The Gold Standard of
Hypersensitivity Testing

Exclusive providers of high sensitivity Lymphocyte Response Assay by ELISA/ACT™ (hsLRA™) tests.

Learn More

Why LRA?

LRA tests are documented to help people heal and be resilient under stress. LRA by ELISA/ACT, CLIA certified since 1984, provides the most accurate, helpful, comprehensive delayed ‘hidden’ allergy ex-vivo cell cultures. Russell M. Jaffe, MD, Ph.D., CCN, NACB (DrJ) developed the patented LRA tests, enabling thousands of physicians to quickly and precisely determine the hidden causes of many chronic conditions and help their patients find sustained relief. By looking directly at lymphocytes, the LRA detects all 3 types of delayed food and chemical hypersensitivities to as many as 509 items.  – Your Immune Defense and Repair System’s Critical Role – Autoimmune Self-Attacking Conditions – Who Benefits – Personal Clinical Successes – Quality Control Matters

Open Account Learn More About LRA

What Are Predictive Biomarkers?

These 8 tests measure the major causes of suffering and early death. 

When compared to healthy goal values, results of these eight independent, primary, predictive tests are effective forecasters of individual health risk or resilience.

Patients can function years – or even decades – younger than their birth age just by bringing (or keeping) each of these biomarkers at their predictive (healthy) goal value.

Free Virtual Workshop


See what our customers are saying

“In the past decade of my practice, I have been using the elimination/provocation test, when appropriate, combined with the LRA by ELISA/ACT… In my opinion and experience, this is the state-of-the-art in food sensitivity detection.”


Toronto, Ontario, Canada

“From fibromyalgia, chronic fatigue, or chronic yeast infections, to IBS, IBD, or eczema the LRA by ELISA/ACT tests can be invaluable in formulating a comprehensive therapeutic program to reverse these debilitating maladies. Not only do the tests alert the patient to those items they are reacting to and causing symptoms, the lab also provides nutritional and behavioral recommendations to help the body recover from its repair deficit. I am pleased that I can offer such powerful and effective tests to my patients.”


Ashburn and Fredericksburg, VA

“I have worked with EAB for more than 10 years and have found the LRA by ELISA/ACT tests to be the most reliable and effective solution to solving my patients’ chronic health conditions.”

Norm Schwartz, MD

Milwaukee, WI

“I’m amazed with the results I’ve seen with my asthma patients. Of the asthma patients that have taken the LRA by ELISA/ACT tests, I would say 75% no longer rely on medication. In most cases, these are people who have been dependent on asthma medications for many years. We have achieved a very high success rate by simply identifying delayed sensitivities and avoiding reactive items.”


East Stroudsburg, PA

“LRA by ELISA/ACT tests are relatively new to our practice, and yet in a short period of time, we have seen immediate results. The tests are very individualized and precise, and the results are very usable, which allows the patient to see a positive outcome quickly.”


Toms River, NJ

“Over the years my patients have said, ‘LRA by ELISA/ACT tests have really helped me.’ The tests have made a big difference in my practice by being the missing link to improve chronic conditions.”


Charleston, WV

PERQUE Integrative Health (PIH) Academy educates healthcare practitioners in the philosophy and practice of Physiology First as the basis of functional medicine – focusing on the processes and functions that create, sustain, and optimize life. It is an approach that looks at how the things we eat, drink, think and do impact us physiologically – either supporting or detracting from optimal function. Physiology First (before pharmacology) is at the core of proactive prevention and the practice of functional medicine.

PIH Academy Course 5 is now open for enrollment. Click the button below to learn more.

View Latest Course

Thriving In The 21st Century is Now Available

Russell Jaffe, MD, PH.D., CCN

This book is a guide to reconnecting and rediscovering your healing capacities by embracing a nature, nurture, and wholeness approach to life.
Order Now