{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T12:43:48Z","timestamp":1756385028762,"version":"3.44.0"},"reference-count":15,"publisher":"BMJ","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Reports"],"accepted":{"date-parts":[[2014,2,3]]},"abstract":"<jats:p>We describe two patients, a father and a son, presenting with erythrocytosis. Evaluation showed no pulmonal or cardial disorders. Owing to an elevated erythropoietin level after phlebotomy, a physiological secondary polycythaemia was suspected. A haemoglobin electrophoresis showed that our patients have a haemoglobinopathy with high affinity for oxygen, called Hb-Malm\u00f6 (exon 3: c.294 C&gt;G p.His98Gln). Hb-Malm\u00f6 is a congenital disorder located on a gene at chromosome 11, in the B-chain on codon 97, decoding the \u03b1-subunit and \u03b2-subunit of the haemoglobin. Through a mutation (CAC\u2192CAG), histidine is replaced by glutamine. The mutation causes a disorder in the connection between the \u03b11-subunit and \u03b22-subunit of the haemoglobin structure. These connections are important sites for binding oxygen. Mutated haemoglobin has a preference for an oxygenated status, which implicates that there is an increased binding and decreased release of oxygen. To compensate, there will be an erythrocytosis to transport sufficient oxygen to the peripheral tissues.<\/jats:p>","DOI":"10.1136\/bcr-2014-203701","type":"journal-article","created":{"date-parts":[[2014,3,5]],"date-time":"2014-03-05T06:45:00Z","timestamp":1394001900000},"page":"bcr2014203701","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["At high altitude in the Netherlands: secondary erythrocytosis due to HB-Malm\u00f6"],"prefix":"10.1136","volume":"2014","author":[{"given":"Bart","family":"Santbergen","sequence":"first","affiliation":[{"name":"Department of Internal Medicine, St. Elisabeth Hospital, Tilburg, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cees","family":"van der Heul","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine, St. Elisabeth Hospital, Tilburg, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2014,3,5]]},"reference":[{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.1","first-page":"1770","article-title":"Systematic diagnosis of erythrocytosis","volume":"151","author":"de Heer","year":"2007","journal-title":"Ned Tijdschr Geneeskd"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.2","doi-asserted-by":"publisher","DOI":"10.1042\/bj1190068Pa"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.3","doi-asserted-by":"crossref","first-page":"355","DOI":"10.1111\/j.1600-0609.1972.tb00953.x","article-title":"Erythrocytosis associated with haemoglobin Malmo, accompanied by pulmonary changes, occurring in the same family","volume":"9","author":"Berglund","year":"1972","journal-title":"Scand J Haematol"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.4","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1096-8652(199601)51:1<32::AID-AJH6>3.0.CO;2-8"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.5","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2141.1976.tb00975.x"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.6","doi-asserted-by":"publisher","DOI":"10.1081\/HEM-200058571"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.7","doi-asserted-by":"publisher","DOI":"10.1007\/s00277-008-0581-x"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.8","first-page":"721","article-title":"Familial erythrocytosis due to electrophoretically undetectable hemoglobin with impaired oxygen dissociation (hemoglobin Malmo, alpha 2 beta 2 97 gln)","volume":"46","author":"Fairbanks","year":"1971","journal-title":"Mayo Clin Proc"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.9","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3476(76)81083-9"},{"key":"2025082805190728000_2014.mar05_1.bcr2014203701.10","first-page":"285","article-title":"Polycythemia resulting from abnormal hemoglobin with increased affinity for oxygen. 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