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Free CCMA practice · Updated October 2026

CCMA blood collection tubes and additives practice questions, with every answer explained

Phlebotomy is 12 of the 150 scored items on the NHA CCMA. Answer 10 exam style questions on blood collection tubes and additives and see exactly which concepts would cost you points on test day.

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Where the CCMA points are150 scored items
General patient care
28
Foundational knowledge
15
Infection control and safety
15
Patient intake and vitals
14
Phlebotomy
12
Care coordination and education
12
Administrative assisting
12
Source: NHA CCMA test plan (2022)You are here ↑
Score 0/0
Q1Tube additives

What is the purpose of a clot activator in a red or gold top plastic tube?

What these blood collection tubes and additives questions test

These questions cover tube additives, tube inversions, butterfly collection, capillary collection and specimen handling. Each one shows the correct answer and why every other option is wrong, so a miss tells you exactly what to review before the CCMA.

Tube additivesTube inversionsButterfly collectionCapillary collectionSpecimen handlingPre-analytical errorsSite preparationSpecial patientsSite selectionPatient preparation

All 10 questions with answers explained

Prefer to read first? Every question from the practice set above, with the correct answer and why each wrong option is wrong.

Q1What is the purpose of a clot activator in a red or gold top plastic tube?
  1. To protect from light
  2. To speed up clotting
  3. To prevent clotting
  4. To preserve glucose

Answer: B. Plastic tubes contain a clot activator, such as silica, that helps the blood clot quickly and completely for serum testing.

Why not A: Light protection uses amber tubes.

Why not C: Anticoagulants prevent clotting.

Why not D: Fluoride preserves glucose.

Exam tactic: Clot activator = faster clot.

Q2How many times is a lavender EDTA tube generally inverted after collection?
  1. Once, shaken hard
  2. Never
  3. About 50 times
  4. About 8 to 10 times

Answer: D. EDTA tubes are gently inverted about 8 to 10 times, per the manufacturer's instructions, to mix the anticoagulant and prevent clots. Light blue citrate tubes are typically inverted 3 to 4 times.

Why not A: Vigorous shaking causes hemolysis.

Why not B: Not mixing leads to clots.

Why not C: Excess mixing is unnecessary.

Exam tactic: Gentle inversions; never shake.

Q3When using a butterfly set and a light blue tube is the first tube, why is a discard tube drawn first?
  1. To remove the patient's excess blood
  2. To warm the blood
  3. To test the needle
  4. To fill the tubing dead space

Answer: D. The butterfly tubing contains air. A discard tube fills that dead space so the citrate tube receives the correct blood-to-additive ratio.

Why not A: It is not about removing excess blood.

Why not B: It does not warm blood.

Why not C: It does not test the needle.

Exam tactic: Butterfly + light blue first = discard tube.

Q4For capillary collection, which specimen is generally collected FIRST?
  1. Serum (red) microtube
  2. Lavender EDTA microtube
  3. Green heparin microtube
  4. Blood culture bottle

Answer: B. Among these specimens, the EDTA hematology microtube is collected first to reduce platelet clumping as the puncture begins to clot. When capillary blood gases are ordered, they come before EDTA. Follow the facility's procedure.

Why not A: Serum tubes are collected last in capillary order.

Why not C: Other anticoagulated tubes follow the EDTA tube.

Why not D: Blood cultures are not collected by fingerstick.

Exam tactic: Capillary: lavender first.

Q5How should a specimen for an ammonia level typically be transported?
  1. Protected from light only
  2. On ice, promptly to the lab
  3. Left at room temperature for hours
  4. At body temperature

Answer: B. Ammonia levels rise in the tube as cells metabolize, so specimens are commonly chilled in an ice slurry and delivered promptly. Follow the laboratory's requirements.

Why not A: Light protection is for bilirubin.

Why not C: Delays cause falsely high results.

Why not D: Body temperature is for cold agglutinins.

Exam tactic: Ammonia = ice.

Q6What can happen if the tourniquet is left on longer than about 1 minute?
  1. More accurate test results
  2. Hemoconcentration and false results
  3. Lower chance of a hematoma
  4. Faster clotting of the tube

Answer: B. Prolonged tourniquet time causes hemoconcentration, which can falsely raise values such as proteins, cells, and some analytes.

Why not A: Accuracy decreases.

Why not C: It does not prevent hematoma.

Why not D: Tube clotting is not the issue.

Exam tactic: Tourniquet: 1 minute max.

Q7Why should the alcohol dry before the needle is inserted?
  1. Wet alcohol can hemolyze the specimen and sting
  2. Alcohol only works while wet
  3. It makes the vein larger
  4. It prevents the patient from moving

Answer: A. Allowing 70% isopropyl alcohol to air dry improves antisepsis and avoids hemolysis and a stinging sensation.

Why not B: Alcohol continues to work as it dries.

Why not C: Drying does not enlarge the vein.

Why not D: It does not affect movement.

Exam tactic: Let it air dry.

Q8A patient on an anticoagulant has just had blood drawn. What should the medical assistant do?
  1. Have the patient bend the arm up
  2. Apply the bandage immediately and leave
  3. Apply no pressure at all
  4. Apply pressure longer until bleeding stops

Answer: D. Patients on anticoagulants may bleed longer, so pressure is held until bleeding stops before bandaging.

Why not A: Bending the arm can promote hematoma.

Why not B: Bleeding should be stopped before leaving.

Why not C: Pressure is needed to stop bleeding.

Exam tactic: Blood thinner = longer pressure.

Q9Why is the palm side of the wrist avoided for venipuncture?
  1. It always gives hemolyzed samples
  2. It is too easy to access
  3. The veins are too large
  4. Nerves and tendons lie close to the surface

Answer: D. The palmar side of the wrist has nerves and tendons near the surface, increasing the risk of injury.

Why not A: Hemolysis is not the reason.

Why not B: Ease of access is not the concern.

Why not C: Veins there are small, not large.

Exam tactic: Avoid the inner wrist.

Q10What is meant by a patient's 'basal state' before blood collection?
  1. Rested and fasting, early morning
  2. Right after a hard workout
  3. Shortly after a large meal
  4. During an active fever

Answer: A. The basal state is the body's resting state after fasting overnight, usually in the early morning. Reference ranges for many tests are based on it.

Why not B: Exercise changes many values.

Why not C: Meals change many values.

Why not D: Fever changes many values.

Exam tactic: Basal = rested and fasting.

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More about the CCMA

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These practice questions are written by PassPulse to reflect the published exam content outline. They are not actual exam questions. Questions, answers and explanations may contain errors or be out of date, and they are for exam study only, not for clinical or professional practice: always check facts against the certifying body's official materials, current standards and your employer's policies. Scores and projections on this page are estimates based on a small number of questions and do not predict your result on the real exam. Area weights come from the official outline as of the date shown; always confirm current exam details with the certifying body.
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