| TSR | theophylline sustained release; thyroid to serum ratio; total systemic resistance |
|---|---|
| TST | thiosulfate sulfur-transferase; thromboplastin screening test; total sleep time; transforming sequen... |
| TU | thiouracil; thyroid uptake; Todd unit; toxin unit; transmission unit; transurethral; tuberculin unit... |
| TyRIA | thyroid radioisotope assay |