What diagnostic tests are available?  

Need More Info. I need more information to understand your question. Would you mind explaining a bit more?
Way too broad. There are literally thousands of tests used to reach a diagnosis (diagnostic tests). These can be clinical, imaging, laboratory, blood, serum, hair, urine, feces, etc. There are just way to many to even consider a short answer here. Maybe you should be more specific with what test was ordered.

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