Widow Spider Envenomation Workup

Updated: May 16, 2017
  • Author: Sean P Bush, MD, FACEP; Chief Editor: Joe Alcock, MD, MS  more...
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Workup

Laboratory Studies

If the diagnosis is uncertain, laboratory studies to rule out alternative diagnoses (eg, acute abdomen, myocardial infarction) (eg, CBC, pregnancy test, cardiac markers). [8]

The serum creatine kinase (CK) and peripheral white blood cell count may be elevated.

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Imaging Studies

Consider performing an acute abdominal series or an abdominal CT scan if the diagnosis is unclear in a patient presenting with abdominal pain.

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Other Tests

Skin testing variably may predict immediate hypersensitivity to antivenom and may influence the decision regarding its administration. Antivenom-induced anaphylaxis may be more life threatening than the envenomation itself.

Obtain an ECG, if indicated (eg, comorbidity, chest pain, severe hypertension).

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