Widow Spider Envenomation Workup

Updated: Sep 19, 2018
  • Author: Sean P Bush, MD, FACEP; Chief Editor: Joe Alcock, MD, MS  more...
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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.


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.


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).