Can response to finasteride be predicgted?

Is there a way to predict if you are going to respond or not? Like are there any patterns of hair loss that Finasteride significantly does not work for?

Not everyone responds to finasteride. You may not be a responder; however, if you are going to take it, stay on a regular routine and do it for at least a full year. Privately, I have been told that a new test will soon be available that will tell who will and who will not respond to this drug.