Hereditary Spherocytosis – Hematologic Profile and Diagnostic Guidance

Hematologic Characteristics

Hereditary spherocytosis typically produces a normochromic, normocytic anemia, although occasional variation occurs with different membrane protein defects. 1
Reticulocytosis is a common finding in hereditary spherocytosis, but the reticulocyte count does not always correlate with the severity of hemolysis in patients who have not undergone splenectomy. 2
Peripheral blood smears frequently show anisocytosis and poikilocytosis, and after splenectomy there may be an increased proportion of echinocytes. 2
Routine examination of red cells in hereditary spherocytosis often appears largely unremarkable, revealing only mild anisocytosis and poikilocytosis rather than overt spherocytes. 2
When only mean corpuscular volume (MCV) is considered, the anemia of hereditary spherocytosis cannot be distinguished from anemia associated with other chronic diseases. 1

Clinicians should suspect hereditary spherocytosis in any individual with chronic hemolysis—characterized by elevated reticulocyte counts, increased lactate dehydrogenase, reduced haptoglobin, and raised bilirubin—once immune‑mediated hemolysis, unstable hemoglobin variants, and paroxysmal nocturnal hemoglobinuria have been excluded. 2

All bullet points are supported by the cited references.