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Stockham and Scott > Thyroid interpretation > Flashcards

Thyroid interpretation Flashcards

1
Q

Dog:
tT4: WRI

A

Rules out hypothyroidism unless tT4 is falsely increased by T4AA

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2
Q 
Dog:
tT4: decreased
fT4: decreased 
TSH: increased
TgAA: positive
A

Primary hypothyroidism caused by lymphocytic thyroiditis

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3
Q 
Dog:
tT4: decreased
fT4: decreased
TSH: increased
TgAA: negative
A

Primary hypothyroidism caused by thyroid atrophy or possibly end-stage immune thyroiditis

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4
Q 
Dog:
tT4: decreased
fT4: decreased
TSH: WRI
TgAA: negative
A

Secondary hypothyroidism caused by pituitary gland dysfunction

Sick euthyroidism, nonthyroidal illness, hypothyroxemia caused by effects of drugs (TMS, prednisolone, phenobarbital)

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5
Q 
Dog:
tT4: decreased
fT4: WRI - increased
TSH: WRI - increased
TgAA: negative
A

nonthyroidal illness (sick euthyroidism)

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6
Q 
Dog:
tT4: WRI - increased
fT4: decreased
TSH: increased
TgAA: positive
A

Primary hypothyroidism (lymphocytic thyroiditis) with T4AA increasing tT4

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7
Q 
Dog:
tT4: WRI
fT4: WRI
TSH: WRI
TgAA: positive
A

Thyroiditis without thyroid dysfunction or false positive (e.g. nonspecific binding)

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8
Q 
Dog:
tT4: WRI
fT4: WRI
TSH: increased
TgAA: positive
A

Thyroiditis with compensatory increase in TSH production

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9
Q 
Dog:
tT4: WRI
fT4: WRI
TSH: increased
TgAA: negative
A

Potentially responding after withdrawal of suppressive drugs or after a nonthyroidal illness

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10
Q

Cat:
Clinical signs suggest: Hyperthyroidism
tT4: increased

A

Strong evidence of hyperthyroidism.

A concurrent increased fT4 provides additional evidence but is typically not needed

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11
Q

Cat:
Clinical signs suggest: Hyperthryoidism
tT4: decreased - WRI
fT4: WRI - increased

A

May be hyperthyroidism and/or nonthyroidal illness; T3 suppression test recommended

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12
Q

Cat:
Clinical signs suggest: WRI
tT4: WRI
fT4:

A

No evidence of thyroid dysfunction

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13
Q

Cat:
Clinical signs suggest: Euthyroidism
tT4: increased

A

Could be early hyperthyroidism, normal random variation, or inappropriate RI. Confirmatory increased tT4 or positive T3 suppression test is needed before diagnosing hyperthyroidism

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14
Q

Cat:
Clinical signs suggest: Euthyroidism
tT4: decreased

A

Probably nonthyroidal illness altering tT4 or fT4

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15
Q

Cat:
Clinical signs suggest: Euthyroidism
tT4: decreased to WRI
fT4: increased

A

Probably nonthyroidal illness altering tT4 or fT4

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16
Q

Cat:
Clinical signs suggest: Euthyroidism
tT4: decreased
fT4: WRI

A

Probably nonthyroidal illness altering tT4 or fT4

17
Q

Cat:
Clinical signs suggest: Hypothyroidism
tT4: decreased
fT4: WRI - increased

A

Nonthyroidal illness causing sick euthyroidism

18
Q

Cat:
Clinical signs suggest: Hypothyroidism
tT4: decreased
fT4: decreased

A

Probable primary hypothyroidism; could be secondary hypothyroidism or changes due to nonthyroidal illness or drug therapy

Stockham and Scott (9 decks)

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