SNOMED CT, US Edition

Last uploaded: March 22, 2026
Id http://purl.bioontology.org/ontology/SNOMEDCT/5300004
http://purl.bioontology.org/ontology/SNOMEDCT/5300004
Preferred Name

Hemoglobin Bart's hydrops syndrome

Definitions
A severe form of alpha-thalassaemia that is mostly lethal and associated with severe long-term outcome and lifelong transfusions in survivors. It is characterised by fetal onset of generalised oedema, pleural and pericardial effusions, and severe hypochromic anaemia. A severe form of alpha-thalassemia that is mostly lethal and associated with severe long-term outcome and lifelong transfusions in survivors. It is characterized by fetal onset of generalized edema, pleural and pericardial effusions, and severe hypochromic anemia. A severe form of alpha-thalassemia that is mostly lethal, and associated with severe long-term outcome and lifelong transfusions in survivors. It is characterized by fetal onset of generalized edema, pleural and pericardial effusions, and severe hypochromic anemia. Caused by deletion or inactivation of all four alpha-globin alleles leading to a severe deficiency in alpha-globin chains of Hb, and to the production of gamma-4 tetramers (Hb Bart's) during fetal life, and beta-4 tetramers (HbH) postnatally. Hb Bart's and HbH have increased oxygen affinity resulting in ineffective tissue oxygen delivery. The disease is mostly the result of combined, biallelic deletions in the HBA1 and HBA2 genes (16p13.3). The pattern of inheritance is autosomal recessive. A severe form of alpha-thalassaemia that is mostly lethal, and associated with severe long-term outcome and lifelong transfusions in survivors. It is characterized by fetal onset of generalised oedema, pleural and pericardial effusions, and severe hypochromic anaemia. Caused by deletion or inactivation of all four alpha-globin alleles leading to a severe deficiency in alpha-globin chains of Hb, and to the production of gamma-4 tetramers (Hb Bart's) during fetal life, and beta-4 tetramers (HbH) postnatally. Hb Bart's and HbH have increased oxygen affinity resulting in ineffective tissue oxygen delivery. The disease is mostly the result of combined, biallelic deletions in the HBA1 and HBA2 genes (16p13.3). The pattern of inheritance is autosomal recessive.
Synonyms
Haemoglobin Barts hydrops
Haemoglobin Bart hydrops syndrome
Haemoglobin Bart's hydrops syndrome
Hemoglobin Bart hydrops syndrome
Hemoglobin Bart's hydrops syndrome (disorder)
Alpha thalassemia major
Hemoglobin Bart's disease
Haemoglobin Bart's disease
Hemoglobin Barts hydrops
Alpha thalassaemia major
Type http://www.w3.org/2002/07/owl#Class
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