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Related Concept Videos

Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies01:27

Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies

Assessing and diagnosing Chronic Obstructive Pulmonary Disease (COPD) involves a detailed approach that includes a comprehensive review of medical history, physical examination, and a variety of diagnostic tests. This thorough evaluation is essential to ensure an accurate diagnosis and guide effective management strategies.
Medical History
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...
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.
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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...
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Respiratory Assessment: Purpose and Indications

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Objectives and Importance:
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Related Experiment Video

Updated: Jun 3, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

Single time point diagnostic breath tests: a review.

Anil S Modak1

  • 1Cambridge Isotope Laboratories Inc., Andover, MA 01810, USA. anilm@isotope.com

Journal of Breath Research
|March 10, 2011
PubMed
Summary

Stable isotope-labeled xenobiotics enable rapid in vivo assessment of drug-metabolizing enzymes. New breath tests using [13C]-dextromethorphan, [13C]-pantoprazole, and [13C]-uracil offer quick, noninvasive evaluation for personalized medicine.

Area of Science:

  • Pharmacology
  • Biochemistry
  • Medical Diagnostics

Background:

  • Drug metabolism, particularly by Phase I enzymes, is crucial for therapeutic efficacy and safety.
  • Polymorphic enzymes like CYP2D6 and CYP2C19 significantly influence drug response.
  • Pyrimidine metabolism disorders can arise from deficiencies in enzymes like dihydropyrimidinase (DPD).

Purpose of the Study:

  • To develop and validate simple, noninvasive breath tests for assessing key drug-metabolizing enzyme activities.
  • To evaluate the potential of stable isotope-labeled compounds for rapid in vivo phenotyping.
  • To identify individuals with potential pyrimidine metabolic disorders.

Main Methods:

  • Utilized stable isotope-labeled [13C]-dextromethorphan and [13C]-pantoprazole for CYP2D6 and CYP2C19 phenotyping.

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  • Employed [13C]-uracil breath tests to assess dihydropyrimidinase (DPD), dihydropyrimidinase domain containing 1 (DPHD), and β-ureidopropionase activities.
  • Collected breath samples at a single time point for analysis.

    • Main Results:

    • Demonstrated the potential of [13C]-dextromethorphan and [13C]-pantoprazole breath tests for rapid CYP2D6 and CYP2C19 activity assessment.
    • Showcased the utility of the [13C]-uracil breath test for evaluating DPD, DPHD, and β-ureidopropionase enzyme function.
    • Confirmed the feasibility of these tests in a clinical or hospital setting with minimal patient burden.

    Conclusions:

    • These novel breath tests provide a rapid and noninvasive method for evaluating critical drug-metabolizing enzymes.
    • Enzyme activity assessment enables personalized medicine approaches, optimizing drug selection and dosage.
    • The [13C]-uracil breath test aids in the early identification of pyrimidine metabolic disorders.