How does capillary blood differ from venous blood?

Asked By: Indiara Trukhachev | Last Updated: 25th April, 2020
Category: medical health diabetes
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Capillary blood is not identical to venous blood. Capillary blood is a combination of arterial and venous blood. From the right side of the heart through the lungs, oxygenated arterial blood flows into the capillaries. There, oxygen and nutrients are distributed and exchanged for carbon dioxide.

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Also, what is the difference between capillary blood and venous blood?

It is well known that capillary blood has higher hemoglobin (Hb) and hematocrit (Hct) values than venous blood. In each group, venous platelet counts were significantly higher than the corresponding capillary values.

Also Know, why is venous blood most preferred for testing? Venous blood is the specimen of choice for most routine laboratory tests. Most laboratory reference ranges for blood analytes are based on venous blood. Arterial Blood. Deoxygenated blood is pumped from the right side of the heart to the lungs where it takes up oxygen.

Besides, is glucose higher in capillary or venous blood?

Normal physiology, specifically the rate at which glucose is extracted from blood by tissues, determines that in the postprandial (non-fasting) state, capillary (whole) blood glucose is slightly higher than venous (whole) blood.

What is the meaning of venous blood?

Venous blood is deoxygenated blood which travels from the peripheral vessels, through the venous system into the right atrium of the heart. Blood is oxygenated in the lungs and returns to the left atrium through the pulmonary veins.

36 Related Question Answers Found

What is the difference between capillary and venous blood glucose?

The level of capillary blood glucose is comparable to arterial blood glucose level while venous plasma glucose level is the estimate glucose after utilization of glucose by tissues.

Where is venous blood located?

n. Blood that has passed through the capillaries of various tissues other than the lungs, is found in the veins, in the right chambers of the heart, and in pulmonary arteries, and is usually dark red as a result of a lower content of oxygen.

What color is venous blood?

Arterial 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).

Can you use venous blood on a glucometer?


Using venous blood sample and measuring the glucose level in it by glucometer is an acceptable and advisable method, and capillary blood glucose measurement by using glucometer is not recommended for patients in coma.

What is venous blood glucose?

Comparability of venous and capillary glucose measurements in blood. AIM: Diabetes and glucose intolerance are diagnosed by measurement of glucose in blood. Glucose is usually measured as venous plasma or capillary whole blood and diagnostic criteria frequently provide equivalence estimates for these two methods.

What is the venous system?

Veins are a type of blood vessel that return deoxygenated blood from your organs back to your heart. The venous system refers to the network of veins that work to deliver deoxygenated blood back to your heart.

How does hematocrit affect blood glucose?

Variation in hematocrit can cause serious errors in blood glucose when measured by SMBG. Blood is composed of plasma and cells, and the percentage of red cells is the hematocrit. As seen in Figure 11, at a plasma glucose value of 100 mg/dl, the glucose in the red cells is approximately 70 mg/dl.

Why do you need to wipe off the first drop of blood?

Wipe away the first drop of blood (which tends to contain excess tissue fluid). pressure to the surrounding tissue until another drop of blood appears. Avoid "milking". The drop of blood must be big enough to fill the strip completely.

What is the purpose of capillary blood glucose?


Blood glucose monitoring is a way of testing the concentration of glucose in the blood (glycemia). The test is usually referred to as capillary blood glucose. Healthcare professionals advise patients with diabetes mellitus on the appropriate monitoring regimen for their condition.

What is normal capillary blood glucose?

Normal values
The normal blood glucose level (tested while fasting) for non-diabetics, should be between 3.9 and 7.1 mmol/L (70 to 130 mg/dL). The global mean fasting plasma blood glucose level in humans is about 5.5 mmol/L (100 mg/dL); however, this level fluctuates throughout the day.

What is the difference between serum and plasma glucose?

Plasma glucose values are about 11% higher than those of whole blood when the hematocrit is normal. With regards to the differences in blood glucose level between plasma and serum, some studies reported that plasma glucose is higher than serum glucose whereas other studies found no difference.

Why is capillary blood glucose value higher than venous blood glucose?

They concluded that arterial blood glucose is better measurement compared to capillary blood glucose in hypotensive patients. Capillary blood glucose levels were 20-25% higher than venous plasma glucose level in prandial state, whereas it was only 2- 5 mg/ dl higher in fasting state.

What is the difference between glucometer and lab test?

Lab tests generally demonstrate a higher level of accuracy than personal blood glucose meters, but even these machines can have a slight margin of error. So, if your lab result says that your blood glucose is 100 mg/dL, your meter might report your results as 85 mg/dL or 115 mg/dL and still be considered accurate.

What does high glucose serum mean?


Hyperglycemia means high (hyper) glucose (gly) in the blood (emia). Hyperglycemia is a defining characteristic of diabetes—when the blood glucose level is too high because the body isn't properly using or doesn't make the hormone insulin. Eating too many processed foods may cause your blood sugar to rise.

What are capillaries?

Capillary, in human physiology, any of the minute blood vessels that form networks throughout the bodily tissues; it is through the capillaries that oxygen, nutrients, and wastes are exchanged between the blood and the tissues.

Why do we take blood from veins?

Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation. These vessels are channels that distribute blood to the body.