Venipuncture allows procurement of larger quantities of blood for testing. Usually, the antecubital veins are the veins of choice because of ease of access. Blood values remain constant no matter which venipuncture site is selected, so long as it is venous and not arterial blood. This procedure is performed by medical laboratory scientists, medical practitioners, some EMTs,paramedics, phlebotomists, dialysis technicians, and other nursing staff. Venipuncture is one of the most routinely performed invasive procedures and is carried out for any of five reasons:
For a detailed guide in venipuncture and collecting blood from other sites, please read "Basic Phlebotomy or Venipuncture - Blood Collection Guide".
- to obtain blood for diagnostic purposes
- to monitor levels of blood components
- to administer therapeutic treatments including medications, nutrition, or chemotherapy
- to remove blood due to excess levels of iron or erythrocytes (red blood cells);
- to collect blood for later uses, mainly transfusion either in the donor or in another person.
Blood analysis is one of the most important diagnostic tools available to clinicians within healthcare. Its data is relied upon in the clinical setting for interpretation of a myriad of clinical signs and symptoms and developing skills in venipuncture can facilitate holistic and timely treatment.
Minute quantities of blood may be taken by fingersticks sampling and collected from infants by means of a heel stick or from scalp veins with a winged infusion needle.
Phlebotomy (incision into a vein) is also the treatment of certain diseases such as hemochromatosis and primary and secondary polycythemia.
For a detailed guide in venipuncture and collecting blood from other sites, please read "Basic Phlebotomy or Venipuncture - Blood Collection Guide".
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