Question 1

A nurse is preparing to draw blood from an older adult client using a butterfly safety needle. Which is the best angle for needle insertion during venipuncture?

Accepted Answer

The best angle for needle insertion during venipuncture, especially when using a butterfly safety needle, is approximately 15 degrees. This shallow angle helps in accessing the vein without going through it or causing unnecessary discomfort to the patient.

Question 2

A nurse is preparing to obtain a blood sample from an infant. Which precautions should the nurse take when obtaining blood from a capillary puncture in an infant?

Accepted Answer

A) The recommended depth for a capillary puncture in infants is not to exceed 2.0 mm to avoid bone injury. B) Puncturing over bruised areas can contaminate the sample with tissue fluids or cause unnecessary pain. C) The plantar surface of the heel is the preferred site for capillary blood collection in infants to minimize the risk of injury and infection. D) The back of the heel is not recommended due to the higher risk of hitting bone or causing unnecessary pain.

Question 3

A quality-control nurse reviews procedures to decrease the incidence of errors in a hospital laboratory. Which type of test requisition has been shown to decrease laboratory errors?

Accepted Answer

Bar coded test requisitions have been shown to decrease laboratory errors as they allow for accurate tracking and identification of patient samples, reducing the risk of mislabeling or misidentification of specimens. Computer requisitions also offer similar benefits. Manual triplicate forms and verbal requests are more prone to errors and miscommunication.

Question 4

A physician orders multiple blood tests for a client. A nurse preparing to collect blood samples knows that most diagnostic blood tests require:

Accepted Answer

Most diagnostic blood tests require serum, which is the liquid portion of the blood that remains after coagulation. Plasma refers to the liquid portion of the blood that has not coagulated and still contains clotting factors, so it is not typically used for diagnostic tests. Whole blood includes both the liquid and cellular components of the blood, which may not be necessary for certain tests. Red blood cells are typically not used for diagnostic blood tests, as they do not contain many of the substances that are often used for analysis.

Question 5

A clinic nurse is performing venipuncture on multiple clients. Which complications of venipuncture (for venous sampling) should the nurse anticipate?

Accepted Answer

A: Syncope (fainting) can occur as a result of anxiety or stress related to the venipuncture procedure.
B: Continued bleeding can occur if the needle punctures an artery or if the patient has a bleeding disorder.
C: Thrombosis (clotting of blood) can occur if the needle damages the wall of the vein or if the patient has a clotting disorder.
D: Septic shock is a rare complication of venipuncture and is caused by infection. It can occur if the needle is contaminated or if the procedure is not performed in a sterile manner. However, this is not a common complication of routine venipuncture.

Quiz 7: Phlebotomy Techniques

A nurse is preparing to draw blood from an older adult client using a butterfly safety needle. Which is the best angle for needle insertion during venipuncture?

A nurse is preparing to obtain a blood sample from an infant. Which precautions should the nurse take when obtaining blood from a capillary puncture in an infant?

A quality-control nurse reviews procedures to decrease the incidence of errors in a hospital laboratory. Which type of test requisition has been shown to decrease laboratory errors?

A physician orders multiple blood tests for a client. A nurse preparing to collect blood samples knows that most diagnostic blood tests require:

A clinic nurse is performing venipuncture on multiple clients. Which complications of venipuncture (for venous sampling) should the nurse anticipate?