Total T4 (Canine)

Also known as:ThyroxineTT4

Reference Range

Critical Low

<0.5

ug/dL

Reference Range

1-4

ug/dL

Optimal Range

1.5-3.5

ug/dL

Critical High

ug/dL

Also reported in: nmol/L

Thyroxine (T4) regulates metabolism. Normal levels mean your dog's thyroid is producing enough hormone.

Low

Hypothyroidism is common in dogs (especially Golden Retrievers, Dobermans). It causes weight gain, lethargy, and hair loss.

What to do:

Your vet will likely recommend a Free T4 and TSH panel to confirm, followed by daily thyroid supplementation.

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Normal

Thyroxine (T4) regulates metabolism. Normal levels mean your dog's thyroid is producing enough hormone.

What to do:

No action needed.

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High

High T4 is very rare in dogs and usually linked to thyroid tumors or over-supplementation of thyroid meds.

What to do:

Consult your vet immediately.

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