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Spiders: Diagnostic Studies

Latrodectus

Laboratory data are not helpful in diagnosing or managing patients who have been bitten by a black widow spider. There is no specific laboratory assay to definitively diagnose a black widow spider bite. The most common laboratory findings are leukocytosis and increased creatine phosphokinase and lactate dehydrogenase concentrations.29

Loxosceles

Definitive diagnosis is possible only when the spider that inflicted the bite is positively identified. There are no diagnostic tests commercially available for brown recluse envenomations. Basic laboratories may reveal hemolysis, hemoglobinuria, hematuria, coagulopathy, and abnormal liver and renal function and will aid the clinician in the management of these complications.

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Last Modified: 08/17/2017
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