Hospital - what blood tests will they do?

Hi all, first post here. I had a stroke just over 3 weeks ago. Whilst I was in hospital, the nurses took a lot of blood samples from me. I’d say 5, possibly six vials taken. When I asked what it was there were going to test for (I asked the Doctor) he said it was to check on the bloods to find a cause, e.g. - and I quote “to check for the right minerals”.
I’m just intrigued what these tests all might be, as I’ve can’t seem to find anything conclusive online. Does anybody know? i remember some of the vials having blue, red and yellow tops. I’m very keen to understand what they were doing. I’m awaiting a date for my follow up session in which said results will be discussed. Many thanks.

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