How long between blood tests?

[Dilbertian]

I've just had a blood test, but left half my paperwork at home so they could only do half the tests. Can I do another test on the same arm tomorrow?

Yes or they could use a different vein. Did they not have paperwork on their screen they could just print off.

Two different sets of tests ordered by two different trusts. Of course the paperwork I left at home was from the other trust, and my trust couldn't access it.