16 January 2026 (Friday) - Sub Types of A

Here’s an interesting little read about sub-types of the A blood group which got me thinking. Back in the day sub-types of the A blood group were a big thing. We’d often find the weak reacting A₂ with the anti-A₁. We hardly see them any more because the anti-A reagents are far better these days, and because the buildings we work in now correspond to more stringent building regulations and aren’t anywhere near cold enough for the cold-reacting anti-A₁ to show itself.

Those sub-types are still there… we just don’t notice them anywhere near as often as we used to. Is that an issue? Demonstrably not.