acid reflux urine test explained

Overview

An acid reflux urine test looks for a protein called pepsin in your urine. Pepsin is an enzyme (a helper protein) that is normally only found in your stomach. If it shows up in your urine, it may be a sign that stomach contents, including acid, are traveling back up into your throat and mouth (which is acid reflux). This test offers a simple, non-invasive way to help check for reflux without needing a tube down your throat.

The urine test for acid reflux is relatively new and not widely used in all countries. However, acid reflux itself is very common — about 1 in 5 adults in the UK have frequent heartburn or reflux symptoms.

Acid reflux can affect anyone, but it is more common in adults over 40, people who are overweight, smokers, and pregnant women. The urine test may be offered to people with persistent reflux symptoms to help guide diagnosis.

Symptoms

Common symptoms

• A burning feeling in your chest (heartburn), often after eating or at night
• Regurgitation (a sour or bitter taste in your mouth from stomach fluid)
• Chest pain or discomfort, especially when lying down
• Trouble swallowing or a feeling of a lump in your throat
• Chronic cough, hoarseness, or sore throat

Symptoms in children

• Frequent spitting up or vomiting, especially after feeding
• Irritability or crying during or after meals
• Poor feeding or refusing food
• Wheezing or persistent cough
• Ear infections or sinus problems

Symptoms in older adults

• Less typical heartburn, but more often coughing, hoarseness, or a feeling of fullness in the chest
• Difficulty swallowing (dysphagia), which can lead to food getting stuck
• Unexplained weight loss or loss of appetite
• Chest pain that may be mistaken for heart trouble

Causes

Main causes

• A weak or relaxed lower esophageal sphincter (the muscle at the bottom of your food pipe that normally closes after food passes through)
• Hiatal hernia (when part of your stomach pushes up through your diaphragm into your chest)
• Pregnancy (hormones and pressure from the growing baby)
• Excess weight or obesity (increases abdominal pressure)
• Certain foods and drinks that can relax the sphincter or increase stomach acid

Risk factors

• Being overweight or obese
• Smoking or tobacco use
• Pregnancy
• Eating large meals or eating late at night
• Consuming foods such as fatty or fried foods, chocolate, caffeine, alcohol, citrus, tomatoes, spicy foods, or peppermint
• Certain medications, including some for asthma, high blood pressure, or pain relief (talk to your doctor about any concerns)
• Having a hiatal hernia

When to see a doctor

See a doctor urgently if:

• If you have severe chest pain, especially with shortness of breath, pain in your arm or jaw – call your local emergency number immediately.
• If you are vomiting blood or have black stools – seek urgent medical attention.
• If you are unable to swallow or have severe pain when swallowing.

Book a routine appointment if:

• If you have heartburn or regurgitation that happens twice a week or more
• If over-the-counter antacids are not helping or you need them more than recommended
• If you have a chronic cough, hoarseness, or asthma-like symptoms that may be linked to reflux
• If you have difficulty swallowing that is not improving

Diagnosis

A diagnosis of acid reflux is usually based on your symptoms and may be confirmed with tests. The urine pepsin test is one option. Your doctor will also ask about your medical history and may refer you to a gastroenterologist (a doctor who specialises in digestion).

Tests that may be done

• Urine pepsin test – you collect a urine sample (often first morning urine) and send it to a lab; results usually come back in a few days.
• Endoscopy – a thin, flexible tube with a camera is passed down your throat to look at your oesophagus and stomach. You may be given a sedative to relax.
• pH monitoring – a thin tube is placed in your oesophagus for 24 hours to measure how much acid comes up from your stomach.
• Barium swallow – you drink a chalky liquid that shows up on X-rays, and X-ray pictures are taken to see if stomach material is backing up.

What to expect at your appointment

If your doctor recommends a urine pepsin test, they will give you a collection kit with instructions. You will typically collect a sample first thing in the morning, before eating or drinking. The sample is sent to a laboratory. The test is painless and can be done at home. Other tests like endoscopy or pH monitoring might be done in a clinic or hospital. Your doctor will explain which test is best for you.

Treatment

Treatment for acid reflux aims to reduce symptoms, heal any damage to the oesophagus, and prevent complications. Most people can manage their symptoms with lifestyle changes and medication. The urine test may help your doctor decide the best treatment plan.

Self-care at home

• Eat smaller, more frequent meals instead of large meals
• Avoid trigger foods such as spicy, fatty, or acidic foods, and limit caffeine, alcohol, and chocolate
• Do not lie down for at least 2–3 hours after eating
• Raise the head of your bed by 15–20 cm (using blocks or a wedge pillow) so gravity helps keep acid down
• Maintain a healthy weight – losing even a small amount can help
• Stop smoking if you smoke
• Wear loose clothing around your waist

Medical treatments

Your doctor may recommend medicines that help reduce stomach acid or strengthen the muscle at the bottom of the oesophagus. Common types include antacids to neutralise acid, H2 blockers that reduce acid production, and proton pump inhibitors that powerfully reduce acid. Some medicines help the stomach empty faster. Always take medications as prescribed and discuss any side effects with your doctor. Do not stop or change your medication without speaking to a healthcare professional.

When is surgery considered?

Surgery, called anti-reflux surgery or fundoplication, is rarely needed. It may be considered if medications do not work well, you have a hiatal hernia causing trouble, or you prefer to avoid long-term medication. The operation wraps part of the stomach around the lower oesophagus to strengthen the valve. Discuss the risks and benefits with a specialist.

Living with this condition

Living with acid reflux often means making some adjustments to your daily routine, but most people manage very well. Simple changes like eating earlier in the evening and keeping a food diary to identify your triggers can make a big difference. The urine test can give you a better understanding of whether reflux is actually the cause of your symptoms.

Lifestyle tips

• Keep a diary of what you eat, your symptoms, and what makes them better or worse
• Elevate the head of your bed—avoid using extra pillows which can increase pressure on your stomach
• Chew food slowly and thoroughly
• Try to eat at least 2–3 hours before bedtime
• Manage stress—stress can worsen reflux, so try relaxation techniques like deep breathing or gentle exercise
• Sleep on your left side—this position can reduce acid reflux

Diet and exercise

A balanced diet is important. Focus on vegetables, fruits, lean proteins, and whole grains. Limit fatty, fried, or spicy foods, as well as citrus, tomatoes, and carbonated drinks. Moderate exercise, such as walking or swimming, can help with weight management and reduce symptoms. However, avoid vigorous exercise right after eating. If you are active, drink water and listen to your body.

Mental health and emotional wellbeing

Chronic acid reflux can be frustrating and may cause anxiety, especially about eating or sleeping. It can also affect your quality of life. It is normal to feel worried, but remember that reflux is treatable. If symptoms are making you feel anxious or down, talk to your doctor. They can suggest resources or refer you to a counsellor if needed.

Prevention

You cannot always prevent acid reflux, but you can reduce your risk by maintaining a healthy weight, avoiding trigger foods, not smoking, and managing stress. Making good habits around eating times and meal sizes also helps. If you have a hiatal hernia, you may still experience reflux, but lifestyle changes can lessen symptoms.

Screening programmes

There is no routine screening test for acid reflux. However, if you have frequent, ongoing symptoms, your doctor may recommend the urine pepsin test or other tests to help diagnose reflux early and prevent complications.

Complications

If left untreated

• Oesophagitis (inflammation of the oesophagus) that can cause pain and bleeding
• Barrett’s oesophagus (changes in the lining of the oesophagus that slightly increase the risk of oesophageal cancer)
• Strictures (narrowing of the oesophagus from scar tissue, causing difficulty swallowing)
• Chronic cough, laryngitis, or asthma worsening
• Tooth erosion from repeated exposure to stomach acid

Long-term outlook

For the vast majority of people, acid reflux can be well controlled with lifestyle changes and medication. Even if you have a more severe form, treatments are very effective. Serious complications like Barrett’s oesophagus are rare and can be monitored. With proper care, you can lead a full, comfortable life.

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