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Nonin and Choice Oximeter Review - Low Perfusion

Under Construction

Nonin and Choice oximeter reivew: This is the forth in a series of articles in comparing the performance of oximeters made by Nonin and Choice. We used the four oximeters Onyx 9500, MD300C63, GO2, and MD300C1 to take measurements with the signal strength pushed down to the lowest possible settings (0.1%) supported by the BIOTEK Index SpO2 Simulator. The objective is to test these oximeters under the most extreme situations, including cases that are outside normal operating ranges and would rarely happen in real situations. Low signal strength corresponds to low blood perfusion.

Summary

All the oximeters performed very well when the pulse rate is at 90BPM and the signal strength is at or above 0.4%, which is already very low for a person. The normal range for a healthy individual should be around 5-6%. When the signal strength is set at 0.6%, the Choice oximeters failed to register a reading when the pulse rate is at 50BPM. A person with bradycardia and low blood perfusion would have problem with Choice oximeters.

In general, Nonin oximeters were slightly more sensitive and Onyx 9500 was able to give measurements throughout the entire range. In the entire test, the oximeters were able to give accurate or NULL readings. None of them showed a reading that was out of line.

SpO2 Measurements

To understand these numbers, please read Understanding Pulse Oximeter Accuracy. Slight variance (3% to 5%) among the readings for a given setting is normal.

The following table shows the SpO2 measurements obtained when the pulse strength decreases from 1% to 0.1%. Oxygen saturation and pulse rate are set to 90% and 95 BMP respectively. This setting corresponds to a normal pulse oximeter user. Weak pulse signal strength corresponds to people with poor blood perfusion or when the probe is not used properly.

BIOTEK Settings: SpO2 = 90%, Pulse Rate = 95 BPM
Pulse Strength Onyx 9500 MD300C63 GO2 MD300C1
1% 89% 91% 90% 91%
0.9% 89% 93% 90% 91%
0.8% 89% 93% 90% 92%
0.7% 89% 93% 90% 92%
0.6% 89% 91% 90% 91%
0.5% 89% 92% 90% 89%
0.4% 89% 90% 90% 88%
0.3% 88% - 90% 86%
0.2% 88% - 89% -
0.1% 89% - - -

We ran similar test with the pulse rate set at 180 BPM and obtained similar result.

The following table shows the SpO2 measurements obtained when the pulse strength is set at 0.6% and the pulse rate varies from 50BPM to 180BPM. decreases from 1% to 0.1%. Oxygen saturation and pulse rate are set to 90%.

BIOTEK Settings: SpO2 = 90%, Pulse Strength = 0.6%
Pulse Rate Onyx 9500 MD300C63 GO2 MD300C1
50 89% - 89% -
55 91% 91% 89% 89%
60 90% 87% 89% 89%
70 89% 88% 89% 91%
80 90% 88% 89% 90%
100 89% 91% 89% 90%
120 90% 90% 89% 91%
140 90% 91% 89% 92%
160 89% 91% 88% 92%
180 90% 93% 89% 91%

Pulse Rates

The pulse rates obtained during the entire experiment are all within their specified accuracy ranges. For simplicity, the table will not be shown here.

Pulse rate, ambient light and motion >>

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