Which practice helps minimize tissue fluid contamination in capillary blood samples?

Which practice helps minimize tissue fluid contamination in capillary blood samples?

• A. Collect from the initial drop and combine with subsequent drop
• B. Avoid warming the site
• C. Use the heel warm-up step
• D. Wipe away the first drop of blood before collection

Answer: (D)

Wiping away the first drop of blood is the best practice because the initial drop often contains tissue/interstitial fluid from the puncture site. If that drop is collected, its fluid can dilute or alter test results. By discarding the first drop and collecting subsequent drops, you obtain a specimen that more accurately reflects the true capillary blood for reliable testing. Warming the site can help blood flow, but it doesn’t remove the contamination risk, and collecting the first drop with later drops would reintroduce tissue fluids into the sample.

Wiping away the first drop of blood is the best practice because the initial drop often contains tissue/interstitial fluid from the puncture site. If that drop is collected, its fluid can dilute or alter test results. By discarding the first drop and collecting subsequent drops, you obtain a specimen that more accurately reflects the true capillary blood for reliable testing. Warming the site can help blood flow, but it doesn’t remove the contamination risk, and collecting the first drop with later drops would reintroduce tissue fluids into the sample.