Total reviews 411
Total reviews 411
Tests Included: 1
Est. 3-5 (business days) Turnaround
Specimen type: Blood
Quest Diagnostics Location
Most of the T4 in your body is bonded to protein, and a smaller portion (free) has not. This is why there is a free T4 test and a total T4 test. A free T4 test is usually preferred because from this test you can see how much is available for the body to use. This test can be ordered if a TSH has come back abnormal. Pregnancy can also affect your T4 levels.
Tests Included: 1
Est. 3-5 (business days) Turnaround
Specimen type: Blood
Quest Diagnostics Location
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Please do not exercise prior to testing. It is best that your blood is taken in a rested state.
Note: Turn around times on results are an estimate and are not guaranteed. The lab may need additional time due to holidays, confirmation/repeat testing, etc. You can contact us to discuss when your results should be ready and we will contact the lab on your behalf immediately.
| <1 Month | Not established |
| 1-23 Months | 0.9-1.4 ng/dL |
| 2-12 Years | 0.9-1.4 ng/dL |
| 13-20 Years | 0.8-1.4 ng/dL |
| >20 Years | 0.8-1.8 ng/dL |
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