Diagnostic efficacy of elevated serum angiotensin-converting enzyme and lymphopenia between presumed sarcoid uveitis and presumed tubercular uveitis.

PURPOSE: To evaluate the diagnostic efficacy of elevated serum angiotensin-converting enzyme (sACE) and lymphopenia in presumed sarcoid and tubercular uveitis. METHODS: A single-centre retrospective study was conducted on a cohort of 755 adult patients with uveitis between January 2019 and June 2020. Demographic, clinical and laboratory data were retrieved from our hospital database. Measurements of serum angiotensin-converting enzyme (sACE) and lymphocyte counts were analysed. RESULTS: The mean age of the patients was 41 ± 13 years. Presumed sarcoid uveitis was diagnosed in 50 (7%) patients, presumed tubercular uveitis in 222 (29.4%) and other uveitic entities noted in 483 (64%). Intermediate and posterior uveitis were the most common anatomical diagnosis in presumed sarcoid uveitis (59% and 20%, respectively) and in presumed tubercular uveitis (46% and 38%, respectively). Elevated sACE was noted in 76% of presumed sarcoid uveitis and 46% in presumed tubercular uveitis. The combination of high serum angiotensin-converting enzyme along with lymphopenia was only in 17% in presumed sarcoid uveitis and 9.7% in presumed tubercular uveitis. sACE was found to be a significant risk factor for presumed sarcoid uveitis with an odds ratio of 3.603 (p < 0.002), and in presumed tubercular uveitis odds ratio was not significant with odds ratio of 1.19. Lymphopenia was not found to be a significant factor in both groups. CONCLUSION: Elevated sACE activity was an independent risk factor for presumed sarcoid uveitis over lymphopenia alone or in combination with lymphopenia.