Any gene or blood tests for adhd?

No: There are not any labs that can diagnose adhd or add.

Not yet : The tests we use for add are clinical-like getting examined with a stethoscope. But there are experimental contrast studies like fmri, pet & others are used in research to test for add. Many gene sequences have been identified with add, but none are useful for current diagnosis. Chromosome 17 & 22 are highly featured in add. The research goes on. It is highly familial so researchers focus there.