Capillary blood sampling is used
when small volumes of blood are neces-sary for analysis, e.g. FBC, blood gas,
blood glucose. An automated device to pierce the skin is preferred over a
lancet, as it causes less pain and punctures to a predetermined depth, thereby
reducing the risk of underly-ing bone damage or infection.
device or sterile lancet.
sample bottles or capillary tubes.
wool or gauze swab.
heel surface outside the medial and lateral limits of calcaneous bone in the
young infant (Fig. 7.1).
site in the older child.
the heel or finger.
case of foot, hold dorsiflexed.
with an alcohol impregnated swab.
massage area to improve blood flow and use your hand as a tourniquet.
skin with an automated device or sterile lancet.
droplets of blood into an appropriate sample container or on to blood
glucose-measuring strip. Note that excessive squeezing leads to falsely high
serum potassium and haematocrit levels, and bruising.
sample has been collected stop any residual bleeding by local pressure with a
cotton wool ball or gauze swab.