Gynaecology & Obstetrics The kleihauer test for detecting fetal erythrocytes is based on the fact that : A Adult erythrocytes are larger than those of foetus B hbA has higher 02 affinity than hbF C hbF is more resistant to acid elution D hbA takes erythromycin stain less than hbF 💡 Explanation The kleihauer test for detecting fetal erythrocytes is based on the fact that : ✓ Correct Answer: C. hbF is more resistant to acid elution