When your doctor thinks you might have an infection or an allergy, a simple blood test should give answers within hours. But for much of the world, that test can take days – or never happen at all. The problem is not usually the test itself, but an overlooked step between taking your blood and performing the diagnosis.
In most hospitals in high-income countries, separating plasma from blood is so routine that most people never think about it. A nurse takes your blood, sends it to the lab, and a machine called a centrifuge spins it at high speed to separate the liquid plasma from the cells. Lab staff then look for signs of infection, immune responses or bacteria, and your doctor uses those results to decide on treatment.
But centrifuges need electricity, regular checks and trained staff. When these things are not available or the lab is overwhelmed, testing slows down.
