Feline Hypothyroidism Suspected
Requires T4 and possibly fT4 Testing
Which of the following symptoms does the cat have?
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Weight loss
Hyperactivity
Polyphagia
Lethargy
Excercise/cold intolerance
T4 level in blood
*
Low
Normal 0.8–4.7 μg/dL (10.0–60.0 nmol/L)
High >4.7– μg/dL (>60.0 nmol/L)
Is T4 in Gray Zone?
*
Yes 2.3–4.7 μg/dL (30.0–60.0 nmol/L)
No
< 2.3 μg/dL (30.0 nmol/L)
fT4
*
Low or Normal
High
Hypothyroidism likely
Hypothyroidism unlikely
Euthyroid sick or iatrogenic
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