CBC & ferritin
Anemia and iron stores when history suggests.
Labs & Blood Tests · Topic guide
Labs When Focus, Fatigue & Brain Fog Overlap
Blood tests do not diagnose ADHD. Adult ADHD evaluation is clinical. Selected laboratory testing may sometimes help assess other medical contributors to similar symptoms—when a clinician judges testing appropriate.
Available across California · Texas · Pennsylvania · Florida
Not sure which tests make sense? We’ll help.
Already have results? We’ll help interpret them too.
Blood tests do not diagnose ADHD.
When testing may be appropriate
Not every symptom requires laboratory testing. These are common reasons clinicians consider it.
- Fatigue, brain fog, or concentration issues with clues suggesting iron, thyroid, B12, or metabolic contributors
- A clinician wants to evaluate overlapping medical factors alongside ADHD assessment
- Monitoring needs related to treatment that your clinician has already discussed
Commonly discussed tests
Examples only—availability and panels vary on the storefront. Your clinician individualizes orders.
TSH
Thyroid screening when clinically indicated.
Vitamin B12
When deficiency risk is present.
Metabolic markers (e.g., A1c)
When metabolic contributors are relevant.
What these tests cannot tell you
Clear limits protect you from false certainty.
- No blood test diagnoses ADHD.
- Normal labs do not rule out ADHD.
- Abnormal labs do not prove symptoms are “not ADHD.”
ADHD and medical contributors can coexist. Labs are a supporting tool for differential thinking—not a shortcut around structured clinical evaluation.
Related care & reading
Services
Guides
More lab topics
Frequently asked questions
No. Blood tests do not diagnose ADHD. Evaluation is clinical, using history and validated tools when appropriate.
To evaluate other contributors to fatigue, concentration problems, sleep disruption, or cognitive symptoms—such as thyroid abnormalities, anemia, iron or B12 deficiency, or metabolic issues—when indicated.
Labs are not a substitute for ADHD evaluation when ADHD is the primary question. They may be complementary when medical overlap is suspected.
Browse tests—or talk it through
Transparent direct-pay pricing on the storefront. Physician guidance when you need help choosing or interpreting.