CTRP Terminology CTRP Biomarker Terminology SPL UCUM Terminology PQ/CMC Units of Measure Terminology CDISC DDF Terminology CDISC SDTM Tobacco Product Testing Test Code Terminology CDISC SDTM Tobacco Product Testing Test Name Terminology CDISC DDF Administrable Product Property Type Value Set Terminology HL7 FHIR v5.0.0 R5 Unit of Measure Terminology pH CDISC pH The negative logarithm (base 10) of the concentration of hydronium ions, which is used as a measure of the acidity or alkalinity of a fluid. C45997 HL7 pH Quantitative Concept pH [pH] UCUM CTRP Quantity of dimension one used to express on a scale from 0 to 14 the amount-of-substance concentration of hydrogen ion of dilute aqueous solution, calculated as the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter. C4048290 pH PH potential of Hydrogen FDA Ionic Strength FDA Structured Product Labeling Terminology Clinical Data Interchange Standards Consortium Terminology CDISC SDTM Laboratory Test Code Terminology CDISC SDTM Terminology CDISC SDTM Laboratory Test Name Terminology UCUM Terminology HL7 Unit of Measure Terminology CDISC SEND Terminology CDISC ADaM Terminology