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Table 1 Reference values for PO2, oxygen saturation and PCO2

From: Guidelines for diagnosis and management of congenital central hypoventilation syndrome

Measurement Reference values Comments
Oxygenation
 Arterial oxygenation (SpO2) ≥ 95% In room air / no supplemental O2
Ensure there is good detection of pulse waveforms to exclude movement artefacts or inadequate pulse detection
 Transcutaneous PO2 (TcPO2)
Arterial/Capillary PO2
80–100 mmHg
10.7–13.3 kPa
In-hospital use only
Change site of the heated probe according to manufacturer’s recommendations
Carbon Dioxide
Transcutaneous (TcPCO2)/ Arterial/Capillary PCO2 35–45 mmHg
4.7–6.0 kPa
Change site of the heated probe according to manufacturer’s recommendations
End-tidal CO2 (ETCO2) 30–40 mmHg
4.0–5.3 kPa
Measured at the nose or tracheostomy cannula
Technically difficult, requires end-tidal plateau