Overview
Mixed hemoglobin disorders encompass conditions where an individual has more than one type of abnormal hemoglobin or a combination of normal and abnormal hemoglobins. These can range from asymptomatic carriers to severe, life-threatening anemias.Diagnosis
Diagnosis is typically made through hemoglobin electrophoresis, which separates different types of hemoglobin.
Complete blood count (CBC) with red blood cell indices can suggest the presence of a hemoglobinopathy.
Genetic testing may be used for definitive diagnosis and carrier screening.Management
Management is largely supportive and depends on the specific hemoglobin disorder and its severity.
For severe forms, treatments may include blood transfusions, iron chelation therapy, and hydroxyurea.
Bone marrow transplantation is a potential curative option for some severe hemoglobinopathies.Special Populations
Pregnancy
Low maternal hemoglobin (<110 g/L) at any time during pregnancy is associated with adverse outcomes including low birthweight, preterm birth, stillbirth, perinatal mortality, and postpartum hemorrhage 1.
High maternal hemoglobin (≥130 g/L) may also have adverse consequences 1.
Iron-deficiency anemia is a common cause of low maternal hemoglobin and is associated with increased risks 1.Key Recommendations
Low maternal hemoglobin (<110 g/L) during pregnancy is associated with increased risks of low birthweight, preterm birth, stillbirth, perinatal mortality, and postpartum hemorrhage 1. (Evidence: Moderate)
High maternal hemoglobin (≥130 g/L) during pregnancy may also be associated with adverse maternal and infant health outcomes 1. (Evidence: Moderate)
Screening for hemoglobinopathies should be considered in populations with a high prevalence of these disorders 25. (Evidence: Expert opinion)References
1 Young MF, Oaks BM, Rogers HP, Tandon S, Martorell R, Dewey KG et al.. Maternal low and high hemoglobin concentrations and associations with adverse maternal and infant health outcomes: an updated global systematic review and meta-analysis. BMC pregnancy and childbirth 2023. link