Q&A

Can venous blood be used to measure blood gas?

Can venous blood be used to measure blood gas?

In the absence of an arterial line, a venous blood gas sample can be used to evaluate carbon dioxide, pH and bicarbonate.

What is the difference between arterial blood gas and venous blood gas?

ABGs can be more difficult to obtain, are more painful and require arterial puncture that risks complications. A peripheral venous blood gas (VBG) can be obtained as the nurse obtains IV access upon patient arrival, requiring no additional sticks or risk of arterial injury.

How do you determine arterial blood from venous blood?

Arterial blood is the oxygenated blood in the circulatory system found in the pulmonary vein, the left chambers of the heart, and in the arteries. It is bright red in color, while venous blood is dark red in color (but looks purple through the translucent skin).

How do you get venous blood gas?

A VBG is obtained by placing a venous sample in the arterial blood gas analyser. VBGs are popular as it is far less painful for the patient to obtain a venous sample compared to an arterial sample. In addition, obtaining ABGs carries well known risks.

What is a normal venous blood gas?

TABLE I: Arterial and venous blood gas reference range

Arterial Venous
pH 7.35-7.45 7.31-7.41
pCO2 (kPa) 4.7 – 6.0 5.5 – 6.8
pCO2 (mmHg) 35 -45 41 – 51
Bicarbonate (mmol/L) 22-28 23-29

Why is arterial blood better for blood gas determination than venous blood?

Although arterial blood remains the gold standard sample for blood gas analysis, it is, compared with peripheral venous blood, a more difficult sample to obtain, and its collection is more painful and hazardous for the patient.

Is oxygen arterial or venous richer?

Located throughout the body, arteries transport nutrient-rich, oxygenated blood to organs and tissues. Arteries are more muscular and have smaller, rounder lumens (internal spaces) than veins.

What is the normal value of arterial blood gas?

Values that fall outside of the normal range, as well as shifts in blood pH that occur as a result are referred to as abnormal blood gases. The first step in evaluating a blood gas report is to look at pH. The normal range for arterial blood pH is 7.35 to 7.45.

What is a normal venous PO2?

As you would expect, venous blood has much less oxygen than arterial blood. Normal arterial pO2 (pAO2) is about 80-100 mm; the corresponding oxygen saturation is anything greater than 95% saturation.

What is the normal range of arterial blood?

The normal range for arterial blood pH is 7.35 to 7.45. A pH greater than 7.45 indicates alkalosis or more alkaline blood and a pH below 7.35 indicates acidosis or more acidic blood.

What is the normal range of blood gas?

The first step in evaluating a blood gas report is to look at pH. The normal range for arterial blood pH is 7.35 to 7.45. A pH greater than 7.45 indicates alkalosis or more alkaline blood and a pH below 7.35 indicates acidosis or more acidic blood . When the pH is greater than 7.0, the blood is alkaline and when it is less than 7.0, acidic.