Dr. Joseph . Collins, RN, ND
Ideal Group of Thyroid Tests
When assessing thyroid function, it is critical that the tests be done properly. Incomplete tests can result in making decisions that are based on incomplete information. The following is a list of lab tests that will completely evaluate thyroid function. Doing only part of these tests provides only part of the information. Once we all understand what each test is telling us, and why it is important, there should be no problem getting these tests done.
Lab Tests to Properly Evaluate Thyroid Function
- TSH (thyroid stimulating hormone)
- Free T4 or Total T4 (thyroxine)
- Free T3 or Total T3 (triiodothyronine)
- Reverse T3 (reverse triiodothyronine)
- Anti-thyroid peroxidase antibodies (anti-TPO)
- Anti-thyroglobulin antibodies (anti-TG)
Collectively, these tests measure:
Look Beyond “Normal”
Percentile Analysis & Quartile Analysis
- Percentile Analysis = (PV-LR) / (HR-LR) x 100
- PV = Patient Value
- LR = Low Reference Range
- HR = High Reference Range
A Cautionary Note on TSH
Free T3 : Free T4 Ratio
Patients with Metabolic syndrome patients had lower FT3/FT4 ratio. They also had higher fasting blood glucose, higher triglycerides, higher systolic and diastolic blood pressure and lower HDL-cholesterol.  A higher FT3/FT4 ratio is associated with decrease risk of death in patients with dilated cardiomyopathy , and increased ejection fraction in patients with congestive heart failure .
Free T3 : Reverse T3 Ratio
Avoiding Inconclusive Tests
About the Author
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