| PPD | Paired-pulse depression |
|---|---|
| PPD | Para-phenylenediamine |
| PPD | Pocket Probing Depth |
| PPD | Postpartum depression |
| PPD | Preprodynorphin |
| PPD | Probing Pocket Depth |
| PPD | Purified Protein Derivate |
| PPD | Purified Protein Derivative |
| PPD | Purified Protein Derivative of Tuberculin |
| PPD | proximal pars distalis |