[plumeria]

How does one find out being a slow or a fast metabolizer? DNA test?

[aantix]

Get your dna sequenced. A simple 23andme test would do.

https://www.geneticlifehacks.com/caffeine-metabolism-and-you...

Like the other commenter alluded to, if you consume caffeine and your BP remains really elevated past two hours, you’re probably a slow metabolizer.

[AstralStorm]

You can do the basic continuous blood pressure monitoring. Not super precise but should work for categorizing.