| PSA |
| Pyrazinamide (drug abuse) |
| Pyrethroid (drug abuse) |
| Pap smear (cytology) |
| Pap smear (cytology) |
| Papp-A |
| Parvovirus B19 Ab (IgG) |
| Parvovirus B19 Ab (IgM) |
| Parvovirus PCR |
| Pathergy test |
| Paul Bunnell |
| Pedicularis test |
| Pericardial fluid culture |
| Phenobarbital |
| Phenylalanine |
| Phenytoin |
| Phosphorus |
| PKU |
| Pleural fluid culture |
| PML /RAR PCR-AML-3 |
| Pneumonia Ab (IgG) |
| Pneumonia Ab (IgG2) |
| Porphyrines |
| PCT (Post coital test) |
| Potassium |
| Pregnancy test |
| Primidone |
| Progesterone |
| Prolactin |
| Procalcitonin |
| Prostatic dis. Culture |
| Protein C |
| Protein S |
| Protein electrophoresis |
| Pro BNP-NT |
| Protein total |
| PT (prothrombin time) |
| PTH |
| PTH (1-84) |
| Pyruvate |
| Perphenazine (drug abuse) |
| Pethidine (drug abuse) |
| Phencyclidine (drug abuse) |
| Phenobarbital (drug abuse) |
| Phenytoin(drug abuse) |
| Phosphide (drug abuse) |
| Phosphorus (drug abuse) |
| Pimozide (drug abuse) |
| Piroxicam (drug abuse) |
| Primidone (drug abuse) |
