| PNB | p-nitrobiphenyl; perineal needle biopsy; peripheral nerve block; premature nodal beat |
|---|---|
| PTBNA | protected transbronchial needle aspirate |
| TTNB | transthoracic needle biopsy |
| NTA | 1) Naso-Tracheal Aspiration 2) National Tuberculosis Association |
| TTA | Trans-Tracheal Aspiration |