Blood gases

For chemical pathology of lung , bronchi, bronchiole and alveolar ducts and sacs click here

Definition:  Carbon dioxide determines acidity; Oxygen determines level of oxygenation of tissue

Method: Blood

Normal value: pH- Arterial:  7.38-7.44
Venous: 7.36-7.41
pCO
2- Arterial: 35-40 mm Hg
            Venous: 40-45 mm Hg
PO
2
- Arterial: 95-100 mm Hg

Abnormality : High carbon dioxide in blood assists the development of respiratory acidosis. Low carbon dioxide level helps to develop in blood respiratory alkalosis.

 

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