothing about your dads situation as have no experience of it but have bumped the message back to the top for you and hopefully someone will give suggestions or help.
You are on the best site for help and information so stick with it and try to give as much info back to get the best response.
I hope your dad will be ok and the blood tests will give your specialists the right info for the best treatment, I think sometimes things change and have to be reviewed.
Keep posting, regards Chris/woody
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