VA-BC Infusion Therapy & Solutions

Question 1

What is the maximum osmolarity threshold above which an IV solution should be administered through a central venous access device rather than a peripheral catheter?

Accepted Answer

900 mOsm/L

Answer

Solutions exceeding 900 mOsm/L are hypertonic enough to damage peripheral veins and must be infused through a central venous access device.

Question 2

Which IV solution is considered isotonic and most closely approximates the osmolarity of human blood (approximately 285–295 mOsm/L)?

Accepted Answer

0.9% Normal Saline

Answer

0.9% Normal Saline has an osmolarity of approximately 308 mOsm/L, making it isotonic and safe for peripheral infusion.

Question 3

When administering total parenteral nutrition (TPN) with an osmolarity greater than 900 mOsm/L, which vascular access device is most appropriate?

Accepted Answer

Central venous catheter

Answer

TPN with high osmolarity requires a central venous catheter to allow dilution in the high-flow superior vena cava and prevent peripheral vein damage.

Question 4

Which of the following IV solutions is classified as hypotonic?

Accepted Answer

0.45% Normal Saline

Answer

0.45% Normal Saline has an osmolarity of approximately 154 mOsm/L, which is below the isotonic range and classified as hypotonic.

Question 5

A nurse is preparing to administer two IV antibiotics simultaneously. What is the primary concern when mixing IV medications in the same line without a compatible flush between them?

Accepted Answer

Drug incompatibility causing precipitation or inactivation

Answer

Mixing incompatible IV medications can cause precipitation, inactivation, or toxic byproducts, reducing therapeutic efficacy and potentially harming the patient.

(VA-BC) Vascular Access Nurse Certification Practice Test

(VA-BC) Vascular Access Nurse Certification Practice Test

VA-BC Infusion Therapy & Solutions