<prompt> Hb A 2 concentration in thalassemia trait is ?11-2.52.5-3.53-5  <response>: Ans. is d i.e., 3.5 Nestrof test o This test is being widely used in India and other developing countries in thalassemia screening programmes. o The cases which are positive, subjected to HbA2 estimation for confirmation of thalassemia trait. 