When is it appropriate for a phlebotomist to repeat a blood draw?

Repeating a blood draw is appropriate when the initial sample is insufficient, contaminated, or improperly collected. This ensures that the laboratory receives a sample that can provide accurate test results. If the sample volume is inadequate for testing, or if the sample has been compromised due to contamination (for example, improper skin antisepsis leading to bacterial exposure), or if the collection technique was flawed (such as hemolysis, where red blood cells break down), a new draw is necessary.

This practice is crucial because accurate diagnostic information is vital for effective patient care, and drawing a new sample helps avoid misdiagnosis or the need for further testing that could arise from an initial faulty sample.

The other scenarios listed do not justify a repeat blood draw in a standard clinical context. While patient requests could be considered in some settings, they do not take precedence over the need for valid, quality specimens for laboratory analysis. Only repeating a draw after a failed attempt, such as when the needle does not obtain blood, does not cover all scenarios where a repeat is necessary. An arbitrary waiting period of 24 hours is not a standard practice guideline and is not necessary when there are valid reasons to repeat the collection.