| Pathology biopsy report | Bone marrow | Pathology | LP401944-6 | 1 |
| Pelger Huet cells | LP19282-0 | 1 |
| Pelger Huet cells | Blood | Hematology and Cell counts | LP392869-6 | 1 |
| Pemptoporphyrin | LP173710-7 | 1 |
| Pemptoporphyrin | Stool | Chemistry - non-challenge | LP386486-7 | 1 |
| Pencil cells | LP14573-7 | 1 |
| Pencil cells | Blood | Hematology and Cell counts | LP393415-7 | 1 |
| Pentacarboxylporphyrin I | Stool | Chemistry - non-challenge | LP386496-6 | 1 |
| Pentacarboxylporphyrin III | Stool | Chemistry - non-challenge | LP386497-4 | 1 |
| Pentadecanoate | LP62170-3 | 1 |
| Pentadecanoate | Red Blood Cells | Chemistry - non-challenge | LP382185-9 | 1 |
| pH | Body fluid | Chemistry - non-challenge | LP383439-9 | 1 |
| pH | Dialysis fluid | Chemistry - non-challenge | LP383441-5 | 1 |
| pH | Gastric fluid | Chemistry - non-challenge | LP383443-1 | 1 |
| pH | Lower respiratory specimen | Chemistry - non-challenge | LP383448-0 | 1 |
| pH | Semen | Chemistry - non-challenge | LP383450-6 | 1 |
| pH | Stool | Chemistry - non-challenge | LP383452-2 | 1 |
| Phencyclidine | Meconium | Drug toxicology | LP390188-3 | 1 |
| PHENobarbital | LP14729-5 | 1 |
| PHENobarbital | Serum or Plasma | Drug toxicology | LP390728-6 | 1 |
| Phenylacetate | LP18450-4 | 1 |
| Phenylacetylcarnitine (PheC2) | LP70092-9 | 1 |
| Phenylacetylcarnitine (PheC2) | DBS | Chemistry - non-challenge | LP381994-5 | 1 |
| Phenylalanine | Amniotic fluid | Chemistry - non-challenge | LP384223-6 | 1 |
| Phenylalanine | Cerebral spinal fluid | Chemistry - non-challenge | LP384227-7 | 1 |
| Phenylalanine | Serum or Plasma | Chemistry - non-challenge | LP384229-3 | 1 |
| Phenylketonuria and variants/Biopterin defects | LP56749-2 | 1 |
| Phenylketonuria and variants/Biopterin defects | DBS | Chemistry - non-challenge | LP385849-7 | 1 |
| Phenyllactate | LP18451-2 | 1 |
| Phenyllactate | Urine | Chemistry - non-challenge | LP384247-5 | 1 |
| Phenylpyruvate | Urine | Chemistry - non-challenge | LP385816-6 | 1 |
| Phenytoin | Serum or Plasma | Drug toxicology | LP390830-0 | 1 |
| Phenytoin Free | LP14731-1 | 1 |
| Phenytoin Free | Serum or Plasma | Drug toxicology | LP390836-7 | 1 |
| Phosphate | Calculus (stone) | Chemistry - non-challenge | LP386046-9 | 1 |
| Phosphate | Dialysis fluid | Chemistry - non-challenge | LP386048-5 | 1 |
| Phosphate | Dialysis fluid peritoneal | Chemistry - non-challenge | LP386049-3 | 1 |
| Phosphate | Serum or Plasma | Chemistry - non-challenge | LP386057-6 | 1 |
| Phosphate | Stool | Chemistry - non-challenge | LP386058-4 | 1 |
| Phosphoethanolamine | Amniotic fluid | Chemistry - non-challenge | LP384249-1 | 1 |
| Phosphoethanolamine | Cerebral spinal fluid | Chemistry - non-challenge | LP384252-5 | 1 |
| Phosphoethanolamine | Serum or Plasma | Chemistry - non-challenge | LP384253-3 | 1 |
| Phosphofructokinase | LP15038-0 | 1 |
| Phosphofructokinase | Red Blood Cells | Chemistry - non-challenge | LP383171-8 | 1 |
| Phosphoglycerate kinase | LP15039-8 | 1 |
| Phosphoglycerate kinase | Red Blood Cells | Chemistry - non-challenge | LP383179-1 | 1 |
| Phosphomannomutase 1 | LP199552-3 | 1 |
| Phosphomannomutase 1 | White blood cells | Chemistry - non-challenge | LP383183-3 | 1 |
| Phosphoserine | Amniotic fluid | Chemistry - non-challenge | LP384256-6 | 1 |
| Phosphoserine | Cerebral spinal fluid | Chemistry - non-challenge | LP384258-2 | 1 |
| Phosphoserine | Serum or Plasma | Chemistry - non-challenge | LP384259-0 | 1 |
| Phytanate (C16:0(CH3)4) | LP15807-8 | 1 |
| Phytanate (C16:0(CH3)4) | Serum or Plasma | Chemistry - non-challenge | LP382198-2 | 1 |
| Phytonadione | LP17945-4 | 1 |
| Phytonadione | Serum or Plasma | Chemistry - non-challenge | LP385214-4 | 1 |
| Pipecolate | Cerebral spinal fluid | Chemistry - non-challenge | LP384264-0 | 1 |
| Pipecolate | Serum or Plasma | Chemistry - non-challenge | LP384265-7 | 1 |
| Placental growth factor | LP182306-3 | 1 |
| Placental growth factor | Serum | Chemistry - non-challenge | LP385003-1 | 1 |
| Plasma cells monotypic population | LP249103-5 | 1 |
| Plasma cells monotypic population | Bone marrow | Hematology and Cell counts | LP411472-6 | 1 |
| Plasmodium sp | LP14840-0 | 1 |
| Plasmodium sp | Blood | Microbiology | LP376833-2 | 1 |
| Platelet clump | LP17683-1 | 1 |
| Platelet clump | Blood | Hematology and Cell counts | LP393380-3 | 1 |
| Platelet satellitism | LP19283-8 | 1 |
| Platelet satellitism | Blood | Hematology and Cell counts | LP393378-7 | 1 |
| Plateletcrit | LP66393-7 | 1 |
| Plateletcrit | Blood | Hematology and Cell counts | LP392496-8 | 1 |
| Platelets | Blood cord | Hematology and Cell counts | LP393220-1 | 1 |
| Platelets | Platelet rich plasma | Hematology and Cell counts | LP393225-0 | 1 |
| Platelets agranular | LP30827-7 | 1 |
| Platelets agranular | Blood | Hematology and Cell counts | LP393228-4 | 1 |
| Platelets Small | LP29183-8 | 1 |
| Platelets Small | Blood | Hematology and Cell counts | LP393230-0 | 1 |
| Pneumocystis jirovecii | LP17137-8 | 1 |
| Pneumocystis jirovecii | XXX | Microbiology | LP376421-6 | 1 |
| Pneumocystis sp | LP14842-6 | 1 |
| Poikilocytosis | LP30906-9 | 1 |
| Poikilocytosis | Blood | Hematology and Cell counts | LP393417-3 | 1 |
| Polychlorinated biphenyl (PCB) | LP16832-5 | 1 |
| Polychlorinated biphenyl (PCB) | Serum or Plasma | Drug toxicology | LP387715-8 | 1 |
| Polychromasia | LP14574-5 | 1 |
| Polychromasia | Blood | Hematology and Cell counts | LP393447-0 | 1 |
| Polyunsaturated fatty acids | Serum or Plasma | Chemistry - non-challenge | LP382108-1 | 1 |
| Pompe disease | LP113909-8 | 1 |
| Pompe disease | DBS | Chemistry - non-challenge | LP421938-4 | 1 |
| Porphobilinogen | Serum or Plasma | Chemistry - non-challenge | LP386501-3 | 1 |
| Porphyrin fractions | LP36361-1 | 1 |
| Porphyrin fractions | Urine | Chemistry - non-challenge | LP386505-4 | 1 |
| Porphyrins | Urine | Chemistry - non-challenge | LP386411-5 | 1 |
| Potassium | Blood arterial | Chemistry - non-challenge | LP386602-9 | 1 |
| Potassium | Blood capillary | Chemistry - non-challenge | LP386603-7 | 1 |
| Potassium | Blood mixed venous | Chemistry - non-challenge | LP386604-5 | 1 |
| Potassium | Blood venous | Chemistry - non-challenge | LP386605-2 | 1 |
| Potassium | Body fluid | Chemistry - non-challenge | LP386606-0 | 1 |
| Potassium | Cerebral spinal fluid | Chemistry - non-challenge | LP386607-8 | 1 |
| Potassium | Dialysis fluid | Chemistry - non-challenge | LP386608-6 | 1 |
| Potassium | Dialysis fluid peritoneal | Chemistry - non-challenge | LP386609-4 | 1 |
| Potassium | Hair | Chemistry - non-challenge | LP386611-0 | 1 |