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As with the hypothyroid patient, There is no single blood test that is definitive for hyperthyroidism. The hormonal tests must be interpreted together with the history, physical exam and the other clinical findings. TT4 and T T3

are tests that are recommended for a “quick” diagnosis (Stortz, et al., 2004). Occasionally, these results are within normal range when the cat is hyperthyroid. If the veterinarian still suspects hyperthyroid, then fT3 and TRH can be performed to help support the diagnosis.

 

 

 

 

 

TT4 =Total thyroxine

TSH= thyroid stimulating hormone

TT3 = Total Triiodothyronine

fT3= Free Triiodothyronine

TRH= Thyrotropin releasing hormone

 

Remember, these tests should not be used as the sole means of diagnosis. These tests are supportive diagnostic tests used in conjunction with the clinical signs and other laboratory tests.

 

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