{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T07:26:54Z","timestamp":1792049214174,"version":"4.4.0"},"reference-count":18,"publisher":"Walter de Gruyter GmbH","issue":"3","license":[{"start":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T00:00:00Z","timestamp":1780272000000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,6,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Testing for ABO incompatibility between a potential blood donor and recipient is the cornerstone of pretransfusion testing. Occasionally, weak agglutination reactions occur due to low expression of A and B antigens on the surface of red blood cells. This can lead to inconsistencies in blood group typing, as seen in a case where a patient\u2019s forward and reverse typing showed discrepancies. Following a comprehensive analytical assessment, the patient was identified as having a distinctive variant of blood group A, belonging to the less common subgroups\u2014A\n                    <jats:sub>3<\/jats:sub>\n                    , A\n                    <jats:sub>end<\/jats:sub>\n                    , A\n                    <jats:sub>x<\/jats:sub>\n                    , A\n                    <jats:sub>m<\/jats:sub>\n                    , A\n                    <jats:sub>y<\/jats:sub>\n                    , and A\n                    <jats:sub>el<\/jats:sub>\n                    . Herein, we present 3 case series of ABO subgroups identified through extended ABO blood grouping procedures.\n                  <\/jats:p>","DOI":"10.2478\/abm-2026-0023","type":"journal-article","created":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T20:59:15Z","timestamp":1785531555000},"page":"202-205","source":"Crossref","is-referenced-by-count":1,"title":["Rare subgroup of A phenotype\u2014a case series"],"prefix":"10.2478","volume":"20","author":[{"given":"Nur Ilyia Syazwani","family":"Saidin","sequence":"first","affiliation":[{"name":"Hematology Department, School of Medical Sciences, Health Campus , Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"},{"name":"Hospital Pakar Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nurul Anis Che","family":"Anuar","sequence":"additional","affiliation":[{"name":"Hematology Department, School of Medical Sciences, Health Campus , Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"},{"name":"Hospital Pakar Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohd Nazri","family":"Hassan","sequence":"additional","affiliation":[{"name":"Hematology Department, School of Medical Sciences, Health Campus , Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"},{"name":"Hospital Pakar Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noor Haslina Mohd","family":"Noor","sequence":"additional","affiliation":[{"name":"Hematology Department, School of Medical Sciences, Health Campus , Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"},{"name":"Hospital Pakar Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zefarina","family":"Zulkafli","sequence":"additional","affiliation":[{"name":"Hematology Department, School of Medical Sciences, Health Campus , Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"},{"name":"Hospital Pakar Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hisham Atan","family":"Edinur","sequence":"additional","affiliation":[{"name":"School of Health Sciences, Health Campus , Universiti Sains Malaysia , Kubang Kerian , Kelantan , Malaysia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"374","published-online":{"date-parts":[[2026,6,30]]},"reference":[{"key":"2026080416002152655_j_abm-2026-0023_ref_001","unstructured":"Green REB, DAK. The ABO blood group system. 7th ed. Philadelphia: FA Davis Company; 2019."},{"key":"2026080416002152655_j_abm-2026-0023_ref_002","doi-asserted-by":"crossref","unstructured":"Desai P, Navkudkar A, Rajadhyaksha S. ABO blood group discrepancies in blood donor and patient samples at a tertiary care oncology centre: analysis and serological resolution. Hematol Transfus Cell Ther. 2023; 46:402\u20137.","DOI":"10.1016\/j.htct.2023.07.011"},{"key":"2026080416002152655_j_abm-2026-0023_ref_003","doi-asserted-by":"crossref","unstructured":"Arumugam P, Hamsavardhini S, Ravishankar J, Bharath RR. Resolving ABO discrepancies by serological workup\u2014an analysis of few cases. Int J Res Med Sci. 2017; 5:1011\u20134.","DOI":"10.18203\/2320-6012.ijrms20170632"},{"key":"2026080416002152655_j_abm-2026-0023_ref_004","doi-asserted-by":"crossref","unstructured":"Daniels G. Human blood groups. 3rd ed. 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Absence of 1061C deletion in A2 blood subgroup validated through gene sequencing in the Malaysian population. Life Sci Med Biomed. 2019; 3:1\u20136.","DOI":"10.28916\/lsmb.3.5.2019.27"},{"key":"2026080416002152655_j_abm-2026-0023_ref_009","unstructured":"Landsteiner K. The ABO blood group. In: Blood groups and red cell antigens. Bethesda: National Center for Biotechnology Information (US); 2005."},{"key":"2026080416002152655_j_abm-2026-0023_ref_010","doi-asserted-by":"crossref","unstructured":"Wang Z, Jin S, Zheng J, Qian C, Cai X, Xiang D. Prevalence and distribution of serological characteristics of weak ABO subgroups in the Chinese population. Hematol Transfus Cell Ther. 2024; 46(Suppl 5):S115\u201321.","DOI":"10.1016\/j.htct.2024.04.127"},{"key":"2026080416002152655_j_abm-2026-0023_ref_011","doi-asserted-by":"crossref","unstructured":"Che Ghazali NH, Zulkafli Z, Md. Riffin NS, Tuan Mohammad TH, Hassan MN, Poonachi P, et al. Extended blood group profiles for Malays, Chinese, and Indians in Peninsular Malaysia. Egypt J Med Hum Genet. 2020; 21:51. doi: 10.1186\/s43042-020-00096-y","DOI":"10.1186\/s43042-020-00096-y"},{"key":"2026080416002152655_j_abm-2026-0023_ref_012","doi-asserted-by":"crossref","unstructured":"Giriyan SS, Agrawal A, Bajpai R, Nirala NK. A1 and A2 subtypes of blood group A: a reflection of their prevalence in North Karnataka region. J Clin Diagn Res. 2017; 11:EC40\u20132.","DOI":"10.7860\/JCDR\/2017\/26772.9893"},{"key":"2026080416002152655_j_abm-2026-0023_ref_013","doi-asserted-by":"crossref","unstructured":"Huang Y, Lin J, Zhu S. Genetic sequencing analysis of the A307 subgroup of ABO blood group. Int J Clin Exp Med. 2015; 8:9585\u20139.","DOI":"10.12659\/MSM.894021"},{"key":"2026080416002152655_j_abm-2026-0023_ref_014","doi-asserted-by":"crossref","unstructured":"Suzuki K. ABO blood group alleles and genetic recombination. Leg Med (Tokyo). 2005; 7:205\u201312.","DOI":"10.1016\/j.legalmed.2005.02.004"},{"key":"2026080416002152655_j_abm-2026-0023_ref_015","doi-asserted-by":"crossref","unstructured":"Nair R, Gogri H, Kulkarni S, Gupta D. Detection of a rare subgroup of A phenotype while resolving ABO discrepancy. Asian J Transfus Sci. 2019; 13:129\u201331.","DOI":"10.4103\/ajts.AJTS_118_17"},{"key":"2026080416002152655_j_abm-2026-0023_ref_016","doi-asserted-by":"crossref","unstructured":"Olsson ML, Chester MA. Polymorphism and recombination events at the ABO locus: a major challenge for genomic ABO blood grouping strategies. Transfus Med. 2001; 11:295\u2013313.","DOI":"10.1046\/j.1365-3148.2001.00320.x"},{"key":"2026080416002152655_j_abm-2026-0023_ref_017","doi-asserted-by":"crossref","unstructured":"Hosseini-Maaf B, Chester MA, Olsson ML. An extensive polymerase chain reaction\u2013allele-specific polymorphism strategy for clinical ABO blood group genotyping that avoids potential errors caused by null, subgroup, and hybrid alleles. Transfusion. 2007; 47:2110\u201325.","DOI":"10.1111\/j.1537-2995.2007.01436.x"},{"key":"2026080416002152655_j_abm-2026-0023_ref_018","unstructured":"Fathima S, Killeen RB. ABO typing discrepancies. In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2026 Jan\u2013. PMID: 36251843."}],"container-title":["Asian Biomedicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/reference-global.com\/pdf\/10.2478\/abm-2026-0023","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T16:00:31Z","timestamp":1785859231000},"score":1,"resource":{"primary":{"URL":"https:\/\/reference-global.com\/article\/10.2478\/abm-2026-0023"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,6,1]]},"references-count":18,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2026,6,30]]},"published-print":{"date-parts":[[2026,6,1]]}},"alternative-id":["10.2478\/abm-2026-0023"],"URL":"https:\/\/doi.org\/10.2478\/abm-2026-0023","relation":{},"ISSN":["1875-855X"],"issn-type":[{"value":"1875-855X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,6,1]]}}}