What is a normal TSH level?

The standard normal range for TSH is 0.5 to 5.0 mIU/L for most adults. TSH above 5.0 typically suggests hypothyroidism. TSH below 0.5 typically suggests hyperthyroidism. Some integrative medicine providers use a narrower optimal range of 1.0 to 2.5 mIU/L. Your results will include the reference range used by the specific lab that processed your sample.

What is the difference between TSH, T3, and T4?

TSH is produced by the pituitary gland and is the most sensitive thyroid screening marker. T4 is the primary hormone produced by the thyroid, most of which is inactive until converted to T3. Free T3 is the biologically active form your cells actually use. Testing all three gives the most complete picture of thyroid function, particularly for people with normal TSH but ongoing symptoms.

What are the symptoms of an underactive thyroid?

Common symptoms of hypothyroidism include unexplained weight gain, chronic fatigue, brain fog, depression, hair loss, dry skin, cold intolerance, constipation, slow heart rate, and irregular menstrual cycles. These symptoms develop gradually and are often mistaken for stress, aging, or depression. A TSH test is the fastest way to rule out thyroid dysfunction as the underlying cause.

Can I order thyroid blood tests without a doctor?

Yes. Personalabs provides the physician-signed lab order as part of your purchase. Order online, visit any Labcorp patient service center near you, and get results in your secure account within 24 to 48 hours. No referral, no insurance, no doctor visit required.

Thyroid Blood Tests Online — TSH, T3, T4

Parathyroid Hormone (PTH) Plus Calcium Blood Test

This test is used to find out the cause of calcium imbalances and to evaluate parathyroid function. This test…

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Total Thyroxine (T4) Blood Test

Also Known As Total Tetraiodothyronine, Total T4 Concentration, Thyroxine Test by Equilibrium Dialysis, Thyroxine Screening Purpose of the Total Thyroxine…

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