---
title: "Horsefly I204 IgE Test: What It Measures & What Results Mean"
description: "It measures IgE sensitization to horsefly allergen I204 and helps guide allergy next steps, with easy ordering through Vitals Vault and Quest labs."
canonical: "https://www.vitalsvault.com/biomarkers/horsefly-i204-ige"
last-updated: 2026-08-22
---

# Horsefly I204 IgE Test: What It Measures & What Results Mean

> It measures IgE sensitization to horsefly allergen I204 and helps guide allergy next steps, with easy ordering through Vitals Vault and Quest labs.

---

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