The Lightman SpO2 Sensor Tester

sensor LEDs are a major source of errors in pulse oximetry systems.

Clinical decisions depend on accurate input data. Yet sensor LEDs are a major source of errors in pulse oximetry systems. The problem is that a significant proportion of LED errors arise during the manufacturing process. In addition to this, LEDs are prone to ageing faults. But these problems are often masked by the pulse oximeter system itself. Result – every clinical decision is based on inaccurate data, patients’ health or lives are put at risk and users can’t give the best care.
Pulse oximetry works by shining light from two LEDs – one red, one infrared – through the blood. The absorption of these two wavelengths shows the degree of blood oxygen saturation, or SpO2. Any error in the wavelength emitted by the LEDs in the sensor will give an error in the SpO2 reading.
But wavelength error has a serious knock-on effect. A sensor error range of, for example, 2% at normal blood oxygen saturation of 97% can rise to 4% at 90%, 7% at 80%, and 9% at 70% saturation (see fig left), so it’s crucial to use the most accurate equipment possible. This can only be guaranteed by regular, frequent testing. The LIGHTMAN® SpO2 Sensor Tester is the most reliable way to do this, and it’s so quick and simple to use that sensors can be tested in seconds, on the spot, even by non-technical staff.