Arterial blood may also be obtained from a vascular access device VAD inserted in an artery such as a femoral arterial line or catheter. Capillary Blood Capillary blood is obtained from capillary beds that consist of the smallest veins venules and arteries arterioles of the circulatory system. The venules and arterioles join together in capillary beds forming a mixture of venous and arterial blood. The specimen from a dermal puncture will therefore be a mixture of arterial and venous blood along with interstitial and intracellular fluids.
Capillary blood is often the specimen of choice for infants, very young children, elderly patients with fragile veins, and severely burned patients. Point-of-care testing is often performed using a capillary blood specimen. The good news is that capillary blood sampling is becoming a more practical alternative. The hurdles to its widespread adoption are being overcome, it is beginning to proliferate more widely, and its applications are becoming more useful.
Here are a few big reasons to consider capillary blood collection , especially if you weren't ready to in the past. Along with a less painful, less stressful sampling event usually requiring only the quick prick of a fingertip , the latest methods of capillary blood collection offer generous logistical advantages.
Implementing a microsampling workflow means eliminating cold chain shipping and storage, freeing up time and budget for more important and modern purposes.
Studies show that patients and participants overwhelmingly prefer capillary blood sampling, particularly using microsampling techniques, over traditional venipuncture. It's more comfortable, and it allows patients greater convenience and agency, because With capillary blood sampling using the latest microsampling methods , patients can forgo visits to the clinic and wave goodbye to their phlebotomists.
Two forms of active identification are required. This information must match the requisition. Select the appropriate microtainers for the specimens to be collected. Any microtainers containing additives should be tapped to dislodge additives from the walls and top. Do not attempt a capillary puncture more than twice. Using a sterile lancet, puncture the most medial or lateral portion of the plantar surface of the heel, medial to a line drawn posteriorly from the mid great toe to the heel.
Previous puncture sites should be avoided. Allow another large drop of blood to form. Lightly touch the microtainer capillary collection device or filter paper to the LARGE drop of blood. Collect drops of blood into the collection device by gently massaging the heel. Avoid excessive pressure that may squeeze tissue fluid into the drop of blood. Fill the microtainer tube s as needed, adhering to the order of draw. When finished, clean the site and apply pressure with clean gauze to stop the bleeding.
Apply an adhesive bandage. Cleanse the fingertip of the 3rd middle or 4th ring finger with an alcohol prep. Using a sterile lancet, puncture the fingertip in the fleshy part of the finger, slightly to the side of the center and across perpendicular to the grooves of the fingertip.
Figure 1 - The effect of time and capillary blood flow on hemoglobin results. The following steps demonstrate how to take a proper capillary blood sample to ensure accurate POC hemoglobin measurements. It has three core divisions: Point of Care including hemoglobin and HbA1c analyzers; Central Laboratory including the manufacture of enzymes and clinical chemistry; and Molecular Diagnostics which incorporates a unique DNA enrichment technology, PointMan, and a portfolio of molecular testing services.
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Correct choice of lancet — The lancet must make a sufficiently deep puncture to ensure an adequate flow of blood. For children aged below 8 years, the penetration depth should not exceed 1.
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