We use a second sample collected at a different time to confirm type "no previous records" unless they type as O. If we can not get a second sample before blood is needed, we issue type O. This does not happen often.
I failed the SBB exam the first time I took it too. But, I passed the second time around. It is much easier the second time around knowing what to expect. Don't give up!
We use a 4 hour expiration for anything that is put in a syringe.
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