Infections & SerologyNo Fasting RequiredTurnaround: 4–8 hours (same day)

H. Pylori (Helicobacter Pylori — Stool Antigen & Breath Test)

Also known as: Helicobacter Pylori Antigen, H. Pylori Stool Test, Urea Breath Test (UBT), Gastritis & Ulcer Test, HpSA

Parameters Measured in the Report

A breakdown of individual biomarkers and biological reference intervals typically found in your report:

Biomarker	Standard Range	Unit	What It Means
H. Pylori Stool Antigen (HpSA) (Stool Antigen)	Negative / Non-Reactive	qualitative	EIA/immunochromatographic detection of active living H. pylori bacteria colonizing gastric mucosa.
14C / 13C Urea Breath Test (UBT Value)	Negative (< 50 DPM / DOB < 2.5)	isotopic ratio	Measures urease enzyme activity breaking down ingested urea into isotopic carbon dioxide exhaled in breath.

* Note: Reference ranges may vary slightly between testing instruments and reagent kits. Always refer to the reference interval printed on your specific pathology report.

Clinical Focus

Qualitative detection of Helicobacter pylori outer membrane bacterial antigens shed in stool, or 13C/14C isotopic CO2 in exhaled breath.

Sample & Specimen

Fresh stool specimen or breath collection after drinking urea solution

Fasting Protocol

No fasting required for stool test (fasting 4–6 hrs for breath test). Stop PPIs 2 weeks prior.

Turnaround Time

4–8 hours (same day)

What Is This Test?

Helicobacter pylori (H. pylori) is a spiral-shaped, microaerophilic gram-negative bacterium that colonizes the human gastric mucosal lining. To survive in the harsh, highly acidic environment of the stomach, H. pylori produces massive quantities of the enzyme urease, which converts gastric urea into neutralizing ammonia. Infection with H. pylori is the **primary underlying cause of chronic gastritis, gastric ulcers, duodenal ulcers, and gastric adenocarcinoma**. Modern clinical guidelines recommend direct active-infection testing — either the **H. Pylori Stool Antigen (HpSA)** or the **13C/14C Urea Breath Test** — because they confirm active living bacteria, unlike outdated blood antibody tests that remain positive for years after cure.

Why Did Your Doctor Order This Test?

Physicians routinely prescribe the H. Pylori Test in the following clinical scenarios:

Chronic dyspepsia: persistent burning epigastric pain, postprandial fullness, early satiety, chronic bloating, or nausea

Definitive diagnosis and management of Peptic Ulcer Disease (gastric ulcers and duodenal ulcers)

Evaluation of unexplained iron-deficiency anemia or Vitamin B12 deficiency refractory to oral supplementation

Confirmation of bacterial eradication at least 4 to 6 weeks after completing H. pylori triple or quadruple therapy

Gastric MALT lymphoma staging or strong family history of gastric adenocarcinoma

How to Prepare Before Your Test

Fasting Requirement: No fasting required for stool test (fasting 4–6 hrs for breath test). Stop PPIs 2 weeks prior.

You must STOP taking Proton Pump Inhibitors (PPIs such as omeprazole, pantoprazole, esomeprazole) for at least 2 weeks prior to testing.
You must STOP taking antibiotics and bismuth subsalicylate for at least 4 weeks prior to testing.
Failure to pause acid reducers suppresses bacterial shedding, causing false-negative test results.

Understanding Your Results

What higher or lower readings generally mean in clinical practice:

If Values Are Higher Than Normal

A Positive H. Pylori Stool Antigen or Positive Urea Breath Test confirms active gastric bacterial colonization, requiring a 14-day course of combination eradication therapy (bismuth quadruple therapy or clarithromycin triple therapy plus high-dose PPI). Successful eradication eliminates ulcer recurrence.

If Values Are Lower Than Normal

A Negative result confirms the absence of active H. pylori colonization, indicating that dyspeptic symptoms or ulcers stem from non-bacterial causes (such as NSAID/aspirin overuse, bile reflux, or functional dyspepsia).

Frequently Asked Questions

Why does my doctor prefer a stool test or breath test over an H. pylori blood test?

Blood tests detect IgG antibodies that remain in your bloodstream for years or decades even after H. pylori is completely cured. Stool antigen and urea breath tests only detect living bacteria currently active inside your stomach.

Why do I have to stop my antacid/PPI medication for 2 weeks before testing?

Proton pump inhibitors (like pantoprazole or omeprazole) suppress H. pylori bacteria, causing them to temporarily hide in mucosal folds. This causes a false-negative test result even when bacteria are still present.

Related Laboratory Tests

Tests frequently prescribed together or used as follow-up investigations:

Stool Routine & Occult Blood Examination (FOBT / R/M)

Microscopic presence of hidden (occult) hemoglobin, intestinal pus cells, red blood cells, ova, cysts, and parasites.

Complete Blood Count (CBC / Hemogram)

Counts and evaluates red blood cells, white blood cells, hemoglobin, hematocrit, and platelets.

Iron Profile & Serum Ferritin

Serum Iron, Total Iron-Binding Capacity (TIBC), Transferrin Saturation (% Sat), and Stored Tissue Ferritin.

Medical & Diagnostic Disclaimer

This guide is published for educational and patient informational purposes only. It is not a substitute for professional medical evaluation, diagnosis, or clinical advice.

A laboratory result that falls slightly outside standard statistical reference intervals does not automatically indicate disease; conversely, a normal result does not guarantee the absence of medical conditions. Only your attending physician can interpret lab findings in the context of your medical history, physical exam, and symptoms.