Dear,

Transfusion Medicine is a very good and upcoming subject which has both diagnostic like immunohaematology and therapeutic modalities like plasma exchange , red cell exchange , intrauterine transfusions etc. Cellular therapies including stem cell and gene therapy are also coming up. Jobs are readily available in big corporate hospitals and also government faculties. It's definitely a very good branch to pursue for pg with a bright future scope. But also it depends on your interest as well. Only pursue if you are deeply interested in this.

Hope this helps!