Distinguish from the appearance

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The arterial blood was bright red, and the pulse was visible on the inner surface of the syringe. But when the patient's peripheral circulation is poor, the pulsation is not obvious. venous blood gasIn severe hypoxia, arterial blood is also darker and difficult to distinguish.

monitor blood oxygen saturation

Critically ill patients have ECG monitoring and non-invasive oxygen saturation monitoring, record the non-invasive oxygen saturation value when blood gas is drawn, and compare it with the blood oxygen saturation in the blood gas test result. If the difference is within 5%, the blood drawn is regarded as arterial blood .

For example, when the blood gas is drawn, the non-invasive blood oxygen saturation is 97%, and the blood oxygen saturation in the blood gas test result is above 92%, and it can be concluded that it is arterial blood. If it is less than 92%, it may be venous blood.

Differentiate from the results of blood gas analysis

After reviewing a large amount of literature, we found that there are some values ​​that can basically distinguish arteriovenous blood.

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