CNT CLEAN NEEDLE TECHNIQUE
COMPREHENSIVE EXAM 1 QUESTIONS
AND VERIFIED SOLUTIONS LATEST
UPDATE THIS YEAR
1. According to Clean Needle Technique (CNT) standards, what is the minimum duration for
vigorous scrubbing with soap and water during handwashing?
A. 10-20 seconds
B. 5-10 seconds
C. 30-45 seconds
D. 60 seconds
Answer: A
Conceptual Explanation: The CCAOM and CDC guidelines recommend at least 10 to 20
seconds of vigorous scrubbing to effectively remove transient microorganisms.
2. How long can the Hepatitis B virus (HBV) survive on environmental surfaces at room
temperature?
A. At least 7 days
B. Up to 48 hours
C. At least 24 hours
,D. Up to 1 month
Answer: A
Conceptual Explanation: HBV is highly resilient and can remain infectious on surfaces for
at least one week, even in dried blood.
3. What is the estimated risk of infection from a single needlestick involving an HIV-positive
patient?
A. 1.80%
B. 0.30%
C. 6-30%
D. 50%
Answer: B
Conceptual Explanation: The average risk of HIV infection after a percutaneous exposure
to HIV-infected blood is approximately 0.3%.
4. Which solution is recommended by OSHA for cleaning up blood spills on non-porous
surfaces?
A. 70% Isopropyl alcohol
B. 1:10 dilution of household bleach
C. 1:100 dilution of household bleach
D. Chlorhexidine gluconate
, Answer: B
Conceptual Explanation: A 1:10 dilution of bleach and water is the standard for cleaning
blood spills to ensure the destruction of bloodborne pathogens like HBV and HIV.
5. At what point should a sharps container be sealed and replaced?
A. When it is 50% full
B. Every 30 days regardless of volume
C. When it is 100% full
D. When it is 75% full
Answer: D
Conceptual Explanation: To prevent overfilling and needlestick injuries, sharps
containers should be replaced when they reach the three-quarters (75%) full mark.
6. Which of the following defines ‘Critical Items’ according to the Spaulding classification
system?
A. Items that contact intact skin only
B. Items that enter sterile tissue or the vascular system
C. Items that contact mucous membranes
D. Environmental surfaces in the treatment room
Answer: B
COMPREHENSIVE EXAM 1 QUESTIONS
AND VERIFIED SOLUTIONS LATEST
UPDATE THIS YEAR
1. According to Clean Needle Technique (CNT) standards, what is the minimum duration for
vigorous scrubbing with soap and water during handwashing?
A. 10-20 seconds
B. 5-10 seconds
C. 30-45 seconds
D. 60 seconds
Answer: A
Conceptual Explanation: The CCAOM and CDC guidelines recommend at least 10 to 20
seconds of vigorous scrubbing to effectively remove transient microorganisms.
2. How long can the Hepatitis B virus (HBV) survive on environmental surfaces at room
temperature?
A. At least 7 days
B. Up to 48 hours
C. At least 24 hours
,D. Up to 1 month
Answer: A
Conceptual Explanation: HBV is highly resilient and can remain infectious on surfaces for
at least one week, even in dried blood.
3. What is the estimated risk of infection from a single needlestick involving an HIV-positive
patient?
A. 1.80%
B. 0.30%
C. 6-30%
D. 50%
Answer: B
Conceptual Explanation: The average risk of HIV infection after a percutaneous exposure
to HIV-infected blood is approximately 0.3%.
4. Which solution is recommended by OSHA for cleaning up blood spills on non-porous
surfaces?
A. 70% Isopropyl alcohol
B. 1:10 dilution of household bleach
C. 1:100 dilution of household bleach
D. Chlorhexidine gluconate
, Answer: B
Conceptual Explanation: A 1:10 dilution of bleach and water is the standard for cleaning
blood spills to ensure the destruction of bloodborne pathogens like HBV and HIV.
5. At what point should a sharps container be sealed and replaced?
A. When it is 50% full
B. Every 30 days regardless of volume
C. When it is 100% full
D. When it is 75% full
Answer: D
Conceptual Explanation: To prevent overfilling and needlestick injuries, sharps
containers should be replaced when they reach the three-quarters (75%) full mark.
6. Which of the following defines ‘Critical Items’ according to the Spaulding classification
system?
A. Items that contact intact skin only
B. Items that enter sterile tissue or the vascular system
C. Items that contact mucous membranes
D. Environmental surfaces in the treatment room
Answer: B
