What does capillary blood contain?

It’s Not Just About the Blood Collection Technique Compared to a venous plasma, capillary plasma contains higher concentrations of proteins, calcium and chloride, and lower levels of potassium, sodium, and urea nitrogen.

Is potassium higher in capillary or venous blood?

Capillary samples are, on average, more hemolyzed than venous samples; therefore, potassium is systematically higher in capillary samples. For a given amount of free hemoglobin (hemolysis), the increase in potassium is higher in a capillary sample compared to a venous sample.

What is the composition mixture of blood taken from a puncture?

It is a mixture of venous, arterial, and capillary blood as well as interstitial and cellular fluids. Because of this mixture, capillary blood more closely resembles arterial rather than venous blood and the reference values will differ.

What is collected first in capillary puncture?

Order of draw. With skin punctures, the haematology specimen is collected first, followed by the chemistry and blood bank specimens.

Why is glucose higher in capillary blood?

The glucose concentration in the water that makes up plasma is equal to that of erythrocytes. Plasma has greater water content than erythrocytes and, therefore, exhibits higher glucose levels than whole blood.

What is a capillary puncture quizlet?

What is a capillary puncture? Also known as dermal puncture, capillary puncture is a quick, safe, and efficient means of collecting a blood specimen. A small sterile lancet is used to puncture the skin and capillaries to create a blood flow.

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.

What is capillary glucose?

Abbreviation: CBG. The level of circulating blood glucose as measured by glucometer analysis of a fingerstick sample. Regular measurements of CBG allow diabetic patients to make frequent adjustments in their caloric intake, exercise levels, and use of antidiabetic medications, esp.

What type of blood is collected during a skin puncture?

Skin puncture blood is a mixture of undetermined proportions of blood from arterioles, venules, capillaries, and interstitial and intracellular fluids. The arterial portion can be increased by warming the site prior to collection. This increases the blood flow as much as sevenfold.

What is capillary collection?

Capillary blood is obtained by pricking a finger in adults and a heel in infants and small children. The specimen is then collected with a pipette, placed on a glass slide or a piece of filter paper, or is absorbed by the tip of a microsampling device.

What is a capillary blood glucose?

Abbreviation: CBG. The level of circulating blood glucose as measured by glucometer analysis of a fingerstick sample. Regular measurements of CBG allow diabetic patients to make frequent adjustments in their caloric intake, exercise levels, and use of antidiabetic medications, esp. insulin.

What is capillary blood gas?

CBGS 2.0 DESCRIPTION: Capillary blood gas (CBG) samples may be used in place of samples from arterial punctures or. indwelling arterial catheters to estimate acid-base balance (pH) and adequacy of ventilation. (PaCO2).(1-3) Capillary PO2 measurements are of little value in estimating arterial oxygenation.