I doubt if they are doing every blood test that has been devised. The chances are that they will be looking at the numbers of different types of blood cells - this will show up anaemia, leukaemia, and may indicate other classes of problem such as infection.
They have probably looked at kidney...
It is racist if you automatically assume that they are inferior. I do not believe it is racist to give a reasoned opinion that some of their cultural practises are wrong or inferior e.g. the genital mutilation inflicted on girls from some african countries is WRONG.
It is racist if you verbally...
You might be able to help in a local family history centre, there is also the possibility of the Local Authority Record Office or Archive.
Contact your Local History Society and have a talk to some of its members who may have specialised local knowledge of openings.