What is the gold standard for diagnosis of giant cell arteritis?

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Multiple Choice

What is the gold standard for diagnosis of giant cell arteritis?

Temporal artery biopsy provides definitive confirmation of giant cell arteritis because histology shows granulomatous inflammation with multinucleated giant cells, along with changes like disruption of the elastic lamina and intimal hyperplasia. This direct visualization of vasculitis in the arterial wall is why it’s the gold standard, unlike ESR or CRP, which are nonspecific, or imaging tests that can support but not confirm the diagnosis. Keep in mind that GCA can affect only segments of the artery, so a biopsy can miss disease (a false negative), and a negative result doesn’t completely exclude it if clinical suspicion remains high. In practice, clinicians may start high-dose steroids promptly to protect vision while biopsy results are pending, but the biopsy is what ultimately confirms the diagnosis.

Temporal artery biopsy provides definitive confirmation of giant cell arteritis because histology shows granulomatous inflammation with multinucleated giant cells, along with changes like disruption of the elastic lamina and intimal hyperplasia. This direct visualization of vasculitis in the arterial wall is why it’s the gold standard, unlike ESR or CRP, which are nonspecific, or imaging tests that can support but not confirm the diagnosis. Keep in mind that GCA can affect only segments of the artery, so a biopsy can miss disease (a false negative), and a negative result doesn’t completely exclude it if clinical suspicion remains high. In practice, clinicians may start high-dose steroids promptly to protect vision while biopsy results are pending, but the biopsy is what ultimately confirms the diagnosis.

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