During capillary collection, why is the first drop wiped away?

Prepare for the CAMLPR Specimen Collection Competency Test. Practice with diverse question sets including multiple-choice and flashcards. Each question includes hints and explanations to help you become proficient before the exam.

When collecting capillary blood, the first drop is wiped away because it can contain tissue fluid, skin oils, and debris from the puncture site that would dilute or contaminate the sample. This initial fluid can skew test results, especially for measurements sensitive to dilution or surface contaminants. By discarding that first drop, the subsequent drops provide a sample that more accurately reflects the true capillary blood, leading to more reliable and consistent test results. The rest of the collection then proceeds with drops that are less likely to be contaminated, assuming the site has been prepared properly and gentle pressure is used to avoid squeezing, which can introduce more tissue fluid.