What is the role of lab tests in the workup of sudden visual loss?

Updated: Dec 11, 2019
  • Author: Jean Deschênes, MD, FRCSC; Chief Editor: Edsel Ing, MD, MPH, FRCSC  more...
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Laboratory studies should include a complete blood cell count, coagulation studies, renal function testing, fasting blood glucose study, and lipid testing.

The erythrocyte sedimentation rate, C-reactive protein level, and platelet count in patients older than 50 years with suspected GCA should be obtained.

In patients with suspected optic neuritis, exclude mimicking infections (eg, Lyme disease, cat scratch disease, syphilis, herpes zoster) and noninfectious causes (eg, sarcoidosis, systemic lupus erythematosus [SLE], and other vasculitides).

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