This method is preferably used in peripheral blood smear preparation but applicable also in other hematologic examinations.
Procedure:
- Observe standard precautions . Check for latex allergy. If allergy is present, do not use latex-containing products.
- Obtain capillary blood from fingertips or earlobes (adults) or from the great toe or heel (infants).
- Disinfect puncture site, dry the site, and puncture skin with sterile disposable lancet no deeper than 2 mm. If povidone-iodine is used, allow to dry thoroughly.
- Wipe away the initial drop of blood. Collect subsequent drops in a microtube or prepare a smear directly from a drop of blood.
Note: Do not squeeze the site to obtain blood because this alters blood composition and invalidates test values. Warming the extremity or placing it in a dependent position may facilitate specimen collection.
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