09/27/2025
⚠️ Negative Antigen Test? Don’t Rule It Out
Histoplasma or Blastomyces infections can still be present even when initial antigen tests come back negative—especially early in the disease or with localized lesions.
We recommend:
✔️ Testing both urine and serum
✔️ Adding antibody testing if antigen results are negative
✔️ Retesting after 1 month, if needed
✔️ Following up with cytology or histopathology when appropriate
🔬 Learn more: https://miravistavets.com/fungal-diseases/general-fungal/what-if-antigen-test-is-negative/