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Clinical Chemistry 40: 1757-1760, 1994;
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Clinical Chemistry, Vol 40, 1757-1760, Copyright © 1994 by American Association for Clinical Chemistry

Phospholipase A2, C-reactive protein, and white blood cell count in the diagnosis of acute appendicitis

JM Gronroos, JJ Forsstrom, K Irjala and TJ Nevalainen
Department of Surgery, University of Turku, Finland.

We compared the predictive value of determining group II phospholipase A2 (PLA2) in serum for diagnosing acute appendicitis with the predictive values of white blood cell count (WBC) and measurement of C- reactive protein (CRP). In this prospective study, we included 186 patients who were undergoing appendectomy after clinical diagnoses of acute appendicitis. The performance of each test was measured by receiver-operating characteristic curves. WBC was the test of choice in diagnosing uncomplicated acute appendicitis. However, in contrast to CRP and PLA2, which increased in patients with protracted inflammation, there was not a concomitant increase in WBC. Therefore, especially CRP, but also PLA2, were better indicators of appendiceal perforation or abscess formation than was WBC. Increased WBC, CRP, and PLA2 values did not unequivocally corroborate the clinical suspicion of appendicitis, but if all three values were within normal limits, acute appendicitis could be excluded with a 100% predictive value. PLA2 values showed a highly significant correlation with CRP but not with WBC values, which supports the view that PLA2 represents an acute-phase reactant.


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