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A blood lancet, or simply lancet, is a small medical implement used for capillary blood sampling. A blood lancet, sometimes called a lance, is similar to a scalpel style lancet, but with a double-edged blade and a pointed end. It can even be a specialized type of sharp needle.
Tests commonly conducted on the capillary blood collected are: Blood gas test – Fingerstick testing may be used for measuring blood gas tension values, blood pH, and the level and base excess of bicarbonate. Glucose levels – Diabetics often have a portable blood meter to check on their blood sugar.
Blood samples for testing are taken from arterial blood by a radial artery puncture, and from venous blood by venipuncture. Samples of capillary blood are taken using a lancet and capillary action. Capillary samples from the earlobe or the fingertip can be used to predict blood pH and the arterial partial pressure of carbon dioxide in the
Capillary blood sampling, generally by using a blood lancet for puncture, followed by sampling by capillary action with a test strip or small pipe. This is common for routine diabetic monitoring for glucose. Venous blood sampling, also called phlebotomy. It is generally done by venipuncture (which can also be used for intravenous therapy).
Phlebotomy is the process of making a puncture in a vein, usually in the arm, with a cannula for the purpose of drawing blood. [1] The procedure itself is known as a venipuncture , which is also used for intravenous therapy .
Capillary blood sampling can be used to test for blood glucose (such as in blood glucose monitoring), hemoglobin, pH and lactate. [ 30 ] [ 31 ] It is generally performed by creating a small cut using a blood lancet , followed by sampling by capillary action on the cut with a test strip or small pipette . [ 32 ]
Capillary bleeding: Capillary bleeding usually occurs in superficial wounds, such as abrasions. The colour of the blood may vary somewhat ( distal portion of circulation with oxygenated and unoxygenated blood mixing), and generally oozes in small amounts, as opposed to flowing or spurting.
The culture will determine if there are pathogens in the blood. Normally blood is sterile. When drawing blood from cultures use a sterile solution such as Betadine rather than alcohol. This is done using sterile gloves, while not wiping away the surgical solution, touching the puncture site, or in any way compromising the sterile process.