TSH
Common first-line screening test.
Labs & Blood Tests · Topic guide
Thyroid Testing
Thyroid testing can be reasonable when symptoms, history, or exam findings raise concern. It should not be treated as the default explanation for every case of fatigue or brain fog.
Available across California · Texas · Pennsylvania · Florida
Not sure which tests make sense? We’ll help.
Already have results? We’ll help interpret them too.
Not sure which tests fit? Start with a clinical conversation.
When testing may be appropriate
Not every symptom requires laboratory testing. These are common reasons clinicians consider it.
- Fatigue, cold intolerance, weight change, hair changes, or mood shifts that raise thyroid questions
- Known thyroid disease needing monitoring
- Family history or other clinical risk factors your clinician considers relevant
Commonly discussed tests
Examples only—availability and panels vary on the storefront. Your clinician individualizes orders.
Free T4
Often added when TSH is abnormal or clinical suspicion is higher.
Additional thyroid tests
May be considered when clinically appropriate—not routinely for everyone.
A thoughtful starter set (education, not a product list)
Most thyroid questions begin with a focused screen. Extra thyroid assays are added when results or history justify them—not by default.
- TSH
- Free T4 when TSH is abnormal or suspicion is higher
Availability varies; a clinician individualizes which tests—if any—fit your history. This is education, not a catalogue of SKUs.
What these tests cannot tell you
Clear limits protect you from false certainty.
- A thyroid panel does not diagnose depression, ADHD, or perimenopause.
- Brain fog has many contributors; abnormal TSH needs clinical correlation.
- Normal thyroid labs do not exclude every cause of fatigue.
TSH and related values are interpreted against symptoms, medications (including biotin interference in some assays), pregnancy status when relevant, and trends—not a single cutoff in isolation.
Related care & reading
Services
Guides
More lab topics
Frequently asked questions
Thyroid testing can be reasonable when symptoms or history raise concern, but brain fog has many possible contributors. A clinician can help decide whether TSH and related tests are useful for you.
TSH is a common starting point. Free T4 or other tests may be added based on results and clinical context. More testing is not always better.
Sometimes thyroid dysfunction contributes; often other factors are involved too. Interpretation and follow-up planning belong with a clinician.
Browse tests—or talk it through
Transparent direct-pay pricing on the storefront. Physician guidance when you need help choosing or interpreting.