What does a high TSH and normal free T4 mean?

What does a high TSH and normal free T4 mean?

A normal TSH and normal T4 show a normal thyroid. A low TSH and high T4 generally means an overactive thyroid. A high TSH and low T4 means an underactive thyroid.

Which is more important TSH T3 or T4?

Because T4 is converted into another thyroid hormone called T3 (triiodothyronine), free T4 is the more important hormone to measure. Any changes show up in T4 first. T3 and T4 help to control how your body stores and uses energy (metabolism). The thyroid hormones also help control many of your body’s other processes.

Can you have Graves disease with normal T3 and T4?

Graves’ disease may present only with subclinical hyperthyroidism (normal total and free T3 and T4 with suppressed TSH levels).

Can you still have thyroid problems with a normal blood test?

In fact, your TSH blood tests may say that you are clinically euthyroid (normal), but you may still experience many of the same problems you had prior to treatment, including: Chronic fatigue. Weight gain despite no change in diet. Feeling cold all the time.

Can you have hypothyroidism with normal TSH and T4?

Results. Patients with symptoms consistent with hypothyroidism but with normal TSH values in the range of 1–4 IU/mL and normal free T4 (FT4) values by immunoassay measurements were confirmed to be biochemically hypothyroid following measurements of thyroid hormones by mass spectrometry.

Is your free T4 really in the normal range?

Typical results in adults for the free T4 test generally range from 0.9 to 2.4 nanograms per deciliter (ng/dL). Like total T4 in adults, free T4 also varies in children according to age.

What is TSH reflex to free T4?

TSH w/ Reflex Free T4– Thyroid Stimulating Hormone – This test is used to identify hypothyroidism and hyperthyroidism. TSH is also useful to monitor thyroid hormone replacement therapy. Abnormal TSH levels should be followed by a Free T4 test, since Free T4 is more specific than TSH and serves to confirm thyroid dysfunction.

What does high TSH and T4 mean?

Since the pituitary gland would normally release TSH if the T4 is low, a high TSH level would confirm that the thyroid gland (not the pituitary gland) is responsible for the hypothyroidism. If the T4 level is low and TSH is not elevated, the pituitary gland is more likely to be the cause for the hypothyroidism.

What is free T4 levels mean?

The free T4 index includes a formula that compares free and bound T4. High levels of any of these tests (total T4, free T4, or free T4 index) may indicate an overactive thyroid, also known as hyperthyroidism. Low levels of any of these tests (total T4, free T4, or free T4 index) may indicate an underactive thyroid, also known as hypothyroidism.