Anemia, MegaloblasticAnemia, MacrocyticMegaloblastsAnemiaVitamin B 12 DeficiencyAnemia, PerniciousFolic Acid DeficiencyVitamin B 12FIGLU TestThiamineHydroxocobalaminIntrinsic FactorAnemia, HypochromicFolic AcidDeoxyuridineAnemia, AplasticPregnancy Complications, HematologicBone Marrow ExaminationAnemia, HemolyticHomocystinuriaErythrocytes, AbnormalNeurologic Manifestations5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseFanconi AnemiaMalabsorption SyndromesVitamin B ComplexPancytopeniaSchilling TestDiphyllobothriasisErythropoiesisAnemia, Hemolytic, AutoimmuneEuglenaTranscobalaminsBone MarrowErythrocyte CountClinical Enzyme TestsAnemia, Sickle CellHearing Loss, SensorineuralMethylmalonic AcidBlood Group AntigensAnemia, SideroblasticErythrocytesErythroblastsInfectious Anemia Virus, EquineConsanguinityThymine NucleotidesHemoglobinsXyloseAnemia, RefractoryFolate Receptors, GPI-AnchoredHomocysteine