- P120
 - P16
 - 
							P40 (
ANTI-p40
) - 
							P501S (
Prostein
) - 
							P504S (
AMACR, methyl co-A racemase
) - P53
 - 
							P57 (
Hydatidiform mole, Hydatidiform mole panel
) - P63
 - 
							Pancreas (
Pancreatic duct, ampulla, common duct, FNA
) - 
							Pap Test, ThinPrep® (
Liquid Pap, Cytc, Hologic
) - 
							PAS-D for Fungus (
PAS with Diastase, Nail PAS, Nail fungus, Nail, Fingernail, Toenail, Fungal stain
) - 
							PAS-D Stain (BAL) (
Bronchoalveolar Lavage for Pulmonary Alveolar Proteinosis, BAL, lung fluid
) - PAX5
 - PAX8
 - 
							PD-1 (
Programmed Death-1
) - Perforin
 - 
							Pericardium (
Heart, pericardial effusion
) - 
							Periodic Acid Schiff's Stain (
PAS, PAS Stain
) - 
							Peritoneal/Pericolic gutter washings (
Colon, abdomen
) - 
							Peritoneum (
Ascites/Peritoneal effusion, abdominal fluid
) - 
							PHH3 (
Phosphohiston H3
) - 
							PIN 3 (TRICAP) - P504S, P63, CKHMW Cocktail (
Basal Cell Cancer Cocktail
) - 
							Placental Alkaline Phoshatase (
PLAP
) - 
							PML/RARA FISH Probe, t(15;17), Acute myeloid leukemia (AML),  Acute Promyelocytic Leukemia (APL) (
AML, APL, t(15;17)
) - 
							PMS2 (
Microsatellite Instability Panel
) - 
							PNH (
Paroxysmal Nocturnal Hemoglobinuria, High Sensitivity PNH, Flow Cytometry
) - PRAME Antibody
 - 
							Progesterone Receptor (
PR, PgR
) - Prolactin IHC Stain
 - 
							Prostate Acid Phosphatase (
PSAP
) - 
							Prostate Specific Antigen (
PSA
)