| P | Proportioning Control |
| P | Pharmacy only medicine (UK) |
| P/S | Price/Sales |
| P | Proline (amino acid) |
| P/CF | Price/cash flow |
| P/E | Price/earnings ratio |
| P&L | Profit and loss |
| PA | Polyacrylate |
| PA | Polyamide |
| PAABA | 4-Acetamidobenzoic acid |
| PABA | Para-AminoBenzoic Acid |
| PABX | Private automatic branch exchange |
| PAC | Political action committee |
| PAC | Post-approval change |
| PAC-ATLS | PAC for alternate testing laboratory services |
| PAC-SAS | PAC for sterile aqueous solutions |
| PAC-TDS | PAC for transdermal systems |
| PAG | Photo-acid generator |
| PAGB | Proprietary Association of Great Britain |
| PAGE | Polyacrylamide Gel Electrophoresis |
| PAH | Polycyclic Aromatic Hydrocarbon |
| PAI | Polyamide-imide |
| PAI | Pre-approval inspection (US FDA) |
| PALS | Phase analysis light scattering |
| PAM | Pyridine Aldoxime Methiodide |
| PAN | Polyacrylonitrile |
| PAP | Prostatic Acid Phosphatase |
| PAP | Papanicolaou (test) |
| PAR | Poly(arylimide) |
| PAR | 4-(2-pyridylazo)resorcinol |
| PAS | Photoacoustic Spectroscopy |
| PAS | Polyarylsulfone |
| PASA | Para-AminoSalicylic Acid |
| PASC | Pacific Asia Standards Conference |
| PAT | Profit after tax |
| PB | Phosphate buffer |
| PBB | 4-phenyl-2-benzylbutyl |
| PBBO | 2-(4-biphenylyl)-6-phenylbenzoxazole |
| PBD | 2-(4-biphenylyl)-5-phenyl-1,3,4-oxadiazole |
| PBD | Polybutadiene |
| PBG | Photonic band gap |
| PBI | Protein-bound iodine |
| PBIT | Profit before interest payable and tax |
| PBM | Performance-Based (analytical) Methods |
| PBMS | Performance based measurement system (US EPA) |
| PBN | N-tert.-butyl-FONT FACE="Symbol">a-phenylnitrone |
| PBPs | Penicillin-binding proteins |
| PBS | Phosphate-buffered saline |
| PBSF | Perfluorobutane sulfonyl fluoride |
| PBT | Poly(butylene terephthalate) |
| PBT | Profit before tax |
| PBX | Private Branch Exchange (telephone exchange on customer premises) |
| PC | Personal Computer(often implies IBM-compatible0 |
| PC | Politically Correct |
| PC | Polycarbonate |
| PC | Polycarbonate |
| PCA | Principal Component Analysis (of spectra) |
| PCAST | President's Committee of Advisers on Science and Technology |
| PCB | Printed Circuit Board |
| PCB | PolyChlorinated Biphenyl(s) |
| PCBA | para-Chlorobenzoic acid |
| PCBC | para-Chlorobenzoyl chloride |
| PCBN | para-Chlorobenzonitrile |
| PCBTF | para-Chlorobenzotrifluoride |
| PCC | Primary cell culture(culture de cellules primaires) |
| PCCPCC | Pyridinium chlorochromate |
| PCPP | Bis(p-carboxyphenoxy)propane |
| PCE | Perchloroethylene (= tetrachloroethylene) |
| PCI | Precast/Prestressed Concrete Institute |
| PCM | Phase Contrast Microscopy |
| PCM | Pulse code modulation |
| PCMB | para-Chloromercuribenzoic acid |
| PCMP | Post-CMP |
| PCMX | para-Chloro-m-xylene(4-chloro-3,5-dimethylphenol) |
| PCNB | Pentachloronitrobenzene |
| PCONA | 4-chloro-2-nitroaniline(para-chloro-o-nitroaniline) |
| PCP | Pentachlorophenol |
| PCP | Phencyclidine(phenyl cyclohexyl piperidine) |
| PCP | Pneumocystis carinii pneumonia |
| PCPA | para-Chlorophenylacetic acid |
| PCR | Polymerase Chain Reaction |
| PCT | Poly(cyanoterephthalylidene) |
| PCT | Patent Cooperation Treaty |
| PCT | para-Chlorotoluene |
| PCTA | Precision Case Telescoped Ammunition |
| PCTC | 4-Chlorobenzotrichloride |
| PCV | Packed Cell Volume |
| PD | Proportioning plus Derivative (Rate) control |
| PD50 | Protective dose 50% |
| PDC | Pyridinium dichromate |
| PDEA | N-phenyldiethanolamine |
| PDECD | Pulsed Discharge Electron Capture Detector (Gas chromatography) |
| PDF | Portable Document Format |
| PDG | Pharmacopeial Discussion Group (US, Japan, European Pharmacopeias) |
| PDH | Plesiosynchronous Digital Hierarchy |
| PDHID | Pulsed Discharge Helium Ionization Detector (Gas chromatography) |
| PDI | Polydispersity index(Mw/Mn) |
| PDMS | Polydimethylsiloxane |
| PDO | Italian WWI term: 91% phosgene, carbon disulfide, chloromethanes |
| PDPID | Pulsed Discharge Photoionization Detector (Gas chromatography) |
| PDQ | Pretty Damned Quick |
| PDT | 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine |
| PDUFA | Prescription Drug User Fee Act (fee paid by pharmaceutical mfrs.) |
| PDUFA | Prescription Drug User Fee Act (US) |
| PE | Pharmacopée Européene(= EP) |
| PE | Professional Engineer(US State-registered) |
| PE | Price/Earnings ratio |
| PE | Polyethylene |
| PEA | 2-anilinoethanol (N-phenylethanolamine) |
| PEBBLE | Probe encapsulated by biologically localized embedding |
| PEEK | Poly(ether-ether ketone) |
| PEEK | Poly(oxy-1m4-phenyleneoxy-1,4-phenylene-carbonyl-1,4-phenylene) |
| PEEP | Positive expiratory end pressure (artificial breathing) |
| PEF | Pulsed electrical field (food pasteurization process) |
| PEG | PolyEthylene Glycol |
| PEG | PneumoEncephaloGraphy |
| PEI | Poly(ethyleneimine) |
| PEK | Polyetherketone |
| PEL | Permissible Exposure Limit (US OSHA) |
| PEMA | 2-ethyl-2-phenylmalonamide |
| PEN | Pharmacy Equivalent Name |
| PEN | Polyethylene naphthalate (= naphthalene 2,6-dicarboxylate) |
| PEP | Phosphoenolpyruvic acid |
| PEP | Peak envelope power |
| PER | Product Evaluation Report (UK, pharmaceuticals) |
| PER | Protein Efficiency Ratio (nutrient value compared to casein) |
| PERT | Program Evaluation (and) Review Technique |
| PES | Polyether-sulfone |
| PES | Polyethersulfone |
| PET | Positron Emission Tomography |
| PET | Poly(ethylene terephthalate) |
| PETA | People for the Ethical Treatment of Animals |
| PETG | Poly(ethylene terephthalate), glycol-modified |
| PETN | Pentaerythritol Tetranitrate (explosive) |
| PF | Pharmacopeial Forum (a journal on development of procedures, etc.) |
| PFA | Paraformaldehyde |
| PFC | Perfluorocarbon |
| PFIB | Perfluoro-iso-butylene |
| PFPD | Pulsed Flame Photometric Detector (Gas chromatography) |
| PFU | Plaque-Forming Units (virology) |
| PGA | Poly-glycolic acid |
| PGM | Precision Guided Munition |
| PHA | Phytohemagglutinin |
| Phe | Phenylalanine |
| PHLS | Public Health Laboratory Service (British) |
| PHS | Polydroxystyrene |
| PHS | Public Health Service(US) |
| PI | Polyimide |
| PI | Polyisoprene |
| PI | Polyimide |
| PI | Polizeiinspektion |
| pI | Isoelectric point(a pH) |
| PIA | Plastics Industry Association [Australia] |
| PIC | Product(s) of Incomplete Combusion |
| PIC | Pharmaceutical Inspection Convention (UK . .) |
| PIC | Paured-ion chromatography |
| PID | Pelvic inflammatory disease |
| PID | Proportioning Control with Integral and Derivative action |
| PID | Photoionization detector (Gas chromatography) |
| PIF | Program Information File (Microsoft Windows) |
| PIL | Product Information Leaflet (UK, pharmaceuticals) |
| PIN | Positive-Intrinsic-Negative(photodiodes) |
| PIN | Personal Identification Number |
| PING | Packet Internet Groper |
| PINZ | Plastics Institute of New Zealand |
| PIONA | Paraffins, Iso-paraffins, Olefins, Naphthenes, Aromatics |
| PIPES | Piperazine-N,N'-bis[2-ethanesulfonic acid](buffer) |
| PITTCON | Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy |
| PIXE | Photon-Induced X-ray Emission |
| PK | Polyketone |
| PKU | PhenylKetonUria |
| PL | Product License (UK, pharmaceuticals) |
| PL(PI) | Product License (Parallel Import)(UK, pharmaceuticals) |
| PLA | Poly-lactic acid |
| PLL | Phase locked loop |
| PLM | Polarized Light Microscopy |
| PLOT | Porous Layer Open Tubular (Gas chromatograph columns) |
| PLR | Product License of Right (UK, pharmaceuticals) |
| PLS | Partial Lease Squares |
| PM | Preventive maintenance |
| PM | Power management |
| PM | Polizeimeister |
| PM | Polarizing Microscope |
| PM | Post-Mortem |
| PM | PolyMyositis |
| PMA | Pharmaceutical Manufacturers Association(US) |
| PMA | Phenylmercuric acetate |
| PMCC | Pensky-Martens Closed Cup (flash point) |
| PMDA | 1,2,4,5-Benzenetetracarboxylic acid anhydride |
| PMDI | Pressurized metered-dose inhaler |
| PMH | Phenylmercuric hydroxide |
| PMHS | Polymethylhydrosiloxane |
| PMMA | Poly(methy methacrylate) |
| PMMA | Poly(methyl methacrylate) |
| PMN | Polymorphonuclear leukocyte(s) |
| PMO | Paramethadione |
| PMP | Polymethylpentene |
| PMPA | (R)-9-(2-phosphonylmethoxypropyl)-adenine(anti-HIV drug) |
| PMS | Post-Marketing Surveillance (US FDA) |
| PMS | Premenstrual Syndrome |
| PMS | Pantone Matching System(for color matching) |
| PMS | Phenazine methosulfate |
| PMSF | FONT FACE="Symbol">a-toluenesulfonyl fluoride(= phenylmethylsulfonyl fluoride) |
| PMT | Photomultiplier Tube |
| PNA | Paraffins, Naphthenes and Aromatics |
| PND | Paroxysmal nocturnal dyspnea |
| PNK | Phosphonucleotide kinase |
| PNPP | para-Nitrophenyl phosphate |
| p.o. | Oral |
| PO | Palite Opacite: chloromethyl chloroformate and tin tetrachloride |
| POA | Phenoxyacetyl |
| POHC | Principal Organic Hazardous Constituent(s) |
| POM | Prescription Only Medicine (UK) |
| POM | Polyoxymethylene (acetal) |
| POM | Poly(oxymethylene) |
| POM | Polizeiobermeister |
| POM | Chloromethyl pivalate |
| PONA | Paraffins, Olefins, Naphthenes, and Aromatics |
| POP | Post Office Protocol(Internet) |
| POPOP | 1,4-bis(5-phenyloxazol-2-yl)benzene |
| POPSO | Piperazine-N,N'-bis[2-hydroxypropanesulfonic acid] (buffer) |
| POST | Power On Self Test |
| POTS | Publicly owned treatment system (sewage treatment plant) |
| PP | Polypropylene |
| PPA | Polyphthalamide |
| PPBS | PostPrandial Blood Sugar |
| PPC | Practical Pistol Course (pistol firing match) |
| PPC | Peste porcine classique (= CSF) |
| PPD | Purified Protein Derivative |
| PPE | Poly(phenylene ether) |
| PPE | Polyphenylene ether |
| PPE | Personal Protective Equipment |
| PPG | PostPrandial Glucose test |
| PPG | Pittsburgh Plate Glass |
| PPGS | Partially pregelatinized starch |
| PPI | Plastics Pipe Institute |
| PPO | Poly(phenylene oxide) |
| PPO | 2,5-Diphenyloxazole |
| PPP | Point to Point Protocol (Internet) |
| PPS | Polyphenylene sulfide |
| PPS | Poly(p-phenylene sulfide) |
| PPTP | Point to Point Tunneling Protocol (Internet) |
| PPV | Poly(p-phenylenevinylene) |
| PQ | Parliamentary Question (UK) |
| PQL | Practical Quantitation Limit |
| PQRI | Product Quality Research Institute |
| PR | Public Relations |
| PRA | Progestin Receptor Assay |
| PRK | Photoreactive keratotomy |
| PRL | PRoLactin |
| PRN | Practitioners Reporting Network |
| Pro | Proline |
| PRP | Potentially Responsible Parties(under CERCLA) |
| PRV | Pseudorabies virus |
| PS | Polystyrene |
| PS | Chlorpicrin (English WWI designation for chemical agent) |
| PSAB | Public and Scientific Affairs Board |
| PSB | Phosphate-Buffered Saline |
| PSB | Productivity and Standards Board (Singapore) |
| PSE | Pressurized solvent extraction |
| PSGE | Pulsed-gradient spin-echo(NMR) |
| PSO | Polysulfone |
| PSP | Pointed soft point (bullet) |
| PSPBT | Pointed Soft-Point Boat-Tail (bullet) |
| PST | Poly(styrene terephthalate) |
| PSTN | Public Switched Telephone Network(the usual phone system) |
| PSU | Polysulfone |
| PSU | Polyphenylene sulfone |
| PT | Prothrombin Time |
| PTA | Purified terephthalic acid |
| PTC | Percutaneous transhepatic cholangiography |
| PTCA | Percutaneous transluminal cardiac angioplasty |
| PTFE | Poly(tetrafluoroethylene) |
| PTGC | Programmed-Temperature Gas Chromatography |
| PTH | ParaThyroid Hormone (also Parathormone) |
| PTHC | Percutaneous Transhepatic Cholangiography |
| PTO | (U. S.) Patent and Trademark Office |
| PTO | Power Takeoff (shaft drive from a farm tractor) |
| PTT | Polytrimethylene terephthalate |
| PTT | Partial Thromboplastin Time |
| PTV | Programmed-Temperature Vaporization |
| PU | Polyurethane |
| PUC | Public Utilities Commission |
| PUR | Polyurethane |
| PVA | Poly(Vinyl Alcohol) |
| PVA | Poly(vinyl alcohol) |
| PVAc | Poly(vinyl acetate) |
| PVC | Poly(vinyl chloride) |
| PVC | Pigment volume concentration |
| PVDF | Poly(vinylidene difluoride) |
| PVP | Poly(vinylpyrollidinone) |
| PVÜ | Pariser Verbandsubereinkunft zum Schutz des Gewerb |
| Pyr | Pyridylalanine |
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