Pneumonia Severity Index

While community acquired pneumonia (CAP) is ‘bread and butter’ emergency medicine, and the diagnosis is often a ‘slam dunk’, it turns out that up one third of the time, we are wrong about the diagnosis; that x-rays are not perfect; that blood work is seldom helpful; that not all antibiotics are created equal and that deciding who can go home and who needs to go to the ICU isn’t always so clear cut.