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Welcome to EnteroTrack

EnteroTrack offers the Esophageal String Test (EST). The only non-endoscopic, office-based, and pain-free method to manage EoE.

The EnteroTracker

The EnteroTracker is used to perform the esophageal string test and aims to:

  • Provide a minimally invasive procedure that allows your doctor to collect samples from your esophagus.

  • Provide frequent monitoring of esophageal inflammation in Eosinophilic Esophagitis (EoE), reducing the need for repetitive invasive procedures.

  • Provide precise insights into disease progression, treatment responses, and management of (EoE).

Our easy four step process:

1

Secure

Secure
Wrap the proximal end of the pulled string around the patient’s finger once and instruct the patient to keep hold of the string.
2

Swallow

Swallow
Instruct the patient to swallow the capsule with water while keeping the string wrapped around their finger.
3

Relax

Relax
The string should remain in the patient’s upper GI tract for a period designated by the physician.
4

Retrieve

Retrieve
Pull the string out of the mouth at a slow, even rate. This should take no more than 5 seconds.
Empowering Healthcare Professionals & Patients

For EoE Patients

The esophageal string test is particularly valuable for patients with Eosinophilic Esophagitis who may need multiple procedures to:

  • Monitor disease activity
  • Assess response to treatment
  • Evaluate for food triggers
  • Reduce the need for repeated endoscopies

For Clinicians

The Esophageal String Test has demonstrated efficacy in monitoring eosinophilic esophagitis (EoE) and assessing the microbiome.

  • Acquire mucosal content samples that serve as a liquid biopsy, facilitating analysis for disease-related biomarkers at reference laboratories.
  • In-Office Monitoring of Eosinophilic Esophagitis
  • The EnteroTracker® is a device to be used for collection of fluid/mucus from the upper gastrointestinal tract of adult and pediatric patients.

Proudly Partnered With

UC BioengineeringChildren’s Hospital Colorado (CHCO)University of Colorado DenverAPFED (American Partnership for Eosinophilic Disorders)CURED Foundation
pH marker sample

EST Effectiveness in Monitoring EoE

Eosinophil counts and EoEScores significantly correlated during treatment, distinguishing patients with active EoE from treatment-associated remissions for 93.9% of ESTs performed.

Source: Ackerman SJ, Kagalwalla AF, Pan Z, et al. The minimally invasive 1-hour Esophageal String Test (EST) monitors therapeutic changes in mucosal inflammation in eosinophilic esophagitis. Am J Gastroenterol. Published online November 7, 2024. doi:10.14309/ajg.0000000000003192

What People Are Saying

"I recommend it."

Patient, Age 10

Patient, Age 10

"The string test results are just as effective as endoscopy"

EoE Clinician

EoE Clinician

"Kids can get back to being kids"

Children’s Hospital of Colorado

Children’s Hospital of Colorado

"I wanted to find something else besides scoping every 6 – 9 months. I would definitely recommend it over scoping"

Mother of EoE patient

Mother of EoE patient

"The String Test is excellent because it helps avoid anesthesia and sedation for patients. I think this is greatly going to change the care that patie..."

Dr. Khalaf, EoE Specialist, Univ. of South Florida

Dr. Khalaf, EoE Specialist, Univ. of South Florida

"I got to play on my phone for an hour. It was very easy"

Taylor, Age 9, North Carolina

"I love the String Test for the ease and cost effectiveness of it. It’s much less daunting than endoscopies and it makes treatment more manageable."

Ashlyn, Age 22, Colorado

"It's significantly more affordable and less invasive than an endoscopy"

Zach, Age 28, Colorado

"The string test was a much better experience than having an endoscopy. The procedure was easy, and not uncomfortable at all. We are so thankful that t..."

Lauren, Age 23, Virginia

"I recommend it."

Patient, Age 10

Patient, Age 10

"The string test results are just as effective as endoscopy"

EoE Clinician

EoE Clinician

"Kids can get back to being kids"

Children’s Hospital of Colorado

Children’s Hospital of Colorado

"I wanted to find something else besides scoping every 6 – 9 months. I would definitely recommend it over scoping"

Mother of EoE patient

Mother of EoE patient

"The String Test is excellent because it helps avoid anesthesia and sedation for patients. I think this is greatly going to change the care that patie..."

Dr. Khalaf, EoE Specialist, Univ. of South Florida

Dr. Khalaf, EoE Specialist, Univ. of South Florida

"I got to play on my phone for an hour. It was very easy"

Taylor, Age 9, North Carolina

"I love the String Test for the ease and cost effectiveness of it. It’s much less daunting than endoscopies and it makes treatment more manageable."

Ashlyn, Age 22, Colorado

"It's significantly more affordable and less invasive than an endoscopy"

Zach, Age 28, Colorado

"The string test was a much better experience than having an endoscopy. The procedure was easy, and not uncomfortable at all. We are so thankful that t..."

Lauren, Age 23, Virginia

Meet Jonah

Jonah smiling

“It was a huge relief for him. It ended this yearslong dietary restriction.”
– Josh, Jonah’s dad

As a young kid, Jonah did something no kid wants to do: skip pizza and ice cream. When he was 5 years old, he told his parents there was a “ball in his throat,” a sensation linked to eosinophilic esophagitis (EoE).

Patient talking to doctor

Find a Test Location Near You

Ask your doctor about EnteroTracker® and the Esophageal String Test® — a minimally invasive option for monitoring EoE and other conditions.

We’re helping patients across the U.S. access accurate testing through a growing network of trusted clinicians and hospitals.

Browse Locations

Featured Videos

Webinar with Dr. Ray Firszt - Tanner Clinic
Webinar with Dr. Ray Firszt - Tanner Clinic
The EnteroTracker
The EnteroTracker

Featured Articles

Understanding EoE: A Simple Overview

Learn what Eosinophilic Esophagitis is, how it’s diagnosed, and why early detection matters.

APFED/String Test Brochure

A minimally invasive prodecure that allows your doctor to collect samples from your esopahagus.

Eosinophilic Gastrointestinal Disease Explained

Learn from one of our partners, Cured, about the disease that effects many.

Questions? Let’s talk.

Whether you're a patient, provider, or partner — we’re here to help. Reach out to get more details or schedule a demo of the EnteroTracker.

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