T4 test : Normal Values & Results (Thyroxine test)

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You are here : AllRefer.com > Health > Tests & Exams > T4 test : Normal Values & Results

T4 test

Alternate Names : Thyroxine test

Normal Values

A typical normal range is 4.5 to 11.2 micrograms per deciliter (mcg/dL).

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What do Abnormal Results Mean?

Greater than normal levels of T4 along with low levels of TSH may be due to conditions that involve an overactive thyroid, including:

Early Hashimoto's disease
Graves disease
Germ cell tumors
High levels of the protein that carries T4 in the blood (can occur with pregnancy, use of birth control pills or estrogen, liver disease, and as part of an inherited condition)
Iodine-induced hyperthyroidism
Subacute or chronic thyroiditis
Toxic multinodular goiter
Trophoblastic disease

Lower than normal levels of T4 may indicate:

Hypothyroidism (including Hashimoto's disease and several other disorders involving an underactive thyroid)
Illness
Malnutrition or fasting
Use of certain medications

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T4 test : Definition
T4 test : Why is the Test Performed?
T4 test : How is the Test Performed?
T4 test : How to Prepare for the Test?
T4 test : How will the Test Feel?
T4 test : Risks
T4 test : Normal Values
T4 test : What do Abnormal Results Mean?
T4 test : References
T4 test : Pictures & Images
Blood test

Review Date : 6/17/2008
Reviewed By : Elizabeth Holt, MD, PhD, Assistant Professor of Medicine, Section of Endocrinology and Metabolism, Yale University. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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