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Blood-Gas Reference Ranges

By Susan E. Fielder, DVM, MS, DACVP (Clinical Pathology), Oklahoma State University

Blood-Gas Reference Ranges

Measure

Units

Dog

Cat

Cow

Horse

In Conventional (USA) Units

pH

7.31–7.42

7.24–7.40

7.35–7.50

7.32–7.44

HCO3

mEq/L

17–24

17–24

20–30

24–30

pCO2

mmHg

29–42

29–42

35–44

36–46

pO2

mmHg

85–95

85–95

92

94

In SI Units

HCO3

µmol/L

17–24

17–24

20–30

24–30

pCO2

kPa

3.86–5.60

3.86–5.60

2.67–3.99

4.67–6.13

pO2

kPa

11.3–12.66

11.3–12.66

12.26

12.53

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