| TTT | thymol turbidity test; tolbutamide tolerance test; total twitch time; tuberculin tine test |
|---|---|
| VAT | variable antigen type; ventricular accommodation test; ventricular activation time; vesicular amine ... |
| CTH | Chronic Tension Headache |
| (A-a)DN2 | alveolo-arterial nitrogen tension difference |
| AADO2, (a-A) DO2 | arterio-alveolar oxygen tension difference |