Not yet. Medical science has progressed to where it's starting to become possible to investigate this in a clinical setting, so home tests aren't going to become available just yet. One will have to resign to doing what has been done previously which is to look at how a person lives their lives and inferrence from that. I'm not a doctor, but having a pronounced need for variety and change is somewhat indicative. Also, if someone intuitively seeks out dopaminergic foods and drinks that's an indicator also (dark chocolate, foods rich in tyrosine). It's not uncommon for a person that's low in dopamine to become noticably relaxed after a high-carbohydrate meal as that meal would elevate serotonin and when dopamine is low and serotonin is high you become chill. People low in dopamine tend to be addictive. Sugar-bugs, coffee-fiends, sometimes adrenaline-junkies.

Talk to a doctor - self-medication is a risky endeavour, especially where mental health is concerned.

In an ideal world, sure. But not everyone is willing to talk to a doctor, or indeed anyone.

Then they have worse problems that their medication...