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A 66-year-old female asked:

can you have tsh [1.09] and t free[o.66] which are within normal parameters and still have low thyroid function?

2 doctor answers2 doctors weighed in
Dr. Robert Killian
General Practice 28 years experience
Thyroid: Not usually. Why do you ask? What are your problems? Have you considered that you may also be vitamin d deficient?
Dr. Alan Feldman
Endocrinology 41 years experience
No: If your TSH and free T4 levels are normal, you do not have low thyroid function. However, a free T4 of 0.66 would be low in most labs. Low free T4 with a normal TSH could indicate a pituitary problem.

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Last updated Jan 15, 2015

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