Can i use a commercial spgt kits available in the market for someone diagnosed with fish blood?

Unknown: Not sure what you mean by a diagnosis of fish blood. Fish is a lab test done to look at dna sequences. Perhaps there is more formal medical term. Generally, would think that a kit designed to measure spgt in a sample of blood would work. You have to look at the specific test kit info to see if there are any interactions with any medications or conditions. I have seen this with bilirubin testing.