Test Code Procedure 500246 Parathyroid Hormone, Intact (IPTH) (Includes Calcium) 500333 Parathyroid Hormone-Related Peptide (PTHrP) 300995 Pathologist Interpretation   PF4 Antibody - see 300522 - Heparin Induced Platelet Antibody, Immunologic 500638 Phosphorus, Serum 300726 PIVKA-II *RUO*   Plasma Renin Activity - see 500278 - Renin, Plasma 300128 Plasminogen Activator Inhibitor-1 (PAI-1) Antigen 300492 Plasminogen Activator Inhibitor-1 (PAI-1), Deficiency Evaluation (PAI-1 Activity, PAI-1 Antigen, Tissue Plasminogen Activator (TPA) Antigen) 129100 Plasminogen Activator Inhibitor-1, 4G/5G Genotyping *RUO* (PAI-1 polymorphism) 300400 Plasminogen Activity 300408 Plasminogen Antigen 300521 Platelet Antibody Drug-Induced*** 300386 Platelet Antibody, Direct 300504 Platelet Factor 4 300524 Platelet HPA-1a/1b Antibody Identification 300805 Platelet Neutralization Procedure   Platelet Specific Antigen PLA1 (HPA-1a) - see 300531 - HPA-1a (PLA 1 Platelet Antigen Genotyping PLA 2 Polymorphism Detection)   Platelet Specific Antigen-2 (PLA2) Polymorphism (HPA-1b) - see 300531- HPA-1a (PLA 1 Platelet Antigen Genotyping PLA 2 Polymorphism Detection) 500640 Potassium, Serum 500258 Pregnenolone 300121 Prekallikrein (Fletcher Factor) Assay 500925 Premature Adrenarche Profile I (Androstenedione, DHEA-S, 17-OH-Progesterone, Testosterone) 500930 Premature Adrenarche Profile II (Androstenedione, DHEA, 17-OH-Pregnenolone, 17-OH-Progesterone, Testosterone)   Progesterone, 17a-OH—see 500270 - Hydroxyprogesterone, 17a- 500266 Progesterone, Mass Spectrometry 500272 Proinsulin   Prolactin, Macro- see 500375 - Macroprolactin 500274 Prolactin, Serum (ICMA)   Prolonged Prothrombin Time or APTT - see 300908 - Abnormal APTT/Prothrombin Time Evaluation 300035 Protein C Activity (Chromogenic) 300149 Protein C Activity and Protein S Activity 300204 Protein C Activity and Protein S Activity, Protein C Antigen and Protein S Antigen, Total 300177 Protein C Activity and Protein S Antigen, Free 300036 Protein C Antigen 300142 Protein C Antigen and Protein S Antigen, Total 300032 Protein C Antigen, Protein S Antigen/ Factor VII Antigen Ratios *RUO* 300067 Protein C Antigen/Factor VII Antigen Ratio *RUO* 300088 Protein S Activity 300087 Protein S Antigen, Free 300038 Protein S Antigen, Total 300929 Protein S Antigen, Total and Free 300059 Protein S Antigen/Factor VII Antigen Ratio *RUO* 300928 Protein S Profile (Protein S Activity (clot), Protein S Antigen Free, Protein S Antigen Total) 300340 Protein Z Antigen *RUO* 300718 Prothrombin Fragment 1+ 2, monoclonal   Prothrombin Gene 20210A Mutation (Factor II Mutation) - see 120736 - Factor II Gene Mutation (Prothrombin G20210A)   Prothrombin Time Abnormal Evaluation- see 300908 - Abnormal APTT/Prothrombin Time Evaluation 300116 Prothrombin Time Mixing Studies: PT, PT 1:1 NP, PT 1:1 NP 60 min. incubation, PT 1:1 NP 60 min. incubation control 300080 Prothrombin Time/INR   PTH, Intact - see 500246 - Parathyroid Hormone, Intact (PTH)