I thought I might have another go at the BTLP-TACT website. I was presented with two cases:
80914 – a seventy-one year old woman undergoing a fem-pop bypass requiring group and save
She grouped as A Rh(D) Positive with a negative antibody screen
13687 – an eighty year old chap in theatre requiring four units of blood immediately.
He grouped as AB Negative with a negative antibody screen. I selected four units of A Rh(D) Negative blood for him.
I got the green light.