Overview & Definition
Sickle Cell Disease (SCD) is a hereditary blood disorder where abnormal hemoglobin (HbS) causes red blood cells to assume a rigid, crescent sickle shape. These rigid cells block small blood vessels, leading to organ damage and painful crises.
Types & Classification
- Sickle Cell Anemia (HbSS)
- Sickle Hemoglobin-C Disease (HbSC)
- Sickle Beta-Plus Thalassemia
- Sickle Beta-Zero Thalassemia
- Sickle Cell Trait (HbAS)
Underlying Causes & Risk Factors
- Point mutation in the Beta-globin gene (HbS allele)
- Autosomal recessive inheritance from carrier parents
Common Symptoms & Warning Signs
Diagnostic Evaluation
Accurate diagnosis requires comprehensive laboratory investigation under expert hematological supervision:
- 🔍 Sickling Test & Solubility Assay
- 🔍 High-Performance Liquid Chromatography (HPLC)
- 🔍 Hemoglobin Electrophoresis
- 🔍 CBC and Reticulocyte Count
Treatment Options & Clinical Management
- 💊 Disease-Modifying Agents – Hydroxyurea (induces fetal hemoglobin HbF), Voxelotor (inhibits HbS polymerization), L-Glutamine, and Crizanlizumab (monoclonal antibody reducing vaso-occlusive crises).
- 💊 Vaso-Occlusive Pain & Hydration Protocols – individualized analgesia (NSAIDS, opioids) and intravenous rehydration during acute pain crises.
- 💊 Infection Prevention – daily oral penicillin prophylaxis in young children and comprehensive pneumococcal, meningococcal, and influenza immunizations.
- 💊 Blood Transfusion Therapy – simple or automated red cell exchange transfusion for acute chest syndrome, stroke prevention, or severe anemia.
- 💊 Curative Cell Therapies – Allogeneic Hematopoietic Stem Cell Transplant and FDA-approved autologous CRISPR gene editing therapy (Exagamglogene autotemcel) for eligible severe disease.
Frequently Asked Questions
In infants (starting around 5–6 months of age), early signs include painful swelling of the hands and feet (dactylitis), persistent paleness, jaundice (yellowing of eyes and skin), frequent bacterial infections, and severe unexplained episodes of bone or abdominal pain (vaso-occlusive crisis).
Diagnosis is confirmed via newborn screening panels, solubility sickling tests, High-Performance Liquid Chromatography (HPLC) or Hemoglobin Electrophoresis (quantifying HbS, HbF, HbA), Complete Blood Count with reticulocyte count, and DNA mutation analysis.