| SDU | standard deviation unit; step-down unit |
|---|---|
| STEP | Sequential Test of Educational Programs |
| ET | educational therapy; effective temperature; ejection time; embryo transfer; endothelin; endotoxin; e... |
| ETT | endotracheal tube; epinephrine tolerance test; exercise tolerance test; exercise treadmill test; ext... |
| MET | maximal exercise test; metabolic equivalent of the task; metastasis, metastatic; methionine; midexpi... |