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Tuesday, February 07, 2012

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Welcome to The Q&A with Elaine Moore. Registered members are invited to ask any question of Elaine Moore on autoimmune diseases, Graves' disease, other thyroid diseases and subconditions, laboratory work, traditional and complementary medicine, triggers and environmental influences, thyroid and immune disorders in pets and animals, and other relevant areas of inquiry.

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Questions are answered solely by Elaine Moore, a medical writer and clinical laboratory scientist, MT, CLS, with more than 30 years of experience in immunology. Moore has also authored and edited over a dozen books in the area of health sciences and is an editor for McFarland Publisher's Health Topics Series.

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The Q & A with Elaine Moore

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7/9/2010 5:49 PM

Joined: 5/19/2010

Posts: 5

my daughter's lab

Hello Elaine,

My 16 year old daughter did blood test for routine physical (fasting 12 hours) , her T3 Total is 60 (80-179ng/uL), TSH 1.18(0.5-4.3) and Free T4 is 1.0(0.0-1.4). She feels normal. My question is only Total T3 abnormal, what does it mean? Does she hyper/hypo or something else? I have Grave disease for 3 years. Thank you so much for your help.

Vicky

7/12/2010 11:35 PM

Elaine

Joined: 8/1/2008

Posts: 3166

Re: my daughter's lab

Hi Vicky,

Levels for total T3 and T4 measure both thyroid hormone and the proteins that carry it through the blood. In this form, thyroid hormone is inactive. Tests for free T3 and free T4 (FT4 and FT3) levels better represent thyroid status.

Levels of T4 and T3 can be low when binding protein levels are low. Binding proteins are highly influenced by estrogens and the total levels can vary during the menstrual cycle. Considering that her TSH is normal, I wouldn't be concerned about this result. If your daughter has repeat labs at some point, you might suggest that the doctor order FT4 and FT3 levels. Best, Elaine

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