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NHA Phlebotomy CPT Exam 2026 | Order of Draw & Additives – 35 Practice Questions with Answers & Explanations

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Course CPT - Certified Phlebotomy Technician
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Struggling to remember the correct order of draw and tube additives? This is one of the most tested and most commonly missed topics in the NHA CPT exam — and this practice test is designed to fix that. This resource includes 35 targeted practice questions focused specifically on order of draw, tube colors, and additives, helping you master this critical topic with confidence. What You’ll Get: - 35 exam-style practice questions - Clear answer explanations for every question - Focus on commonly tested mistakes & tricky areas - Fast revision format for quick learning Topics Covered: - Correct Order of Draw (CLSI guidelines) - Tube Color Identification - Additives & Their Functions (EDTA, Heparin, Citrate, etc.) - Preventing Specimen Contamination - Common Exam Mistakes & Confusing Questions Why This Matters: Order of draw questions are almost guaranteed to appear on the NHA CPT exam. Many students lose easy marks due to confusion between tube colors and additives. This practice test helps you: - Memorize faster using repetition - Avoid common exam traps - Build confidence before test day If you master this section, you significantly increase your chances of passing the exam.

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Phlebotomy CPT 2026 Exam | Order of Draw and
Additives Test | 35 Answered Questions

Question 1
Drawing a lavender tube before a light blue may result in what?
A diluted sample
B. Elevated glucose
C. Coagulation error
D hemoglobin concentration.
Answer C.
EVTA from the lavender tube can contaminate and distort coag test results.


Question 2
A green top is collected after which tube in the standard order?
A. Lavender
B. Red
C light blue
D gray.
Answer B.
Green comes after red to avoid additive interference.


Question 3
Which tube contains no anti-coagulant and is drawn after the coagulation tube?
A. Lavender.
B. Green.
C red.
D gray.
Answer C.
Red top has no anti-coagulant and is drawn after light blue.


Question 4
Incorrect additive ratio due to underfilling a light blue tube affects the switch test?

, A CBC
B point
C glucose
D bun.
Answer B.
Coagulation studies like PT rely on precise citrate blood ratios.


Question 5
What color tube is suitable for stat potassium testing?
A red
B light blue
C green
D lavender
Answer C.
Heptonized green tube is used for fast electrolyte analysis.


Question 6
Which statement about SST tubes is true?
A. They contain heparin.
B they are used for plasma.
C they separate serum after clotting.
D they preserve whole blood.
Answer C.
SST tiger top contains clot activator and gel for serum separation.


Question 7
Which tube follows the SST in the draw order?
A. Lavender.
B. Light blue.
C. Green.
D. Gray.
Answer: C.
Green comes after serum tubes in the CLSI order of draw.

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