Pathology In sickle cell disease, which of the following does not influence the degree of sickling of red cells? A Hereditary persistence of fetal hemoglobin B Intracellular pH C Intake of primaquine D Co-existing a-thalassemia 💡 Explanation In sickle cell disease, which of the following does not influence the degree of sickling of red cells? ✓ Correct Answer: C. Intake of primaquine