This is fast and easy to use way to determine your blood type at home. It is called the Eldon Blood Type Kit.
The above video if four minutes long and will walk you through how to use one of these and how to determine
what the results mean. Knowing what your blood type is important in order to optimize your diet if you’re immunocompromised. This is based on Dr. D’Adamo’s work that can be found here. A convenient list of blood type correct foods can be found right here. There is an entire database of Blood Type Recipes, here.
Below is a reference chart to compare your results to:

Eldon Blood Type Kit Results