TEXAS NHA PRACTICE EXAM WITH CORRECT ACTUAL QUESTIONS AND CORRECTLY WELL DEFINED ANSWERS LATEST ALREADY GRADED A+

TEXAS NHA PRACTICE EXAM WITH
CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS
LATEST ALREADY GRADED A+



1. What is the primary purpose of a tourniquet in
phlebotomy?


A. Increase blood pressure
B. Prevent clotting
C. Make veins more visible
D. Sterilize the site


Explanation: A tourniquet temporarily restricts venous
blood flow, causing veins to become more prominent for
easier venipuncture.


2. The best site for adult venipuncture is the:


A. Radial artery

,B. Median cubital vein
C. Femoral artery
D. Dorsalis pedis artery


Explanation: The median cubital vein is large, stable, and
least painful.


3. Which color tube is used for coagulation studies?


A. Red
B. Lavender
C. Blue
D. Green


Explanation: Blue-top tubes contain sodium citrate for
clotting studies like PT and PTT.


4. First step before a blood draw is:


A. Apply tourniquet
B. Label tube

,C. Hand hygiene
D. Select needle


Explanation: Hand hygiene prevents infection and cross-
contamination.


5. Which patient position is preferred for venipuncture?


A. Standing
B. Supine
C. Prone
D. Sitting upright only


Explanation: Supine position reduces risk of fainting.


6. Hemolysis in a sample is caused by:


A. Slow draw
B. Excessive shaking
C. Proper mixing
D. Correct needle size

, Explanation: Vigorous shaking destroys RBCs causing
hemolysis.


7. Order of draw prevents:


A. Infection
B. Sample contamination
C. Pain
D. Bruising


Explanation: Proper order prevents additive carryover
between tubes.


8. The antiseptic used before venipuncture is:


A. Alcohol 70%
B. Hydrogen peroxide
C. Saline
D. Betadine only