Esophageal String Test

What is an esophageal string test?

An esophageal string test (EST) is a simple, non-invasive diagnostic procedure used to detect acid reflux and other esophageal conditions. During the test, you swallow a thin, weighted string capsule that travels down your esophagus. The capsule collects samples of fluid from your esophageal lining, which are then analyzed in our laboratory to measure acid exposure and identify inflammation or other abnormalities.

This test is particularly useful for patients who may not tolerate traditional endoscopy (a camera-based procedure) or who need additional diagnostic information beyond what standard testing can provide.

Who is this service for?

The esophageal string test may be recommended if you experience:

• Chronic heartburn or acid reflux symptoms
• Persistent chest discomfort or pain when swallowing
• Suspected esophageal inflammation or damage
• Symptoms that don't respond well to standard reflux medications
• Need for objective measurement of acid exposure in your esophagus

Your specialist will assess whether EST is the right diagnostic tool for your specific situation.

What to expect during your visit

The esophageal string test is quick and straightforward. You'll be asked to swallow the small capsule attached to a thin string, which you'll hold gently between your teeth. The capsule travels naturally down your esophagus over the next 15 minutes while you rest comfortably. You may feel mild throat discomfort, similar to swallowing a large pill, but the procedure is generally well-tolerated.

After the collection period, the string is gently withdrawn, and the capsule is removed for laboratory analysis. Results typically become available within a few days, and your specialist will review them with you to discuss findings and next steps.

Treatment and management options

The esophageal string test itself is diagnostic only — it doesn't treat your condition. However, the information gathered helps your specialist develop a personalized management plan. Depending on your results, treatment may include:

• Lifestyle modifications such as dietary changes and positional adjustments
• Over-the-counter or prescription medications to reduce acid production
• Referral to gastroenterology if additional intervention is needed
• Monitoring and follow-up testing to track your progress

At Denver Allergy, we often see patients whose reflux symptoms overlap with allergic or asthmatic conditions, and we coordinate care to address all contributing factors.

Why choose Denver Allergy?

Our board-certified allergists and immunologists have extensive experience with diagnostic procedures like the esophageal string test. We serve patients throughout the Denver metro area, including Boulder, Lakewood, Westminster, Littleton, and Arvada. We prioritize your comfort, explain each step clearly, and work collaboratively to identify the root cause of your symptoms so you can feel better.

If you're experiencing persistent reflux symptoms or have been referred for esophageal testing, we're here to help. Contact us today to schedule your appointment and take the next step toward relief.

This page is for informational purposes only and does not constitute medical advice. Please consult a qualified healthcare professional before making any health decisions.