Help. I think my husband has ADHD.

My husband lately has been displaying a lot of signs of ADHD - he is forgetful and disorganized, losing his keys all the time. He is super irritable lately and terrible at managing his emotions. His time management skills are poor and he is rarely on time to anything. He falls into staring at his phone for hours at a time. It's bad, and it's gotten worse over the years.

What is the best way to get him screened for ADHD?