Common MML Test-Ordering Errors
Part 4: Overordered Tests
JAK2 on Blood and Bone Marrow
Free Thyroxine index (FTI) and T3 Uptake
Free T4 Assay Summary
July 2010
The free thyroxine index and T3 uptake offer no advantages over their newer replacement tests, but suffer from many more preanalytic and analytic variables. We believe that orders for free thyroxine index and T3 uptake should be questioned and, after educating the individual ordering those tests, replaced by free T4 tests. To learn more about this subject, please go to our Web site to access a Hot Topic on thyroid function testing. The Hot Topic was created by one of Mayo’s endocrinologists and provides a concise review of thyroid testing.
Free T4 Assay Summary |
Jump to section:
- Introduction
- Testing at Mayo Medical Laboratories
- Common MML Test-Ordering Errors
- Overordered Tests
- JAK2 Gene
- Outdated Thyroid Function Tests
- Thyroxine (T4)
- Assessing Thyroid Hormone Status in the Presence of Abnormal Binding Proteins
- Free Thyroxine Index (FTI)
- Free T4 Assays
- Free T4 Assay Summary
- Conclusion
- Questions?
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