Everybody's Anemic Until Proven Otherwise

Your patient is tired, pale, and short of breath, and three different attendings have already blamed anxiety. They are all wrong. The blood is lying to you in six different ways at once, and if you cannot tell a sickle cell crisis from a clotting factory that has gone rogue, someone dies of something that had a checklist. This is the blood unit. Pay attention or don't, but somebody's oxygen delivery depends on it.