Health guide
TSH and thyroid profile test: normal range and how to read it
A thyroid profile measures TSH along with T3 and T4, the hormones that set your metabolism. TSH from the pituitary gland is the most sensitive marker (it often moves before symptoms appear), which is why it is usually the first test. This guide explains how to read the numbers; for symptoms and what to do, see our thyroid problems guide. Fasting is not required.
Reviewed by Dr. Vishal Singh, Lab Director
When to check your thyroid
- Unexplained weight gain or loss
- Persistent tiredness or low energy
- Hair thinning, dry skin, or feeling cold
- Palpitations or feeling unusually hot (overactive)
- Irregular periods or trouble conceiving
- Already on thyroid medicine (for a dose review)
How to read TSH, T3 and T4
TSH usually runs about 0.4-4.0 µIU/mL. A high TSH most often means an underactive thyroid (hypothyroidism); a low TSH suggests an overactive one (hyperthyroidism). T4 and T3 show how much hormone the gland is actually making. TSH moves in the opposite direction to the thyroid hormones, which can be confusing. Your doctor reads them together.
Free vs total, and when to add tests
Reports may show total or free (FT3, FT4) hormones; free levels reflect the active, available hormone and are often preferred. If results are borderline or you have symptoms, your doctor may add thyroid antibodies (such as TPO) to look for an autoimmune cause like Hashimoto's.
This guide is for general information and is not a diagnosis. Always discuss your symptoms and results with a doctor. LabONE includes a free doctor consultation with every report.
Tests that help
Recommended panel
ThyroidShield
2 parameters in one panel
Frequently asked questions
What is a normal TSH level?
Roughly 0.4-4.0 µIU/mL for most adults. A high TSH usually points to an underactive thyroid and a low TSH to an overactive one; your doctor confirms with T3/T4.
Do I need to fast for a thyroid test?
No, fasting is not required. If you take thyroid medicine, give the sample before your morning dose unless your doctor advises otherwise.
Not sure where to start?
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