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  • Amy Leahy

"Blood Tests for Thyroid Health"

" My blood test results are fine & why that isn't always correct"


The range listed on blood tests is dictated by the population average not the healthiest average and can vary greatly from lab to lab.

Thyroid tests can be difficult to interrupt and physical symptoms must be considered.

Due to the test result range not reflecting optimal thyroid levels, many thyroid issues go undiagnosed.

TSH: the standard range is 0.4-5.0mIU/L.

According to the Australian Thyroid Foundation, the optimal TSH level is around 1. If your TSH is higher or low than this range then a free T3 and T4 test are recommended. The best practice is to do TSH, FT3, FT4 in one blood test. It is very hard to determine thyroid function on the TSH test alone.

T3 and T4 results should be interpreted in conjunction with each other and the TSH.

T3 test range: 10-20 (optimal is the high end of the normal range)

T4 test range: 4-8 (exactly in the middle of the range)

For example:

High TSH, FT4 Normal, FT3 Normal: mild subclinical hypothyroidism

High TSH, Low FT4, low or normal FT3: hypothyroidism

Low TSH, Normal FT4, normal FT3: Mild subclinical hyperthyroid

Low TSH, High or normal FT4, High or normal FT3: hyperthyroidism


Thyroid antibodies: are given a range of under (<) a set amount. The presence of antibodies of any over the detectable amount is something to watch as this means there is an autoimmune component to your thyroid issues. Early intervention could keep antibodies low and slow the progression of the disease.

A degree qualified health practitioner (like me) can help you interrupt your results.


The information found on ChickpeaNutrition.com.au or any of its other platforms is intended for informational and educational purposes only. Any statements made are not intended to diagnose, cure, treat or prevent any disease or illness. Please consult with your medical practitioner before making any changes to your current diet and lifestyle.


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