| NTD | neural tube defect; nitroblue tetrazolium dye; noise tone difference; 5'-nucleotidase |
|---|---|
| OTT | orotracheal tube |
| PET | peak ejection time; polyethylene terphthalate; poor exercise tolerance; positron emission tomography... |
| PMT | parent management training; phenol O-methyltransferase; photomultiplier tube; Porteus maze test; pre... |
| PTRIA | polystyrene-tube radioimmunoassay |