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Total vs free t4

A 38-year-old member asked:
Dr. Alan Feldman
Endocrinology 41 years experience
Thyroid tests: A "free T4" level is a measure of the biologically active amount of thyroid hormone in the blood, circulating "free" (rather than attached to blood pr... Read More

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A 45-year-old female asked:
Dr. David Sneid
Endocrinology 41 years experience
That number: is outside of the possible range of results for that test, so something is wrong somewhere. Check w/your doctor.
A 28-year-old male asked:
Dr. Stanley Schwartz
Endocrinology 52 years experience
See below: T4 is the main hormone produced by the thyroid gland total T4 is amount in blood stream attached to albumin, as well as 'free' in blood stream. ... Read More
A 30-year-old female asked:
Dr. David Geffner
Endocrinology 54 years experience
Yes: Total T4 reflects T4 bound to proteins in your blood. Free T4 measures the amount of T4 that is free and not bound so that it can be metabolically act... Read More
A 19-year-old male asked:
Dr. Quang Nguyen
Specializes in Endocrinology
Hyperthyroidism : Hyperthyroidism can lead to dizziness. Find out the cause for the hyperthyroidism and get it treated accordingly.
A 25-year-old male asked:
Dr. Donald Colantino
Internal Medicine 61 years experience
Digestion: That level is at the lower limit of normal. Knowing your tsh level would be most helpful but I doubt that your thyroid is underactive. What are your d... Read More
A 21-year-old male asked:
Dr. Cynthia Villacis
Family Medicine 22 years experience
Unsure: If someone has changed the way they take their thyroid medications - if you were taking w/ food and now on empty stomach, if there is a new batch of ... Read More
A 44-year-old member asked:
Dr. Stanley Schwartz
Endocrinology 52 years experience
Every lab ..: Different ranges of normal- so both need to be in normal range of that lab.
A 21-year-old female asked:
Dr. Michael Kleerekoper
A Verified Doctoranswered
A US doctor answeredLearn more
Thyroid labs: Every medical laboratory has different values for the labs they are doing. Please have your doctor tell you what is the normal range for Free T4 and T... Read More
A 38-year-old member asked:
Dr. Vered Lewy-Weiss
A Verified Doctoranswered
A US doctor answeredLearn more
Not Necessarily: Your ft4 needs to be assessed when taken into consideration with TSH and other tests. Also, the lab assay for ft4 may be unreliable as in many facilit... Read More

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