| ATT | arginine tolerance test; aspirin tolerance time |
|---|---|
| ETT | endotracheal tube; epinephrine tolerance test; exercise tolerance test; exercise treadmill test; ext... |
| LTT | lactose tolerance test; leucine tolerance test; limited treadmill test; lymphocyte transformation te... |
| HF | Hageman factor; haplotype frequency; hard filled [capsule]; hay fever; head of fetus; head forward; ... |
| HPLC | high-performance liquid chromatography; high-power liquid chromatography; high-pressure liquid chrom... |