Quiz: Phlebotomy Essentials and Blood Science — 35 questions

1. What should a phlebotomist do with a used needle immediately after withdrawing it from a patient?

A. Place it directly into a sharps container without recapping it

B. Recap it carefully before placing it into a sharps container

C. Set it on the tray until all specimens have been labeled

D. Bend it before disposal to reduce the risk of puncture

Answer: (A)

Explanation

Immediate placement in a sharps container without recapping reduces the risk of needlestick injuries. Recapping is prohibited because it can expose the worker to an accidental puncture.

2. At an accident scene, what does the Good Samaritan law generally encourage a healthcare professional to do?

A. Refuse assistance whenever the scene involves a potentially serious injury

B. Guarantee a successful outcome before beginning emergency care

C. Provide any treatment requested by the patient regardless of professional training

D. Provide care within the professional’s training without fear of a negligence lawsuit

Answer: (D)

Explanation

Good Samaritan protection encourages trained professionals to provide care within their level of training at an accident scene. It does not authorize treatment beyond that training or guarantee a successful outcome.

3. What should a phlebotomist do when a patient refuses venipuncture?

A. Report the refusal and the actions taken to the nurse or doctor

B. Proceed with the draw after explaining that the specimen is medically necessary

C. Ask a nearby patient to persuade the individual to accept the procedure

D. Discard the equipment and leave the refusal undocumented

Answer: (A)

Explanation

A refusal should be reported promptly to the nurse or doctor along with the actions taken. Proceeding without consent would disregard the patient’s decision and the required reporting process.

4. Which statement best defines informed consent for a venipuncture procedure?

A. A signed form confirming that the patient has arrived for laboratory testing

B. An explanation of the procedure provided after the specimen has already been collected

C. Permission given after the patient receives information about the procedure, risks, outcomes, and alternatives

D. Permission obtained from a staff member when the patient appears anxious about the procedure

Answer: (C)

Explanation

Informed consent requires permission based on information about the procedure, its risks, expected outcomes, and alternatives. A signature or general explanation without this information does not by itself establish informed consent.

5. Which sequence correctly describes the basic chain of infection?

A. Mode of transmission, antibiotic treatment, and reservoir

B. Susceptible host, immune response, and source

C. Source, mode of transmission, and susceptible host

D. Pathogen, vaccine response, and environmental surface

Answer: (C)

Explanation

The chain of infection includes a source that produces pathogens, a mode of transmission, and a susceptible host that receives them. An immune response and antibiotic treatment are not links in this basic three-part sequence.

6. Which group contains the five main modes of infection transmission?

A. Airborne, respiratory, digestive, contact, and protective transmission

B. Droplet, surgical, environmental, vector-borne, and blood transmission

C. Contact, droplet, airborne, vehicle, and vector-borne transmission

D. Contact, fever, airborne, vehicle, and immune transmission

Answer: (C)

Explanation

The five main categories are direct or indirect contact, droplet, airborne, vehicle, and vector-borne transmission. Fever and immune response describe effects or defenses rather than transmission modes.

7. Which practice is identified as the most important means of preventing the spread of infection?

A. Using a face shield during specimen collection

B. Cleaning the work surface after each procedure

C. Washing the hands thoroughly

D. Wearing gloves during every patient interaction

Answer: (C)

Explanation

Handwashing is the most important means of preventing the spread of infection because it removes or reduces organisms that can be transferred between people and surfaces. Protective equipment and environmental cleaning are useful but do not replace hand hygiene.

8. Which vein is the most commonly used venipuncture site in the antecubital fossa?

A. Basilic vein

B. Radial vein

C. Median cubital vein

D. Cephalic vein

Answer: (C)

Explanation

The median cubital vein is the preferred and most commonly used vein in the antecubital fossa. The cephalic and basilic veins are recognized alternatives in that region, while the radial vein is not one of the three major antecubital veins listed.

9. How long may a tourniquet remain on a patient before the risk of hemoconcentration increases?

A. Five minutes

B. One minute

C. Two minutes

D. Ten minutes

Answer: (B)

Explanation

A tourniquet may remain in place for one minute; leaving it on longer can cause hemoconcentration. The two-minute limit is a common misconception and does not match the recommended duration.

10. Which condition is correctly matched with its description?

A. Hematoma—vein inflammation accompanied by clot formation

B. Phlebitis—blood accumulated in tissue around a punctured vein

C. Thrombophlebitis—vein inflammation accompanied by clot formation

D. Hematoma—inflammation of the vein without blood outside the vessel

Answer: (C)

Explanation

Thrombophlebitis combines inflammation of a vein with clot formation. A hematoma is blood accumulated in surrounding tissue, whereas phlebitis is inflammation of a vein without the defining clot formation described for thrombophlebitis.

11. From which site should blood generally not be drawn?

A. The median cubital vein when it is clearly visible and stable

B. An intravenous fluid site or a permanent artificial arteriovenous fistula site

C. A cephalic vein selected as an alternative antecubital site

D. A suitable antecubital vein in the arm without an infusion

Answer: (B)

Explanation

Blood should not be drawn from an intravenous fluid site or a permanent artificial arteriovenous fistula site because these locations can compromise specimen accuracy or patient safety. Suitable antecubital veins may be used when appropriately assessed.

12. Which pathway carries deoxygenated blood from the right ventricle to the lungs and returns oxygenated blood to the heart?

A. Pulmonary circulation

B. Portal circulation

C. Coronary circulation

D. Systemic circulation

Answer: (A)

Explanation

Pulmonary circulation transports deoxygenated blood from the right ventricle to the lungs and brings oxygenated blood back to the heart. Systemic circulation instead distributes oxygenated blood from the left ventricle to body tissues.

13. A blood vessel leaves the left ventricle and distributes oxygenated blood throughout the body; which circulation does it belong to?

A. Coronary circulation

B. Pulmonary circulation

C. Systemic circulation

D. Portal circulation

Answer: (C)

Explanation

Systemic circulation carries oxygenated blood from the left ventricle to the body. Pulmonary circulation serves the route between the right side of the heart and the lungs.

14. Which valve is located between the right atrium and right ventricle?

A. Pulmonary valve

B. Tricuspid valve

C. Aortic valve

D. Mitral valve

Answer: (B)

Explanation

The tricuspid valve lies between the right atrium and right ventricle. The mitral, or bicuspid, valve is located on the left side of the heart.

15. Which layer of the heart wall is the muscular middle layer?

A. Epicardium

B. Pericardial cavity

C. Endocardium

D. Myocardium

Answer: (D)

Explanation

The myocardium is the muscular middle layer of the heart wall. The endocardium lines the inside, while the epicardium forms the outer layer where the coronary arteries are found.

16. What are the two major components of blood?

A. Hemoglobin and electrolytes

B. Water and white cells

C. Plasma and formed elements

D. Red cells and hormones

Answer: (C)

Explanation

Blood consists of plasma and formed elements. Plasma is the liquid portion, whereas formed elements are the cellular portion.

17. What proportions of circulating blood are normally plasma and formed elements, respectively?

A. 55% plasma and 45% formed elements

B. 50% plasma and 50% formed elements

C. 45% plasma and 55% formed elements

D. 60% plasma and 40% formed elements

Answer: (A)

Explanation

Plasma makes up about 55% of circulating blood, and formed elements make up about 45%. Reversing these proportions confuses the liquid and cellular components.

18. What protein in erythrocytes carries oxygen through the blood?

A. Hemoglobin

B. Albumin

C. Insulin

D. Fibrinogen

Answer: (A)

Explanation

Hemoglobin is the oxygen-carrying protein contained in erythrocytes. Fibrinogen and albumin are plasma proteins with different functions.

19. Approximately how long does a normal red blood cell live?

A. 30 days

B. 365 days

C. 120 days

D. 1 to 2 days

Answer: (C)

Explanation

A normal red blood cell has a lifespan of about 120 days. The 1-to-2-day period describes the maturation of a reticulocyte into a mature erythrocyte.

20. What is the primary function of white blood cells?

A. Maintaining blood glucose levels

B. Carrying hormones through plasma

C. Protecting the body against infection

D. Transporting oxygen to body tissues

Answer: (C)

Explanation

White blood cells protect the body against infection as part of immune defense. Red blood cells, rather than white blood cells, transport oxygen.

21. Which list contains the five recognized types of white blood cells?

A. Lymphocytes, erythrocytes, monocytes, megakaryocytes, and eosinophils

B. Neutrophils, macrophages, platelets, eosinophils, and plasma cells

C. Neutrophils, lymphocytes, monocytes, eosinophils, and basophils

D. Erythrocytes, reticulocytes, platelets, monocytes, and basophils

Answer: (C)

Explanation

The five types are neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Erythrocytes and platelets are formed elements but are not types of white blood cells.

22. Which change is most characteristic of neutrophils during a bacterial infection?

A. Their proportion commonly rises above its usual range

B. They mature into oxygen-carrying erythrocytes

C. They become the main producers of circulating antibodies

D. Their proportion commonly falls below its usual range

Answer: (A)

Explanation

Neutrophils are phagocytic and commonly increase during bacterial infections; they normally comprise about 40%–60% of white blood cells. Antibody production is associated with lymphocyte functions, not neutrophil maturation.

23. Which sequence correctly represents the major stages of hemostasis after a blood vessel is injured?

A. Platelet, vascular, fibrinolysis, and coagulation stages

B. Fibrinolysis, immune, platelet, and vascular stages

C. Vascular, platelet, coagulation, and fibrinolysis stages

D. Coagulation, vascular, platelet, and immune stages

Answer: (C)

Explanation

Hemostasis repairs injured vessels through vascular, platelet, coagulation, and fibrinolysis stages. The other sequences rearrange these stages or replace one with immune activity, which is not one of the listed hemostatic stages.

24. Which description best defines a pathogen?

A. A substance that prevents blood from undergoing coagulation

B. An organism with or upon which a parasite lives

C. A disease-producing agent such as a bacterium, virus, or fungus

D. An organism that carries a communicable disease between hosts

Answer: (C)

Explanation

A pathogen is an agent capable of producing disease, including microorganisms and parasitic organisms. A vector, in contrast, carries a communicable disease between hosts.

25. Which condition involves a reduction in the number of normal red blood cells?

A. Parasitic infestation

B. Anemia

C. Anticoagulation

D. Pathogenic infection

Answer: (B)

Explanation

Anemia is defined as a condition in which normal red blood cells are reduced. Anticoagulation concerns prevention of clotting rather than a decrease in red blood cells.

26. Which laboratory section performs culture and sensitivity testing to identify microorganisms and determine effective antibiotic therapy?

A. Blood bank

B. Hematology

C. Immunochemistry

D. Microbiology

Answer: (D)

Explanation

Microbiology detects pathogenic microorganisms and uses culture and sensitivity testing to identify them and assess antibiotic effectiveness. Immunochemistry evaluates immune-related substances rather than performing this organism-and-antibiotic testing.

27. Which pairing correctly matches a tube color with its anticoagulant?

A. Green tube — sodium fluoride

B. Lavender tube — sodium or lithium heparin

C. Light-blue tube — sodium citrate

D. Light-blue tube — ethylenediaminetetraacetic acid

Answer: (C)

Explanation

The light-blue tube contains sodium citrate, which is one of the specified anticoagulants associated with tube color. EDTA belongs in the lavender tube, heparin in the green tube, and sodium fluoride is associated with the gray tube.

28. What is the principal distinction between hematology and the blood bank?

A. Hematology analyzes poisons, whereas the blood bank separates serum proteins.

B. Hematology measures drug levels, whereas the blood bank performs antibody testing.

C. Hematology studies formed blood elements, whereas the blood bank prepares blood for transfusion.

D. Hematology cultures pathogens, whereas the blood bank determines antibiotic sensitivity.

Answer: (C)

Explanation

Hematology focuses on the formed elements of blood, while the blood bank collects, stores, and prepares blood for transfusion. Drug analysis, pathogen culture, and poison testing belong to other laboratory functions.

29. During which part of the cardiac cycle is systolic blood pressure produced?

A. When the heart contracts

B. When the heart relaxes

C. When the lungs exchange gases

D. When the arteries stop carrying blood

Answer: (A)

Explanation

Systolic pressure represents the pressure produced by heart contraction. Diastolic pressure represents pressure during heart relaxation, not contraction.

30. Which set of measurements falls within the stated normal ranges for respiration, pulse, and body temperature?

A. 20 breaths per minute, 72 beats per minute, and 98.4°F

B. 13 breaths per minute, 108 beats per minute, and 98.4°F

C. 13 breaths per minute, 72 beats per minute, and 98.4°F

D. 13 breaths per minute, 72 beats per minute, and 100.2°F

Answer: (C)

Explanation

Normal respiration is 12–14 breaths per minute, pulse is 60–100 beats per minute, and temperature is 97.6°F–99.6°F, so all three measurements fit those ranges. The other sets contain a respiration, pulse, or temperature value outside the stated normal range.

31. A patient has a pulse of 112 beats per minute. Which term describes this finding?

A. Normal pulse

B. Tachycardia

C. Diastolic pressure

D. Bradycardia

Answer: (B)

Explanation

Tachycardia is a heart rate above 100 beats per minute, making it the appropriate term for a pulse of 112. Bradycardia refers to a rate below 60 beats per minute.

32. Which action is appropriate as part of first aid for a person in shock?

A. Keep the person lying down with the head lower than the body

B. Remove blankets so the person can cool down rapidly

C. Place the person upright to increase blood flow to the legs

D. Give the person food and drink before contacting emergency services

Answer: (A)

Explanation

First aid for shock includes keeping the victim lying down with the head lower than the body, maintaining the airway, calling for help, keeping the person warm, and controlling known bleeding. Sitting the person upright, giving food or drink, and removing warmth do not follow these emergency-care measures.

33. Which sequence correctly represents the proper order of draw for the listed blood collection tubes?

A. Yellow, blood cultures, light blue, red, red-speckled or marbled, green, lavender, royal blue, grey

B. Blood cultures, yellow, light blue, red, red-speckled or marbled, green, lavender, grey, royal blue

C. Blood cultures, yellow, red, light blue, red-speckled or marbled, green, grey, lavender, royal blue

D. Blood cultures, light blue, yellow, red, green, red-speckled or marbled, grey, lavender, royal blue

Answer: (B)

Explanation

The proper sequence places blood cultures first, followed by yellow, light blue, serum, green, lavender, grey, and royal blue tubes. A common error is placing the grey tube before the lavender tube, but the grey tube follows it.

34. How should an arterial blood gas specimen be handled immediately after collection?

A. It should be warmed before transport after collection.

B. It should be chilled after collection.

C. It should remain at room temperature after collection.

D. It should be protected from light after collection.

Answer: (B)

Explanation

Arterial blood gas specimens require chilling after collection to preserve the sample appropriately. Routine venous specimens do not have this same stated chilling requirement.

35. What is the recommended maximum depth for an infant microcapillary collection?

A. No more than 2.0 mm

B. No more than 5.0 mm

C. No more than 3.5 mm

D. No more than 1.0 cm

Answer: (A)

Explanation

The recommended depth for an infant microcapillary collection should not exceed 2.0 mm. Greater depths increase the risk of penetrating too deeply during collection.