| Chemical | Method No. | Method Name | 
| PAC | 5800 | POLY AROMATIC COMPOUNDS, TOTAL (PACs) | 
| Palladium | 7303 | ELEMENTS by ICP (hot block/HCI/HNO3 digestion) | 
| Paraquat | 5003 | PARAQUAT | 
| Parathion | 5600 | ORGANOPHOSPHORUS PESTICIDES | 
| Particulates N.O.R. | 0500 | PARTICULATES N.O.R., TOTAL PARTICULATES N.O.R., TOTAL | 
| Particulates N.O.R. | 0501 | PARTICULATES N.O.R., TOTAL PARTICULATES N.O.R., TOTAL Now available in NMAM 5th edition | 
| Particulates N.O.R. | 0600 | PARTICULATES, N.O.R, RESPIRABLE | 
| Pentachlorobenzene | 5517 | POLYCHLOROBENZENES | 
| Pentachloroethane | 2517 | PENTACHLOROETHANE | 
| Pentachlorophenol | 5512 | PENTACHLOROPHENOL | 
| Pentachlorophenol | 8001 | PENTACHLOROPHENOL in blood | 
| Pentachlorophenol | 8303 | PENTACHLOROPHENOL in urine | 
| Pentamidine | 5032 | PENTAMIDINE ISETHIONATE | 
| nPentane | 2549 | VOLATILE ORGANIC CPDS (Screening) | 
| nPentane | 1500 | HYDROCARBONS, BP 36° - 126°C | 
| 2-Pentanone | 1300 | KETONES I | 
| 2-Pentanone | 2555 | KETONES I | 
| Perchloroethylene | 3704 | PERCHLOROETHYLENE (port GC) in exhaled breath and air | 
| Perchloroethylene | 2549 | VOLATILE ORGANIC CPDS (Screening) | 
| Pesticides | 5600 | ORGANOPHOSPHORUS PESTICIDES | 
| Pesticides | 5601 | ORGANONITROGEN PESTICIDES | 
| Petroleum ether/naphtha | 1550 | NAPHTHAS | 
| Phenanthrene | 5506 | POLYNUCLEAR AROMATIC HYDROCARBONS by HPLC | 
| Phenanthrene | 5515 | POLYNUCLEAR AROMATIC HYDROCARBONS | 
| Phencyclidine | 9106 | METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Liquid-Liquid Extraction Now available in NMAM 5th edition | 
| Phencyclidine | 9109 | METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Solid Phase Extraction Now available in NMAM 5th edition | 
| Phenol | 2549 | VOLATILE ORGANIC CPDS (Screening) | 
| Phenol | 2546 | CRESOLS and PHENOL | 
| Phenol | 8305 | PHENOL and p-CRESOL in urine | 
| Phentermine | 9106 | METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Liquid-Liquid Extraction Now available in NMAM 5th edition | 
| Phentermine | 9109 | METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Solid Phase Extraction Now available in NMAM 5th edition | 
| Phenyl ether | 1617 | PHENYL ETHER | 
| Phenyl etherdiphenyl mixture | 2013 | PHENYL ETHERDIPHENYL MIXTURE | 
| Phenyl glycidyl ether | 1619 | PHENYL GLYCIDYL ETHER | 
| Phenylhydrazine | 3518 | PHENYLHYDRAZINE | 
| S-phenylmercapturic acid | 8326 | S-BENZYLMERCAPTURIC ACID and S-PHENYLMERCAPTURIC ACID in urine Now available in NMAM 5th edition | 
| Phenylpropanolamine | 9106 | METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Liquid-Liquid Extraction Now available in NMAM 5th edition | 
| Phenylpropanolamine | 9109 | METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Solid Phase Extraction Now available in NMAM 5th edition | 
| Phorate | 5600 | ORGANOPHOSPHORUS PESTICIDES | 
| Phosdrin (mevinphos) | 5600 | ORGANOPHOSPHORUS PESTICIDES | 
| Phosphine | 6002 | PHOSPHINE | 
| Phosphoric acid | 7903 | ACIDS, INORGANIC | 
| Phosphoric Acid | 7908 | NON-VOLATILE ACIDS (Sulfuric Acid and Phosphoric Acid) Now available in NMAM 5th edition | 
| Phosphorus | 7300 | ELEMENTS by ICP | 
| Phosphorus | 7301 | ELEMENTS by ICP (aqua regia ashing) | 
| Phosphorus | 7303 | ELEMENTS by ICP (hot block/HCI/HNO3 digestion) | 
| Phosphorus (P) | 7302 | ELEMENTS by ICP (Microwave Digestion) Now available in NMAM 5th edition | 
| Phosphorus (P) | 7304 | ELEMENTS by ICP (Microwave Digestion) Now available in NMAM 5th edition | 
| Phosphorus (P) | 7306 | ELEMENTS by Cellulosic Internal Capsule Sampler Now available in NMAM 5th edition | 
| Phosphorus | 9102 | ELEMENTS ON WIPES | 
| Phosphorus | 7905 | PHOSPHORUS | 
| Phosphorus trichloride | 6402 | PHOSPHORUS TRICHLORIDE | 
| Pinene | 1552 | TERPENES | 
| Pinene | 2549 | VOLATILE ORGANIC CPDS (Screening) | 
| Platinum | 7300 | ELEMENTS by ICP | 
| Platinum | 7303 | ELEMENTS by ICP (hot block/HCI/HNO3 digestion) | 
| Platinum (Pt) | 7302 | ELEMENTS by ICP (Microwave Digestion) Now available in NMAM 5th edition | 
| Platinum (Pt) | 7304 | ELEMENTS by ICP (Microwave Digestion) Now available in NMAM 5th edition | 
| PAH | 5506 | POLYNUCLEAR AROMATIC HYDROCARBONS | 
| Polyacrylate | 5035 | SUPER ABSORBENT POLYMER | 
| PACs | 5800 | POLYCYCLIC AROMATIC COMPOUNDS, TOTAL | 
| Polychlorobiphenyl (42% & 54% Cl) | 5503 | POLYCHLOROBIPHENYLS | 
| Potassium | 7300 | ELEMENTS by ICP (nitric/perchloric acid ashing) | 
| Potassium | 7301 | ELEMENTS by ICP (aqua regia ashing) | 
| Potassium | 7303 | ELEMENTS by ICP (hot block/HCI/HNO3 digestion) | 
| Potassium (K) | 7302 | ELEMENTS by ICP (Microwave Digestion) Now available in NMAM 5th edition | 
| Potassium (K) | 7304 | ELEMENTS by ICP (Microwave Digestion) Now available in NMAM 5th edition | 
| Potassium (K) | 7306 | ELEMENTS by Cellulosic Internal Capsule Sampler Now available in NMAM 5th edition | 
| Potassium hydroxide | 7401 | ALKALINE DUSTS | 
| Progesterone | 5044 | ESTROGENIC COMPOUNDS | 
| Propazine | 8315 | TRIAZINE HERBICIDES and their metabolites, in urine | 
| Propham | 5601 | ORGANONITROGEN PESTICIDES | 
| Propionaldehyde | 2018 | ALIPHATIC ALDEHYDES | 
| Propionaldehyde | 2539 | ALDEHYDES, SCREENING | 
| Propoxur | 5601 | ORGANONITROGEN PESTICIDES | 
| n-Propyl acetate | 1450 | ESTERS I | 
| n-Propyl alcohol | 1405 | ALCOHOLS COMBINED | 
| n-Propyl alcohol | 1401 | ALCOHOLS II | 
| Propylene dichloride | 1013 | PROPYLENE DICHLORIDE | 
| Propylene glycol | 5523 | GLYCOLS | 
| Propylene glycol monomethyl ether | 2554 | GLYCOL ETHERS | 
| Propylene glycol monomethyl ether acetate | 2554 | GLYCOL ETHERS | 
| Propylene oxide | 1612 | PROPYLENE OXIDE | 
| Pseudoephedrine | 9106 | METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Liquid-Liquid Extraction Now available in NMAM 5th edition | 
| Pseudoephedrine | 9109 | METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Solid Phase Extraction Now available in NMAM 5th edition | 
| Pyrene | 5506 | POLYNUCLEAR AROMATIC HYDROCARBONS by HPLC | 
| Pyrene | 5515 | POLYNUCLEAR AROMATIC HYDROCARBONS | 
| Pyrethrum | 5008 | PYRETHUM | 
| Pyridine | 1613 | PYRIDINE |