Puchtler’s Modification of Bennhold’s Congo Red

  • Tech Only CPT
  • Tech Pro CPT
  • PowerPath Code
  • Schedule Monday - Friday
  • Turn Around Time Within 1-2 business days of receipt
  • Methodology Special Stains

Specimen Requirements

Formalin-fixed, paraffin embedded tissue block or cell block, or 1 unstained charged slide for each test requested plus 3-4 additional unstained slides cut at 8 microns. Adequate space on each slide for control tissue is required.

Diagnostic Utility

Congo red histology stain is used to stain amyloid. Green birefringence following Congo red staining is considered the most specific technique for demonstration of amyloid.