In venous blood sampling, a needle is inserted into a vein to collect a sample of blood for testing. Show Peripheral veins, typically the antecubital veins, are the usual sites for venous blood sampling.
Absolute contraindications
Relative contraindications
In the above situations, use another site (eg, the opposite arm) for venipuncture. Coagulopathy is not a contraindication, but sites must be compressed for a longer time after venipuncture. Complications are uncommon and include
Optional equipment includes
Do a preliminary inspection (nonsterile) to identify a suitable vein: Apply a tourniquet, have the patient make a fist, and palpate using your index finger to locate a large-diameter vein that is
nonmobile and has good turgor. To help distend and locate veins, tap a potential site with your fingertips. It may help to allow the arm to hang down, increasing venous pressure. Use a vein-finder device if a suitable vein is not readily seen or palpated. After identifying a suitable cannulation site, remove the tourniquet. Apply anesthetic if it is being used and
allow adequate time for it to take effect (eg, 1 to 2 minutes for gas injector, 30 minutes for topical). Cleanse the skin site with antiseptic solution, beginning at the needle-insertion site and making several outwardly expanding circles. Wait for the antiseptic solution to dry completely. If applying povidone-iodine, wipe it off with alcohol and allow the alcohol to dry. If blood is being obtained for blood cultures, vigorously cleanse the site with alcohol for 30 seconds, allow the alcohol to dry, and then swab in outwardly expanding, overlapping circles using chlorhexidine or povidone-iodine. Wait for the antiseptic effect to occur (1 minute for chlorhexidine or 1.5 to 2 minutes for iodine). Wipe off povidone-iodine with alcohol and allow the alcohol to dry. For children, swab the site 3 times using only alcohol. After this point, do not touch the skin site with any nonsterile item. Try to access the vein efficiently and collect the blood sample within 30 seconds after tourniquet placement. Do not leave the tourniquet on for > 1 minute.
* When multiple blood tests are to be done, blood should be allocated to the collection tubes in a proper sequence; first cultures, then tubes with anticoagulant, and then others. Note that the rubber tops of blood-culture bottles must be properly disinfected prior to introducing the blood sample (eg, by scrubbing each top with separate 70% alcohol wipes for 30 seconds and allowing it to air-dry).
In what case would a capillary puncture be contraindicated?Capillary collection should not be performed on adult patients if adequate veins are available and patient is willing to allow their use. Also, capillary collection should be avoided if patient is dehydrated, has edema, or presents with poor circulation to the extremities.
What are four contraindications to capillary puncture?There are some instances where a dermal puncture is prohibited or not recommended.. Mastectomy patients. As a general rule, a dermal puncture, or a venipuncture, should not be performed on the side affected by a mastectomy. ... . Edematous site. ... . Dehydrated patient. ... . Fingerstick on a newborn or young infant.. What are the areas that should be avoided with a capillary puncture?The posterior heel and toe should be avoided as puncture sites because the distance between the skin surface and the bone in each case is only 2.33 or 2.19 mm, respectively, which means greater risk of bone damage (3, 13).
Which of the following conditions disqualifies a site for capillary puncture?capillary puncture equiptment and procedures. |