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77. Which of the following Hb types coelute with HbA2 in HPLC ?
 HbD Iran
 Hb Lepore
 All of these
Answer =  All of these
Hb E, Hb D Iran and Hb Lepore all coelute with HbA2.
The table below shows conditions in which HBA2 window will show increased area or increased concentration.
NOTE if HbA2 is =/> 10% then diagnosis other than Beta Thal trait should be considered
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