Study 3 Capillary Blood Collection with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
When is capillary blood collection useful, and what limits its use?
It is useful when only a small volume is needed or venous access is difficult, but it cannot provide enough blood for many tests. Use it only when the test and laboratory permit it.
Which finger sites are generally preferred for adults?
Use the fleshy side of the distal pad of the middle or ring finger. Avoid the thumb, index finger, and little finger.
In which direction should a finger puncture cross the fingerprint ridges?
Puncture across the fingerprint ridges, not parallel to them.
Where is capillary blood usually collected from infants and young children?
Use the medial or lateral plantar surface of the heel. Avoid the center and back curve, where bone is closer to the skin, and do not puncture a newborn’s fingers.
Which conditions make a capillary puncture site unsuitable?
Avoid sites that are swollen, infected, bruised, scarred, cold, or recently punctured.
Why shouldn’t age alone determine a child’s puncture site?
Age and size guide site choice, but clinical judgment and local policy also matter. Weight, development, lancet depth, and test requirements can affect the decision.
What must happen after cleaning the site and before puncturing?
Clean the site with the approved antiseptic and let it dry completely before puncturing.
What is the safe technique for making a capillary puncture?
Use a sterile, single-use lancet for one quick, deliberate puncture. Never reuse it or repeatedly puncture the same spot.
Why should the first drop of capillary blood be wiped away?
Wipe away the first drop because it may contain tissue fluid or surface debris.
What is the collection order for multiple capillary specimens?
Collect hematology specimens first, followed by chemistry and then blood-bank specimens. This capillary order is not the venipuncture tube order.
Why should capillary blood not be collected by forceful squeezing?
Do not milk, scrape, or squeeze the site forcefully. This can introduce tissue fluid or cause hemolysis, affecting results.
How should capillary collection containers be filled and mixed?
Fill containers to the required amount and mix additive tubes as directed by the manufacturer or laboratory.