Describe proper capillary (fingerstick) collection technique and common pitfalls for adult patients.

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Multiple Choice

Describe proper capillary (fingerstick) collection technique and common pitfalls for adult patients.

The main idea is to collect capillary blood cleanly and efficiently so the test results reflect blood from the circulation rather than tissue fluid or damaged cells, while minimizing pain and tissue injury for the patient. Begin by warming the puncture site to increase blood flow, then choose a fingertip as the collection site. Clean with alcohol and let it dry completely to prevent contamination and stinging. Use a shallow puncture depth with a lancet to minimize tissue trauma. After puncture, wipe away the first drop of blood—this helps remove tissue fluid that can skew results. Allow subsequent drops to form naturally and collect them without squeezing or milking the finger, which can dilute the sample with interstitial fluid or cause hemolysis. Fill the microcollection tubes to the required volume as directed, handling the drop gently to avoid creating microhemorrhages. Avoid deep punctures, excessive squeezing, and using a venipuncture needle for a capillary sample. If bleeding is excessive or a bruit/mhematoma develops, apply gentle pressure and stop further attempts. These steps help ensure accuracy and patient comfort, while reducing common pitfalls like contamination from tissue fluid, insufficient volume, or damaged cells from aggressive squeezing or deep punctures.

The main idea is to collect capillary blood cleanly and efficiently so the test results reflect blood from the circulation rather than tissue fluid or damaged cells, while minimizing pain and tissue injury for the patient.

Begin by warming the puncture site to increase blood flow, then choose a fingertip as the collection site. Clean with alcohol and let it dry completely to prevent contamination and stinging. Use a shallow puncture depth with a lancet to minimize tissue trauma. After puncture, wipe away the first drop of blood—this helps remove tissue fluid that can skew results. Allow subsequent drops to form naturally and collect them without squeezing or milking the finger, which can dilute the sample with interstitial fluid or cause hemolysis. Fill the microcollection tubes to the required volume as directed, handling the drop gently to avoid creating microhemorrhages. Avoid deep punctures, excessive squeezing, and using a venipuncture needle for a capillary sample. If bleeding is excessive or a bruit/mhematoma develops, apply gentle pressure and stop further attempts.

These steps help ensure accuracy and patient comfort, while reducing common pitfalls like contamination from tissue fluid, insufficient volume, or damaged cells from aggressive squeezing or deep punctures.

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