Which of the following is NOT a standard diagnostic test used to help confirm Sjögren's syndrome?

A complete blood count is a general, nonspecific laboratory test that doesn't specifically aid Sjögren's syndrome diagnosis. The actual diagnostic workup for suspected Sjögren's syndrome includes SSA/SSB antibody testing, a labial minor salivary gland (lip) biopsy showing focal lymphocytic sialadenitis, salivary gland scintigraphy/stimulation testing, and objective measures of dry eyes (Schirmer's test) and dry mouth (sialometry).