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Related Concept Videos

Pulse Oximetry01:24

Pulse Oximetry

1.6K
Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
1.6K
Guidelines For Measuring Vital Signs01:19

Guidelines For Measuring Vital Signs

3.2K
Following these guidelines can help nurses accurately measure vital signs, assess changes in patient conditions, and provide timely treatment when necessary. Adhering closely to the guidelines ensures the accuracy and reliability of the results.
Before taking a patient's vital signs, a nurse would consider and assess the patient's comfort level and ensure appropriate equipment is available.
3.2K
Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

1.1K
Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is...
1.1K
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

2.0K
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...
2.0K
Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

8.1K
Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
8.1K
Hypoxia01:23

Hypoxia

2.5K
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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Related Experiment Video

Updated: Mar 21, 2026

Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
08:58

Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence

Published on: May 4, 2011

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Pulse oximetry optical sensor using oxygen-bound haemoglobin.

Z J V Cohen, S Haxha, A Aggoun

    Optics Express
    |May 4, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel, low-cost sensor for measuring blood oxygen saturation (SpO2) by analyzing hemoglobin

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    Area of Science:

    • Biomedical Engineering
    • Optical Sensing
    • Medical Diagnostics

    Background:

    • Conventional pulse oximetry relies on absorption differences between oxygenated and deoxygenated hemoglobin.
    • Existing methods may have limitations in cost or robustness for certain applications.

    Purpose of the Study:

    • To develop and validate a novel, low-cost sensor for measuring oxygen saturation (SpO2).
    • To utilize the unique spectral properties (wavelength) of hemoglobin for SpO2 determination.

    Main Methods:

    • Experimental setup using a spectrometer to measure hemoglobin wavelength at varying oxygen saturation levels.
    • Design and implementation of a prototype sensor incorporating a color sensor for SpO2 measurement.
    • Correlation analysis between measured hemoglobin wavelength and blood oxygen saturation.

    Main Results:

    • Demonstrated a relationship between the wavelength of oxygen-bound hemoglobin and SpO2 levels.
    • Developed a robust, low-cost wavelength-monitoring SpO2 sensor.
    • The sensor utilizes blood color, not absorption differences, for SpO2 measurement.

    Conclusions:

    • The proposed wavelength-based approach offers a unique and effective method for SpO2 monitoring.
    • The developed sensor is a cost-effective and robust alternative for measuring blood oxygen saturation.
    • This technology has potential applications in non-invasive medical diagnostics.