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Related Concept Videos

Pulmonary Function Tests01:25

Pulmonary Function Tests

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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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External and Internal Respiration01:24

External and Internal Respiration

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External respiration occurs in the lungs, and it is the first step in the journey of oxygen inside the body. When we inhale, oxygen enters our lungs and diffuses across the thin alveolar membrane. The alveoli are tiny, air-filled sacs that provide a vast surface area for gas exchange. Oxygen in the alveoli has a higher partial pressure (105 mmHg) than in the adjacent pulmonary capillaries (40 mmHg), establishing a pressure gradient. As a result, oxygen molecules move from the alveoli into the...
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Lung Capacity01:47

Lung Capacity

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
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Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

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Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies01:27

Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies

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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
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Factors Affecting Respiration01:24

Factors Affecting Respiration

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Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
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Related Experiment Video

Updated: Nov 4, 2025

Author Spotlight: Integrating Alveolar-Capillary Reserve Measurements in Exercise Adaptation and Therapeutic Strategies
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The associations between red cell distribution width and lung function measures in a general population.

Jingxue Pan1, Suneela Zaigham1, Margaretha Persson1

  • 1Department of Clinical Sciences in Malmö, Lund University, Malmö, Sweden.

Respiratory Medicine
|May 27, 2021
PubMed
Summary

High red cell distribution width (RDW) shows inverse associations with lung function measures like FEV1 and FVC. However, RDW is unlikely to be a sensitive marker for impaired lung function in the general population.

Keywords:
Diffusing capacityGeneral populationImpulse oscillometryLung function measuresRed cell distribution widthSpirometry

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Area of Science:

  • Pulmonary Medicine
  • Hematology
  • Biomarkers

Background:

  • Red cell distribution width (RDW) indicates erythrocyte volume heterogeneity.
  • Elevated RDW is a recognized risk marker for cardiovascular and respiratory diseases.
  • The relationship between RDW and lung function in the general population is not well-established.

Purpose of the Study:

  • To investigate the association between RDW and lung function parameters.
  • To explore relationships with spirometry, diffusing capacity (DLCO), and impulse oscillometry (IOS).

Main Methods:

  • Analysis of data from 5767-5598 participants (aged 50-64) in the Swedish CArdioPulmonary bioImage Study (SCAPIS).
  • Utilized multiple linear regression and general linear models.
  • Adjusted for potential confounding factors.

Main Results:

  • Significant inverse associations were found between RDW and FEV1, FVC, and FEV1/FVC.
  • RDW was associated with diffusing capacity (DLCO) only in smokers.
  • Pulmonary reactance (X5) from IOS showed a significant inverse association with RDW.

Conclusions:

  • Significant negative associations exist between RDW and lung function measures.
  • The observed effect sizes are small, suggesting RDW is not a sensitive marker for lung function impairment in middle-aged adults.