
Medline Plus Medical Encyclopedia
Tests, Results and Information:
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T4
http://www.nlm.nih.gov/medlineplus/ency/article/003517.htm
T3
http://www.nlm.nih.gov/medlineplus/ency/article/003687.htm
TSH
http://www.nlm.nih.gov/medlineplus/ency/article/003684.htm