NHA Phlebotomy Certification Practice Exam

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Prepare for the NHA Phlebotomy Certification Exam. Learn with study guides and multiple choice questions. Each question offers detailed explanations. Achieve success on your certification test.

Practice this question and more.

Which of the following needles has the largest diameter?

16 gauge.
18 gauge.
20 gauge.
22 gauge.

The correct answer is: 16 gauge.

The needle gauge system operates on a unique principle where a smaller gauge number corresponds to a larger diameter of the needle. In this system, the 16 gauge needle has the largest diameter compared to the other options listed. Needles of smaller gauge numbers (such as 16 gauge) allow for a greater volume of fluid to be drawn or infused, making them suitable for specific medical situations, such as obtaining blood from patients with difficult veins or when rapid transfusions are necessary. Understanding this gauge system is crucial for a phlebotomist, as the choice of needle can significantly impact patient care and the success of blood collection procedures. Therefore, recognizing that a 16 gauge needle is wider than 18, 20, or 22 gauge needles allows healthcare professionals to make informed decisions based on clinical requirements.