Bobée Victor, Feugray Guillaume, Brunel Valéry, Joly Philippe, Lahary Agnès
a Service d'Hématologie Biologique, Centre Hospitalier Universitaire de Rouen , Rouen , France.
b Service de Biochimie Médicale, Centre Hospitalier Universitaire de Rouen, Rouen, France.
Hemoglobin. 2019 Jan;43(1):50-51. doi: 10.1080/03630269.2019.1567529. Epub 2019 Jan 30.
We report two members of a French family who are carriers of a rare hemoglobin (Hb) variant leading to erythrocytosis: Hb Saint Nazaire [β103(G5)Phe→Ile; : c.310T>A]. The proband is a 38-year-old woman referred to our institution for a moderate but persistent polycythemia without any clinical consequence. As her mother had a similar blood count, a diagnosis of a Hb variant with high oxygen affinity was proposed. The variant was difficult to detect by capillary electrophoresis (CE) and not distinguishable by high performance liquid chromatography (HPLC) and isoelectric focusing. Finally, a heterozygous mutation on the gene corresponding to Hb Saint Nazaire was identified. This case report illustrates that this rare cause of erythrocytosis can be easily under or misdiagnosed unless several Hb separation techniques are used.
