Biological Markers / Agents

Pancreatic polypeptide Pantothenic acid (Vitamin B5) Para-aminobenzoic acid Parainfluenza Virus Serology (Specific Antibodies for Parainfluenza Virus) Parathyroid hormone (PTH, Parathormone) Paroxysmal Nocturnal Hemoglobinuria Partial Pressure of Arterial Carbon Dioxide (PaCO2) Partial Pressure of Arterial Oxygen (PaO2) Peak Expiratory Flow Rate (PEFR) Peak Inspiratory Flow Rate (PIFR) Pentose, phosphorated Percentage NaCl at which Hemolysis begins Percentage NaCl at which Hemolysis is complete Phenol, free Phenylalanine Phenylalanine (Urine) Phosphate (PO4, Phosphorus, P) Phosphoethanolamine (Urine) Phospholipid Phosphoserine (Urine) Phytanic acid Plasma Cells Plasma Clot Lysis Time Plasma thromboplastin antecedent Plasminogen Plasmodium Falciparum, Malariae, Vivax or Ovale Smear Positive (Malaria Giemsa Stain Positive) Platelets Polysaccharides, total Porphobilinogen (Blood) Positive Mantoux Test (Reactive Tuberculin Test, Localized Skin Induration and Redness) Potassium (K, Blood) Potassium (K, Stools) Prealbumin Pregnanediol (Urine) Pregnanetriol (Urine) Pregnenolone Proaccelerin Proconvertin Progesterone Progesterone (male) Proinsulin Prolactin Prolactin (male) <20 x 10-9 Proline Proline (Urine) Prostaglandins Prostate Specific Antigen (PSA) Protein C Protein S Protein, Total (Blood, Serum) Prothrombin Fragment (F1 plus 2) Prothrombin Time Protoporphyrin Pseudoglobulin I Pseudoglobulin II Purine, total Pyridoxine (Vitamin B6) Pyrimidine nucleotide Pyruvate Kinase (PK) Pyruvic acid