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A member asked:
What can affect a t4 blood test to be diagnosed as having hypothyroidism?
5 doctors weighed in across 2 answers
Inappropriate: A T4 is not an appropriate test to diagnose hypothyroidism it is a protein bound test and is affected by many things. An ultra sensitive TSH is the test of choice.
Answered 1/15/2015
5.7k views
Many Things: Pregnancy, use of birth control or estrogen pills if female, testosterone levels if male, liver disease, kidney disease, and nutritional status can all affect levels of thyroid binding proteins, and the level of total T4 needed to maintain the free T4 in the desired range. While free T4 is a better reflection of thyroid status than total t4, the TSH level is best at measuring what's right for you.
Answered 6/18/2022
5.7k views
Related Questions
A member asked:
On 112mcg of levothyroxine for hypothyroid. Yearly blood results T4 free was 1.29 and TSH was 6.9. How much should dr. adjust my meds? When to retest?
4 doctors weighed in across 2 answers
A member asked:
I have been taking levothyroxine 150 MCG for my hypothyroid and recently had blood work done. My TSH was 0.02 and my T4 reflexive was 1.59 normal?
A doctor has provided 1 answer
A member asked:
Hypothyroid for yrs, 150mcg levothyroxine. Blood results: T4 1.56 (WNL of .8-1.8) and TSH 0.11 (low .4-4.0). Called Dr. thoughts? med adjust needed?
A doctor has provided 1 answer
A member asked:
I have hypothyroidism but im tired all the time and im cold alot what can i do I have normal blood levels and take levothyroxine for it T3 (liothyronine) T4 TSH ok?
A doctor has provided 1 answer
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