Alpha thalassemia quiescent carriers is one of the clinical subtypes of alpha thalassemia, also known as alpha thalassemia quiescent carriers. The molecular basis of α-thalassemia quiescent carriers is the deletion or point mutation of the α2 and α1 genes, and their heterozygotes retain three a-genes (-a/aa, aa/aa) when an α-pearl protein gene is mutated, and they usually present as α-thalassemia quiescent carriers. Alpha thalassemia quiescent carriers do not have any symptoms such as anemia and need to be genetically diagnosed in order to be identified. Although they do not develop the disease themselves, they can pass the mutated genes to the next generation, so large-scale screening and diagnosis of alpha thalassemia quiescent carriers is a necessary preventive measure. If you are an α-thalassemia quiescent carrier, you need to go to a regular hospital for genetic counseling before you plan to have a child.