Diagnostic Testing
Comprehensive food sensitivity panels, allergy testing, and combo panels to inform your nutrition and protocol decisions. Serving Lisle, Naperville & Chicago’s western suburbs.
Book an AppointmentWhat Is Diagnostic Testing at Defiant?
Defiant offers a focused set of diagnostic panels designed to inform nutrition and protocol decisions: IgG-based food sensitivity testing, IgE-based allergy testing, and a combination panel that covers both. Each is a blood-based test. We can write the order and review your results; the draw itself is done through your PCP or Rythm Health. Results return in 1 to 2 weeks.
- + Inform weight loss and peptide protocols
- + Starting point for elimination diets
- + Identify classic environmental allergens
- + Comprehensive results in 1 to 2 weeks
- + Provider walkthrough of results included
How Our Diagnostic Panels Work
Food Sensitivity Panel (IgG)
A broad IgG panel covering common foods. Honest framing: IgG testing is debated in the literature, so we use it as a starting point for elimination work, not as a diagnosis. Best for low-grade chronic symptoms.
Allergy Test (IgE)
The classic IgE allergy test. Measures the immune pathway behind hives, swelling, hay fever, and acute allergic reactions. Well-established methodology with clear clinical use.
Combo Panel (IgG + IgE)
Both IgG and IgE in a single draw. Useful when you suspect a mix of classic allergies and lower-grade food triggers, or as the broadest starting point before a weight loss or peptide protocol.
Blood Draw & Lab
We write the order, you complete the draw through your PCP or Rythm Health. Results return in 1 to 2 weeks and we walk through them with you to plan elimination, reintroduction, or referral.
What Diagnostic Testing Can Support
These panels matter most when they change a decision. Done in isolation, a panel is just a list of foods. Done in the context of a weight loss, peptide, or recovery protocol, the same panel can shape your nutrition plan and the cadence of follow-up. Common use cases:
- + Inform nutrition before a weight loss protocol
- + Starting point for elimination and reintroduction work
- + Identify environmental allergens behind chronic symptoms
- + Inform peptide protocol design
- + Reduce chronic inflammatory load on the gut
- + Document baseline before bigger nutrition changes
Considering testing? Bring your symptom list and goals to your appointment. We’ll recommend the panel that fits, and skip the ones that don’t.
Diagnostic panels at Defiant are informational. They are not a substitute for medical diagnosis or allergy management by a board-certified specialist.
Diagnostic Panels
Blood-based panels. Draw completed through your PCP or Rythm Health. Results in 1 to 2 weeks.
Identifies foods that may be causing chronic discomfort like bloating, headaches, fatigue, or digestive issues. Measures your immune response to 250 common foods.
Book an AppointmentThe full picture. Combines the Food Sensitivity and Allergy panels into one comprehensive report covering both foods and environmental triggers in a single draw.
Book an AppointmentPinpoints environmental and seasonal allergens behind sneezing, congestion, itchy eyes, and sinus issues. Pollen, pet dander, mold, and more.
Book an AppointmentCommon Questions
Everything you need to know about food sensitivity, allergy, and combo diagnostic panels at Defiant in Lisle, IL, serving Naperville and Chicago’s western suburbs.
Data Before Decisions
Bring your symptom list and your goals. We’ll match the panel to what you’re actually trying to learn. Diagnostic testing at Defiant in Lisle, IL.