Thyroid Function Tests - PBSci 7
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14 Terms
TSH test
What is the best initial screening test for thyroid function?
TSH test
A high result indicates primary hypothyroidism
TSH test
A low result indicates hyperthyroidism
Free T4
This test measures the unbound, active fraction of thyroxine
Free T4
A low result confirms the diagnosis of hypothyroidism
Free T4
A high result confirms the diagnosis of hyperthyroidism
Free T3
This test is useful for diagnosing T3-toxicosis in early hyperthyroidism
Free T3
This test is not routinely used for thyroid screening
Total T4/T3
This test measures both protein-bound and free hormone
Total T4/T3
Results are less accurate and affected by changes in binding proteins
Thyroid autoantibodies
These tests are not for routine screening but help identify autoimmune causes
Thyroid autoantibodies
These tests help diagnose conditions like Hashimoto's and Graves' disease
Primary hypothyroidism
When TSH is high and Free T4 is low it indicates what?
Hyperthyroidism
When TSH is low and Free T4 is high it indicates what?
Note 
Flashcards (26)