| Abbreviation | Definition |
|---|---|
| PDA | Patent Ductus Arteriosus |
| PDA | Posterior Descending Artery |
| PDA | Public Display of Affection |
| PDAI | Perianal Disease Activity Index |
| PDCD | Pituitary Dependent Cushings Disease |
| PDCD | Pyruvate Dehydrogenase Complex Deficiency |
| PDD | Pediatrician Did not Decide |
| PDD | Perfectly Dumbfounded Diagnosis |
| PDD | Pervasive Developmental Disorder |
| PDD | Post Disney Depression |
| PDD | Premenstrual Dysphoric Disorder |
| PDD | Proventricular Dilatation Disease |
| PDD-NOS | Pervasive Developmental Disorder Not Otherwise Specified |
| PDE | Psychoacoustic Detail Error |
| PDFG | Post Dump Feel-Good |
| PDGF | platelet-derived growth factor |
| PDH | Pain Drug Hypnosis |
| PDH | Pituitary-Dependent Hyperadrenocorticism |
| PDH | Prevention of Deafness and Hearing Impairment |
| PDI | Powder For Injection |