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2-16 ApexPro™ 2001989-351A

Equipment Overview

 SpO2 = O2Hb + COHb + MetHb

 SaO2 = 100 x O2Hb /(100 - COHb - MetHb)

Where:

 SpO2 = Pulse oximeter determined and displayed oxygen saturation in percent

 O2Hb = Fractional oxyhemoglobin saturation in percent

 COHb = Carboxyhemoglobin saturation in percent

 MetHb = Methemoglobin saturation in percent

 SaO2 = Functional oxygen saturation in percent

The following table gives examples of the oximeter readings:

The mathematics are fixed in the pulse oximeter hardware and software. Thus, no

field calibrations are needed or are possible. There are no adjustable parts within the

pulse oximeter that affect the calibration.

The function f, depends on the wavelengths of the sensor LEDs. These wavelengths

are fixed by specified manufacturing processes and materials. The sensors are

checked for correct operation before shipping, so no adjustment or calibration is

needed or possible.

Because the pulse oximeter does all critical computations in software and there are no

critical parts to drift; no re-calibration is needed.

Interconnection cables

NOTE

Refer to the ApexPro Telemetry System or CARESCAPE Telemetry T14

transmitter Operator’s Manual for further details on interconnection cables.

Apex oximeter and Accutracker DX

The interconnection cable used to connect the transmitter with the Apex Oximeter

and/or the Accutracker DX blood pressure monitor, and/or the DinaLink serial cable.

Example 1 Example 2

O2Hb = 96 O2Hb = 88

COHb = 0.5 COHb = 8

MetHb = 0.6 MetHb = 2

SpO2 = 97 SpO2 = 98

SaO2 = 97.07 SaO2 = 97.78

GE ApexPro Technical Manual

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