Fast Five Quiz: Anal Fissures and Fistulas

Richard H. Sinert, DO


September 15, 2022

In patients with anal fissures that are irregular and/or off the midline, or in whom an underlying illness is present (eg, squamous cell cancer, Crohn's disease, AIDS), appropriate lab tests should be obtained. These can include:

  • Erythrocyte sedimentation rate

  • Biopsy of fissure or lesions (as warranted)

  • Stool and viral cultures

  • HIV testing

When ordinary anal fissures are located on the anterior or posterior midline, no laboratory tests are necessary.

Learn more about the workup of anal fissure.


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