Mariam is a 37 year old Asian lady who presents to you as she is feeling very tired. She is a new patient at the surgery and has recently immigrated from India due to her husband’s job. She has three young children who are all healthy. During the consultation she tells you that she has always been anaemic and has taken iron supplements on and off. You suspect that she may have thalassemia trait.
Which of the options below is most correct regarding thalassaemia trait?