Reference StandardsQuality ControlCalibrationAccreditationLaboratoriesChemistry, ClinicalReproducibility of ResultsFreeze DryingSensitivity and SpecificityReference ValuesSpectrophotometry, AtomicInternational CooperationClinical Laboratory TechniquesChromatography, High Pressure LiquidClinical Chemistry TestsTerminology as TopicNitric AcidImmunoassayUnited StatesPhosphorous AcidsTrace ElementsGas Chromatography-Mass SpectrometryChemistry Techniques, AnalyticalMicrowavesMass SpectrometryNephelometry and TurbidimetryPathology, MolecularObserver VariationIndicators and ReagentsRadioisotope Dilution TechniqueIndicator Dilution TechniquesBlood Specimen CollectionChromatography, LiquidDiagnostic Techniques and ProceduresPredictive Value of TestsIsotopesLeadTomography, X-Ray ComputedTime FactorsApolipoprotein A-IApolipoproteins BMetals, HeavyDiagnostic Tests, RoutineROC Curvegamma-GlutamyltransferaseSerumAlgorithmsDrug StabilityWorld Health OrganizationLaboratories, HospitalMaterials TestingProspective StudiesEnvironmental MonitoringFood AnalysisReagent Kits, DiagnosticMercuryGenetic TestingLimit of DetectionEnvironmental PollutantsAnimals, LaboratoryContrast MediaMagnetic Resonance ImagingCadmiumPolymerase Chain ReactionRadiographic Image Interpretation, Computer-AssistedImaging, Three-DimensionalRetrospective StudiesRegression AnalysisWaterImage Processing, Computer-AssistedWater Pollutants, ChemicalImage Interpretation, Computer-AssistedRadiographic Image EnhancementSeawaterAngiography, Digital SubtractionRadiologySpectrophotometryEvaluation Studies as TopicMedical Laboratory PersonnelBignoniaceaeImage EnhancementDiagnostic ErrorsMicroscopyReagent StripsHydrogen-Ion ConcentrationMagnetic Resonance AngiographyPoint-of-Care SystemsAutomationTandem Mass SpectrometryNatural Language ProcessingClinical CodingTemperatureCineradiographyFalse Positive ReactionsDatabases, FactualPhotographyTreatment OutcomeInfant, NewbornSoftwarePhysical Examination