Blood collection tubes fill correctly during venipuncture due to which of the following factors?

The high pressure in the arterial system

The high pressure in the venous system

The positive pressure created by the tourniquet

The negative pressure within the tube

Answer and Explanation

The Correct Answer is D

Choice A reason:
The high pressure in the arterial system is not a factor in the filling of blood collection tubes during venipuncture. Arterial blood is not typically collected using evacuated tubes; these are used for venous blood collection, where the pressure is lower.

Choice B reason:
While the venous system does have pressure that aids in blood flow, it is not the high pressure that causes blood collection tubes to fill. Venous pressure is relatively low compared to arterial pressure, and on its own, it is not sufficient to fill the vacuum tubes used in venipuncture.

Choice C reason:
The positive pressure created by the tourniquet can help engorge the veins, making them easier to access, but it does not directly cause the blood collection tubes to fill. The tourniquet's role is to assist in vein visualization and palpation rather than in the filling of the tube.

Choice D reason:
The negative pressure within the tube is the correct factor that causes blood collection tubes to fill during venipuncture. When the needle punctures the patient's vein and then the tube stopper, the vacuum in the tube pulls blood into it until the vacuum is exhausted or the tube is filled. This is why it is essential not to allow the tube contents to contact the stopper, as backflow into the venous system can cause adverse reactions.

Nursing Test Bank

Quiz #1: RN Exams Pharmacology Exams Quiz #2: RN Exams Medical-Surgical Exams Quiz #3: RN Exams Fundamentals Exams Quiz #4: RN Exams Maternal-Newborn Exams Quiz #5: RN Exams Anatomy and Physiology Exams Quiz #6: RN Exams Obstetrics and Pediatrics Exams Quiz #7: RN Exams Fluid and Electrolytes Exams Quiz #8: RN Exams Community Health Exams Quiz #9: RN Exams Promoting Health across the lifespan Exams Quiz #10: RN Exams Multidimensional care Exams

Get 100+ Naxlex Exit Exams for $79 Try Naxlex NCLEX-RN (14 Day Free-Trial)

Naxlex Comprehensive Predictor Exams

Quiz #1: Naxlex RN Comprehensive online practice 2019 B with NGN Quiz #2: Naxlex RN Comprehensive Predictor 2023 Quiz #3: Naxlex RN Comprehensive Predictor 2023 Exit Exam A Quiz #4: Naxlex HESI Exit LPN Exam Quiz #5: Naxlex PN Comprehensive Predictor PN 2020 Quiz #6: Naxlex VATI PN Comprehensive Predictor 2020 Quiz #8: Naxlex PN Comprehensive Predictor 2023 - Exam 1 Quiz #10: Naxlex HESI PN Exit exam Quiz #11: Naxlex HESI PN EXIT Exam 2

Free Nursing Study Resources

Correct Answer is C

Explanation

Choice A reason:
The nondominant dorsal hand is not typically recommended for dermal specimen collection in toddlers due to the thinness of the skin and the proximity of bones and tendons, which increases the risk of injury.

Choice B reason:
The dominant lateral plantar heel is also not an ideal site for dermal specimen collection in toddlers. The heel is a common site for blood collection in neonates, but as children grow, the skin on the heel thickens, and the risk of hitting bone increases.

Choice C reason:
The nondominant third finger is the recommended site for dermal specimen collection in toddlers over one year of age. The palmar surface of the distal phalanx of the middle or ring finger provides a sufficient area for puncture while minimizing the risk of injury to underlying structures.

Choice D reason:
The dominant antecubital space is not a typical site for dermal specimen collection, especially in toddlers. This area is generally used for venipuncture due to the presence of larger veins suitable for this type of blood collection

A. Axillary B. Median cubital C. Basilic D. Dorsal hand

Correct Answer is D

Explanation

Choice A reason:
The axillary vein is not commonly used for routine venipuncture due to its location in the armpit area, where it is more difficult to access and poses a higher risk of complications.

Choice B reason:
The median cubital vein is often the vein of choice for venipuncture due to its size and accessibility. However, in the case of a patient with bilateral scarring on the forearms, this vein may be compromised, making it a less suitable option.

Choice C reason:
The basilic vein, while also a common site for venipuncture, is located on the inner aspect of the arm and may be affected by the scarring on the patient's forearms. Additionally, it is closer to nerves and arteries, which increases the risk of complications.

Choice D reason:
The dorsal hand veins are a good alternative for venipuncture when the more common sites are not available, such as in the case of a patient with bilateral scarring on the forearms. These veins are usually more superficial and can be accessed with minimal risk of complications.

View Question and Answer

Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.

Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today

Blood collection tubes fill correctly during venipuncture due to which of the following factors?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Which of the following sites is appropriate to prepare for dermal specimen collection on a toddler?

Correct Answer is C

Explanation

A patient has bilateral scarring on their forearms from past burn injuries and needs a venipuncture procedure. Which of the following veins should the phlebotomist use for the venipuncture draw?

Correct Answer is D

Explanation

A phlebotomist is preparing to perform venipuncture on a patient who had a right-sided mastectomy. Which of the following is the correct site to perform the collection?

A phlebotomist is preparing to collect a blood specimen from a patient who has self-reported needle phobia. Which of the following actions should the phlebotomist take?

Which of the following information should the physician's office provide to a phlebotomist for laboratory specimen collection?

A dialysis patient in the ICU has a shunt placement in the right forearm and an IV placed in the left hand. Which of the following options best describes the optimal site for the collection of a CBC?

When using the evacuated tube method, which of the following will result in a failed venipuncture if the needle is at a 45° angle upon insertion?

If a patient's name is not located on the requisition order, which of the following is the next acceptable way to identify the patient in the hospital?

According to the Joint Commission, which of the following should a phlebotomist use as a unique identifier when establishing correct inpatient identification?

After greeting the patient, a phlebotomy technician is preparing to perform a blood draw on a patient in an inpatient facility. Which of the following actions should the technician take next?