Fluorescence Polarization ImmunoassayFluorescence PolarizationHomocysteineVitamin B 12ImmunoassayFolic AcidHyperhomocysteinemiaEnzyme Multiplied Immunoassay TechniqueHomocystineBetaine-Homocysteine S-MethyltransferaseMethylenetetrahydrofolate Reductase (NADPH2)Lipotropic AgentsCystathionine beta-SynthaseDigoxinVitamin B 6Vitamin B ComplexSolanineMethionineChromatography, High Pressure LiquidBetaineOxidoreductases Acting on CH-NH Group DonorsAutoanalysisPhenytoinBlood StainsSubstance Abuse DetectionPyridoxine5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseRadioimmunoassayReagent Kits, DiagnosticGentamicinsFolic Acid DeficiencyS-AdenosylhomocysteineDietary SupplementsVancomycinVitamin B 6 DeficiencyQuality ControlCyclosporinsGas Chromatography-Mass SpectrometryXanthurenatesSpectrometry, FluorescenceTeicoplaninGlycine N-MethyltransferaseImmunoenzyme TechniquesDrug MonitoringS-AdenosylmethionineBiological AssayFluorescenceDiphenylhexatrieneCaseinsFalse Negative ReactionsCholine DeficiencyTheophyllineCross ReactionsCholineDietSensitivity and SpecificityCyclosporineGenotypeVitamin B 12 DeficiencyRisk FactorsReproducibility of ResultsFluorescent Antibody TechniqueFetal Organ MaturityBiological MarkersPolymorphism, GeneticFluorescent DyesDouble-Blind MethodMethylmalonic AcidMembrane FluidityHomocystinuriaAnti-Bacterial AgentsDose-Response Relationship, DrugCase-Control StudiesMicroscopy, FluorescenceLiverAnalysis of VarianceCysteineFluoresceinsCross-Over StudiesRegression Analysis5,10-Methylenetetrahydrofolate Reductase (FADH2)Microscopy, PolarizationFood, Fortified