2 December 2025 (Tuesday) - Exchange Transfusions

There’s a phrase that is in common use – “exchange transfusion”. It implies that you take out all of someone’s blood because it is in some way sub-standard and exchange it for “decent” stuff. But you can’t just hoik it all out before putting in the good stuff as that would be fatal. Similarly putting the good stuff in one arm whilst taking out the bad from the other will lead to a degree of mixing.

Here’s an article examining the logistics of how it might best be done…