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*Etiology: autoimmune. | *Etiology: autoimmune. | ||
Diagnosis based on serology for antibodies to:<ref name=pmid12643357>{{Cite journal | last1 = Oh | first1 = R. | last2 = Brown | first2 = DL. | title = Vitamin B12 deficiency. | journal = Am Fam Physician | volume = 67 | issue = 5 | pages = 979-86 | month = Mar | year = 2003 | doi = | PMID = 12643357 }}</ref> | Diagnosis based on serology for antibodies to:<ref name=pmid12643357>{{Cite journal | last1 = Oh | first1 = R. | last2 = Brown | first2 = DL. | title = Vitamin B12 deficiency. | journal = Am Fam Physician | volume = 67 | issue = 5 | pages = 979-86 | month = Mar | year = 2003 | doi = | PMID = 12643357 }}</ref><ref>{{cite journal |authors=Salinas M, Flores E, López-Garrigós M, Leiva-Salinas C |title=High frequency of anti-parietal cell antibody (APCA) and intrinsic factor blocking antibody (IFBA) in individuals with severe vitamin B12 deficiency - an observational study in primary care patients |journal=Clin Chem Lab Med |volume=58 |issue=3 |pages=424–429 |date=February 2020 |pmid=31714882 |doi=10.1515/cclm-2019-0749 |url=}}</ref> | ||
*Parietal cells. | *Parietal cells: anti-parietal cell antibody (APCA). | ||
*Intrinsic factor. | *Intrinsic factor: intrinsic factor blocking antibody (IFBA). | ||
Others: | Others: |
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