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Related Concept Videos

Serum Laboratory Studies, Stool Test, Breath Test01:30

Serum Laboratory Studies, Stool Test, Breath Test

Gastrointestinal (GI) diagnostic studies are pivotal in confirming, ruling out, diagnosing, or staging various diseases, including cancers. Following diagnosis, allocating time for discussions with the patient and providing informational resources is crucial. Diagnostic assessments of the GI tract often occur in outpatient settings like endoscopy suites or GI labs. Preparation for these tests may include dietary restrictions, fasting, liquid bowel preparations, laxatives, enemas, and the...
Assessment of Respiration01:23

Assessment of Respiration

The respiratory system's basic structures and primary functions lay the foundation for nurses' comprehensive respiratory assessments. This assessment includes subjective and objective data to gauge the patient's respiratory health.
Subjective Assessment: Nurses interview the patient to gather information directly during the subjective assessment. It includes questions about the individual's medical history, medications, and symptoms, focusing on past respiratory conditions like asthma or COPD,...
Physical Assessment of the Respiratory Tract II: Inspection01:27

Physical Assessment of the Respiratory Tract II: Inspection

Physical assessment of the respiratory tract through inspection is a crucial step in understanding the patient's respiratory health. It provides insights into the functioning of the respiratory system, the musculoskeletal structure, and even the patient's nutritional status. This comprehensive approach involves observing several vital aspects: chest configuration, breathing patterns, respiratory rates, skin color, and use of accessory muscles.
Chest Configuration
The chest configuration can...
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Pulmonary Function Tests01:25

Pulmonary Function Tests

Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...

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Related Experiment Video

Updated: May 30, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement
06:27

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Published on: June 11, 2014

How to interpret hydrogen breath tests.

Uday C Ghoshal1

  • 1Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India.

Journal of Neurogastroenterology and Motility
|August 24, 2011
PubMed
Summary

Hydrogen breath tests are increasingly used for diagnosing small intestinal bacterial overgrowth (SIBO) and sugar malabsorption. This review details techniques and interpretation for these non-invasive diagnostic methods.

Area of Science:

  • Gastroenterology
  • Diagnostic Medicine
  • Microbiology

Background:

  • Hydrogen breath tests (HBTs) are gaining popularity for diagnosing conditions like small intestinal bacterial overgrowth (SIBO) and sugar malabsorption.
  • While jejunal aspirate culture is the gold standard for SIBO, HBTs offer a non-invasive alternative despite lower sensitivity.
  • Various substrates (glucose, lactulose, lactose, fructose) are employed in HBTs.

Purpose of the Study:

  • To review the techniques and interpretation of different hydrogen breath tests.
  • To highlight the utility of HBTs in diagnosing SIBO and sugar malabsorption.
  • To compare the effectiveness of different HBT substrates and criteria.

Main Methods:

  • Review of literature on hydrogen breath tests for SIBO and sugar malabsorption.
Keywords:
Breath testsHydrogenIntestine, smallIrritable bowel syndrome

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  • Discussion of diagnostic criteria for lactulose and glucose hydrogen breath tests.
  • Outline of techniques for performing and interpreting HBTs.

    • Main Results:

    • Hydrogen breath tests are widely used for diagnosing SIBO and malabsorption of sugars like lactose and fructose.
    • The glucose hydrogen breath test is considered more reliable for SIBO diagnosis than the lactulose hydrogen breath test.
    • HBTs are valuable for identifying various types of sugar malabsorption.

    Conclusions:

    • Hydrogen breath tests are a practical, non-invasive tool for diagnosing SIBO and sugar malabsorption.
    • Careful consideration of test selection and interpretation is crucial for accurate diagnosis.
    • Further research may refine HBT sensitivity and specificity.