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Interdisciplinary CompetenceMolecular Diagnostics
Know how in the analysis of genetic material.
For the benefit of patients.

IllnessThalassaemia alpha


Short information

Two guideline-curated single gene sequence analyses according to the clinical suspicion Thalassemia alpha

Number of genes
2 Accredited laboratory test
Examined sequence length
0,9 kb (Core-/Core-canditate-Genes)
- (Extended panel: incl. additional genes)
Analysis Duration
on request
  • EDTA-anticoagulated blood (3-5 ml)
Diagnostic indications



Gene panel

Selected genes

NameExon Length (bp)OMIM-GReferenz-Seq.Heredity
HBA1429NM_000558.5AD, AR
HBA2429NM_000517.6AD, AR

Informations about the disease

Clinical Comment

The syndromes of alpha-Thalassemia are based on disturbed alpha-globin chain synthesis. The causes are usually deletions of one or more of the four alpha-globin genes (normal: aa/aa, pathological: a-/aa to --/--), more rarely point mutations. The severity of the clinical pictures of the different alpha-Thalassemia subtypes correlates with the number of affected HBA genes. Two alpha-Thalassemias cause severe health problems, especially Hb-Bart hydrops fetalis syndrome (--/--; Hb Bart syndrome, Thalassemia major) and less dramatically, HbH disease (--/a-). Clinically inapparent is the minima form, the alpha-Thalassaemia minor is detected by laboratory chemistry. HbH disease causes significant deviations from the norm in blood count data already in neonates; in adults there is hemolytic anemia. Hb-Bart syndrome is characterized by severe anemia, hepatosplenomegaly, heart defects and urogenital malformations, so that children usually die very early or are stillborn. Inheritance is complex due to four affected loci, expressiveness is variable. If HBA deletions and sequence deviations are excluded, deletions are very rarely detected in the MCS-R2 region 40 kilobases 5`of the HBA gene cluster. Thus, a suspected clinical diagnosis can practically always be excluded by an inconspicuous finding.

(Basic diagnostic genes: HBA1, HBA2)

Reference: https://www.ncbi.nlm.nih.gov/books/NBK1435/


  • Alias: Alpha Thalassämie
  • Alias: Alpha-thalassemia intermedia
  • Allelic: Erythrocytosis 7 (HBA1, HBA2)
  • Allelic: Heinz body anemia (HBA1, HBA2)
  • Allelic: Hemoglobin H disease, deletional + nondeletional, HbH disease (HBA1, HBA2)
  • Allelic: Methemoglobinemia, alpha type (HBA1)
  • Thalassemia, alpha- (HBA1)
  • Thalassemia, alpha- (HBA2)
Heredity, heredity patterns etc.
  • AD
  • AR
ICD10 Code

Bioinformatics and clinical interpretation

No text defined