What does it mean if your TSH is low but your T3 and T4 are high?
A low level of TSH and high levels of T3 and/or T4 usually means you have an overactive thyroid. Doctors may refer to these measurements as “free” T3 and T4 (FT3 and FT4). What’s considered normal varies depending on things such as your age and the exact testing technique used by the laboratory.
What does it mean if your TSH and T3 are low?
Low T3 levels may mean you have hypothyroidism, a condition in which your body doesn’t make enough thyroid hormone. T3 test results are often compared with T4 and TSH test results to help diagnose thyroid disease.
When TSH is low and T3 and T4 are normal?
Subclinical hyperthyroidism is a condition in which you have low levels of thyroid stimulating hormone (TSH) but normal levels of T3 and T4. T4 (thyroxine) is a major hormone secreted by your thyroid gland.
Do regular blood tests show thyroid problems?
A blood test for levels of TSH is the most sensitive test for determining whether you have hypothyroidism. Most laboratories use 0.45 – 5.00 mIU/L as a normal reference range for TSH. People with TSH between 5.00 and 9.99 mIU/L often have no symptoms (known as subclinical hypothyroidism), but some do.
Can you have hypothyroidism with a normal TSH level?
Some people treated for hypothyroidism may still experience symptoms even if blood tests show that their thyroid stimulating hormone (TSH) levels are well within the normal range. The reasons for this are complex, but the bottom line is that having a normal TSH value doesn’t necessarily mean that all of your symptoms will go away.
What is a normal T4 level for a normal thyroid?
The normal range for free T4 in adults is 4.6 to 11.2 micrograms per deciliter (mcg/dL). A normal T4 test result means your thyroid gland works like it should. A high T4 result could mean you have hyperthyroidism.
What is the TSH W/ reflex free T4 test?
Finally, The TSH w/ Reflex Free T4 Test is ordered when a patient has symptoms linked to hyperthyroidism or hypothyroidism, and is also often requested if there are abnormal or out of range results on the TSH test.
What happens if your TSH and T4 levels are different?
A discrepancy between TSH levels and free T4, or between TSH levels and your symptoms, should alert your healthcare provider of a test inaccuracy. Thyroid antibodies: These may also affect TSH levels in people who may or may not have a thyroid condition.