| 3025 | Packed Cell Volume |
| 91172 | Pamelor |
| 91445 | Pancreatic Elastase, Fecal |
| 91139 | Papillomavirus |
| 2473 | Parainfluenza Antibodies 1,2,3 [DFA] |
| 3121 | Parasite Blood Smear |
| 4640 | Parasite Identification |
| 91323 | Parathyroid Hormone Related Peptide |
| 5026 | Parathyroid Hormone, Intact |
| 2359 | Parietal Cell Antibody |
| 91177 | Paroxetine |
| 3505 | Partial Thromboplastin Time |
| 3560 | Partial Thromboplastin Time 1:1 Mixing Study |
| 91178 | Parvovirus B 19 Antibodies, IgG/IgM |
| 91177 | Paxil |
| 91181 | PCB's |
| 91316 | PCP |
| 80804 | Pediatric Food Panel |
| 80802 | Pediatric Panel |
| 2064 | Peptide |
| 4031 | Pertussis, Culture |
| 4043 | Pertussis, DFA |
| 91319 | Pertussis, PCR |
| 2138 | PG, Amniotic |
| 4612 | pH, Feces |
| 91316 | Phencyclidine, GCMS |
| 2121 | Phenobarbital |
| 2114 | Phenytoin |
| 91179 | Phenytoin, Free and Total |
| 1011 | Phosphatase, Alkaline |
| 91382 | Phosphatase, Alkaline Isoenzymes |
| 1103 | Phosphate |
| 1012 | Phosphate, inorganic |
| 2138 | Phosphatidylglycerol |
| 91293 | Phosphatidylserine Abs, IgGAM |
| 1012 | Phosphorus, Inorganic |
| 1103 | Phosphorus, Urine Quant |
| 4620 | Pinworm Tape Test |
| 91402 | PLAC |
| 91401 | Plasminogen Activity |
| 91180 | Platelet Antibody, Direct |
| 91263 | Platelet Antibody, Indirect |
| 3510 | Platelet Count |
| 3510 | PLT |
| 91267 | Pneumonitis |
| 1012 | PO4 |
| 91181 | Polychlorinated Biphenyls, Serum |
| 91182 | Porphobilinogen, Urine Quantitative |
| 91183 | Porphyrins, Fecal |
| 91342 | Porphyrins, Urine Fractionated |
| 3343 | Porphyrins, Urine Qualitative |
| 1027 | Potassium, Serum or Plasma |
| 1102 | Potassium, Urine Quant |
| 2461 | PR3 |
| 2384 | Prealbumin, Serum |
| 2130 | Pregnancy Test, Qual [Serum] |
| 2336 | Pregnancy Test, Qual [Urine] |
| 2135 | Pregnancy Test, Quant [Serum] |
| 91184 | Pregnenolone |
| 1474 | Prenatal Panel I |
| 14121 | Prenatal Panel I + HIV |
| 91011 | Prenatal Quad Panel |
| 91010 | Prenatal Risk Panel [Triple Marker] |
| 2115 | Primidone [Includes Phenobarbital] |
| 2620 | proBNP |
| 91420 | Procainamide + NAPA |
| 2300 | Progesterone |
| 91185 | Proinsulin |
| 2131 | Prolactin |
| 91186 | Propafenone |
| 91318 | Propoxyphene, GCMS |
| 1486 | Prostate Panel |
| 2147 | Prostate Specific Antigen |
| 2293 | Prostate Specific Antigen, MC Screening |
| 2232 | Prostate Specific Antigen, Total w/Reflex |
| 2060 | Prostatic Acid Phosphatase |
| 91450 | Prostatic Specific Antigen |
| 1020 | Protein |
| 1135 | Protein / Creatinine Ratio, Urine |
| 91023 | Protein C Resistance |
| 2641 | Protein C, Functional |
| 91188 | Protein C, Total Antigen |
| 91189 | Protein Electrophoresis, CSF |
| 2075 | Protein Electrophoresis, Serum |
| 2141 | Protein Electrophoresis, Urine |
| 2642 | Protein S, Functional |
| 91191 | Protein S, Total Antigen |
| 2047 | Protein, CSF |
| 2043 | Protein, Urine Quant |
| 2461 | Proteinase 3 |
| 91192 | Prothrombin Gene Mutation |
| 3500 | Prothrombin Time |
| 3540 | Prothrombin Time 1:1 Mixing Study |
| 3500 | Protime |
| 3540 | Protime 1:1 Mixing Study |
| 2147 | PSA |
| 2293 | PSA, MC Screening |
| 2232 | PSA, Total w/Reflex |
| 91450 | PSA, Ultrasensitive |
| 91193 | Pseudocholinesterase, Total |
| 3500 | PT |
| 3540 | PT 1:1 Mixing Study |
| 91192 | PT Gene Mutation |
| 5026 | PTH |
| 91323 | PTH Related Peptide |
| 3505 | PTT |
| 3560 | PTT 1:1 Mixing Study |
| 91395 | Pyridium Crosslinks |
| 91228 | Pyridoxine |
| 91195 | Pyruvate Kinase |