Acid–base / gases — paediatric reference ranges
5 reference ranges. Values vary by laboratory, assay and age — always check the range printed on your own report.
| Test | Specimen | Reference range |
|---|---|---|
| pH (arterial) | Blood gas | 7.35–7.45 |
| PaCO₂ | Blood gas | 35–45 mmHg (4.7–6.0 kPa) |
| PaO₂ | Blood gas | 80–100 mmHg (10.6–13.3 kPa) |
| Base excess | Blood gas | −2 to +2 mmol/L |
| Lactate | Blood | <2.0 mmol/L |
Common questions
What is the normal ph (arterial) level in children?
pH (arterial) (Blood gas): 7.35–7.45.
Which acid–base / gases tests are covered?
pH (arterial), PaCO₂, PaO₂, Base excess, Lactate.
About this page
Compiled from standard paediatric references. Interpret against the child's clinical state and the ranges used by your own institution or laboratory.
Spotted something wrong? Report an error on this page — corrections from clinicians are welcome and are reviewed before any change is published.
Last reviewed 2026-08-12.