NCCT National Certified Phlebotomy Technician 2 — Questions and Answers
Question 1: What is the primary purpose of the NCCT certification for phlebotomy technicians?
- To allow phlebotomists to prescribe medications
- To validate competency in phlebotomy knowledge and skills through a national credential (Correct answer)
- To replace the need for on-the-job training
- To permit phlebotomists to interpret laboratory results
Correct answer: To validate competency in phlebotomy knowledge and skills through a national credential
NCCT certification validates that a phlebotomy technician has demonstrated competency in the knowledge and skills required for safe and effective blood collection.
The National Center for Competency Testing (NCCT) offers the Certified Phlebotomy Technician (CPT) credential to validate that individuals meet established competency standards for phlebotomy practice. The certification demonstrates to employers, patients, and regulatory bodies that the phlebotomist has passed a comprehensive examination.
Question 2: Which of the following blood components carries oxygen from the lungs to body tissues?
- White blood cells
- Platelets
- Red blood cells (erythrocytes) (Correct answer)
- Plasma proteins
Correct answer: Red blood cells (erythrocytes)
Red blood cells contain hemoglobin, which binds oxygen in the lungs and transports it to tissues throughout the body.
Red blood cells (erythrocytes) are the most abundant blood cells (4.5-5.5 million per microliter) and their primary function is oxygen transport. Each RBC contains approximately 270 million molecules of hemoglobin, an iron-containing protein that reversibly binds oxygen.
Question 3: The tricuspid valve is located between which two chambers of the heart?
- Left atrium and left ventricle
- Right atrium and right ventricle (Correct answer)
- Right ventricle and pulmonary artery
- Left ventricle and aorta
Correct answer: Right atrium and right ventricle
The tricuspid valve (with three leaflets) is located between the right atrium and right ventricle, preventing backflow of blood during ventricular contraction.
The heart has four valves that ensure unidirectional blood flow. The tricuspid valve (three cusps/leaflets) sits between the right atrium and right ventricle. When the right atrium contracts, the tricuspid valve opens to allow deoxygenated blood to flow into the right ventricle.
Question 4: Which of the following is a function of platelets (thrombocytes)?
- Fighting infection
- Transporting oxygen
- Initiating blood clot formation at injury sites (Correct answer)
- Producing antibodies
Correct answer: Initiating blood clot formation at injury sites
Platelets are cell fragments that play a crucial role in hemostasis by adhering to damaged blood vessel walls and aggregating to form the initial platelet plug.
Platelets (thrombocytes) are small, disc-shaped cell fragments produced by megakaryocytes in the bone marrow. Normal platelet count is 150,000-400,000 per microliter. When a blood vessel is damaged, platelets adhere to exposed collagen, activate, and aggregate to form a platelet plug (primary hemostasis).
Question 5: What is the normal pH range of human blood?
- 6.80 - 7.10
- 7.00 - 7.20
- 7.35 - 7.45 (Correct answer)
- 7.50 - 7.70
Correct answer: 7.35 - 7.45
Normal blood pH is tightly regulated between 7.35 and 7.45, which is slightly alkaline. Values outside this range indicate acidosis or alkalosis.
Blood pH is one of the most tightly regulated parameters in the body, maintained between 7.35-7.45 by buffer systems, the lungs, and the kidneys. A pH below 7.35 is acidosis, and above 7.45 is alkalosis. pH below 6.8 or above 7.8 is generally incompatible with life.
Question 6: Which layer of a blood vessel wall is in direct contact with blood?
- Tunica adventitia (externa)
- Tunica media
- Tunica intima (endothelium) (Correct answer)
- Vasa vasorum
Correct answer: Tunica intima (endothelium)
The tunica intima is the innermost layer of blood vessels, lined with endothelial cells that are in direct contact with flowing blood.
Blood vessel walls have three layers: the tunica intima (innermost, endothelial cells in contact with blood), the tunica media (middle, smooth muscle and elastic fibers), and the tunica adventitia/externa (outermost, connective tissue). When the intima is damaged during venipuncture, exposed collagen triggers platelet adhesion and the clotting cascade.
NCCT National Certified Phlebotomy Technician 2
What is the primary purpose of the NCCT certification for phlebotomy technicians?