Certified Registered Nurse Infusion (CRNI) Practice Exam

The primary function of a blood filter in infusion practices is to protect the lungs from microaggregates. During blood transfusions, small particles such as aggregates of red blood cells, platelets, or other debris can form. If these microaggregates enter the pulmonary circulation, they can cause adverse effects including respiratory distress and potential harm to lung tissue. Blood filters are designed to trap these small particles before the blood enters the patient's bloodstream, thereby reducing the risk of pulmonary complications and improving patient safety during transfusion procedures. The other options do not accurately reflect the primary role of blood filters. Enhancing the taste of medications is not a function of blood filters; rather, medical professionals are typically concerned with the therapeutic efficacy and safety of the medications being administered. Ensuring a consistent flow rate and maintaining pressure in the line can be important for intravenous therapy, but these are typically managed by other means, such as using appropriate IV tubing and pumps, rather than through the action of the blood filter itself.