14/08/2025
Measuring blood oxygen (also known as oxygen saturation, SpO₂) mainly relies on a pulse oximeter, which uses optical sensing technology to calculate oxygen saturation by detecting how blood absorbs light at specific wavelengths. Common devices include pulse oximeters, multi-parameter monitors, and smartwatches or fitness bands (with accuracy slightly lower than medical-grade devices).
Pulse oximeters are generally categorized into handheld and fingertip types.
The handheld type resembles a small patient monitor, equipped with a display and a probe (the probe connects to the main unit via a data cable). Advantages of this type include a wide measurement range, compatibility with different probes for fingers, earlobes, or forehead, and high accuracy, making it suitable for hospitals, clinics, as well as home use.
The fingertip pulse oximeter has a clip-like, all-in-one design that attaches directly to the finger. It is compact, portable, and easy to operate, making it ideal for home self-testing. However, this type has certain limitations—for example, it is only suitable for finger measurements, and it may be sensitive to low perfusion (poor blood flow) or movement, which could affect readings.
Different needs call for different choices, ensuring more accurate blood oxygen monitoring.
