No Single Test Diagnoses ADHD. Ask What Else Was Checked.

What did the two companies announce?

On September 25, 2026, Firefly Neuroscience and NeuroSigma announced a partnership. NeuroSigma makes the Monarch eTNS System. The FDA has cleared it for some children with ADHD. It sends mild stimulation to a nerve through a patch on the forehead. The child wears it during sleep.

Firefly makes Evoke, a platform for brain-wave testing (EEG). The FDA has cleared Evoke too. Firefly says Evoke uses AI to give doctors brain measures. The deal brings the Monarch device to clinics that already use Evoke. These include psychiatry, neurology and behavioral health practices across the country.

“Clinicians need better tools to understand how an individual patient’s brain is functioning, more treatment options from which to choose and objective ways to evaluate changes over time,” Firefly CEO Greg Lipschitz said, as quoted by Medical Device Network. Does either product help a given child? That is for the family and their clinician to judge. Our question here is a different one.

Why does no single test settle ADHD?

It is easy to hope for one test with one clear answer. The CDC says that test does not exist. Its page on diagnosing ADHD was updated on July 7, 2026. It says:

“There is no single test to diagnose ADHD, and many other problems, such as sleep disorders, anxiety, depression, and certain types of learning disabilities, can also have symptoms similar to ADHD.”

A psychologist, a psychiatrist or a pediatrician makes the diagnosis. The CDC says they ask parents, teachers and other adults how the child acts. That means at home, at school and with other kids.

The American Academy of Pediatrics (AAP) points the same way. The newest AAP guideline we found is from 2019. Its current status is not confirmed. Doctors should see the signs in more than one part of a child’s life. They should see the problems the signs cause there too. The reports come from parents, teachers and others who know the child. The doctor “should also rule out any alternative cause.” The doctor should also “at least screen for comorbid conditions.” Those are other conditions that come along with it. The list includes anxiety, depression, learning and language problems, sleep apnea and tics.

That is the frame we hold. Trouble paying attention is something you see. It is a sign, not yet an answer. A good evaluation treats it as a question with more than one possible source. We push back on one idea. It is the idea that one test or one label tells the whole story. Our page Attention Difficulty vs ADHD covers who diagnoses it. It also covers what else to check.

What should I ask before any ADHD label?

Each of these is worth checking for its own sake, alongside attention.

Sleep. The CDC names sleep disorders. The AAP names sleep apnea. Ask the pediatrician about snoring or pauses in breathing at night.

Eyes and ears. The CDC says one step is a medical exam with hearing and vision tests. It is there to rule out other problems. Ask for an eye exam that checks close-up vision too.

Worry. Both the CDC and the AAP name anxiety. To us, avoiding hard work looks a lot like drifting off. A mental-health professional is the person to ask.

Reading, writing and math. Both name learning problems too. If reading the page is hard, he will look distracted. Check both. One does not replace the other.

The CDC page puts no number on how often these look like ADHD. The research files we hold give no rate either. That is why each one gets checked, not guessed.

Here is the tradeoff. A full evaluation asks more of you. There are forms, teacher reports, and maybe more than one visit. It takes longer than one test would. In return, the answer rests on your whole child.

Ask the clinician three things. Who did you hear from besides me? What did you rule out, and how? Were sleep, eyes, ears, worry and learning checked? New tools will keep coming to clinics. Your questions stay the same. As we put it: “Nobody will ever advocate for your child as hard as you will.”