Which components comprise an intravenous (IV) system?

• A. Sterile fluid source, IV bag, needle, and syringe
• B. Infusion pump, reservoir, filter, and needle
• C. Sterile saline bottle, needleless connector, pump, and line
• D. Sterile fluid source, pump, clamp, and catheter

Answer: (D)

An IV system is a sterile pathway from the fluid source to the bloodstream, designed to deliver fluids safely and at the prescribed rate. The essential components are a sterile fluid source (the IV solution), a means to deliver that fluid (such as a pump), a device to regulate flow (a clamp or flow regulator), and the conduit into the vein (an IV catheter). Together, these parts create the complete delivery circuit from bottle or bag to patient.

Why this set fits best: the sterile fluid source ensures the solution is safe for infusion, the pump provides controlled delivery (or gravity can do so in simpler setups), the clamp allows adjustment of flow rate, and the catheter is the actual access point into the venous system. Other options include items used for establishing access or ancillary parts not central to the continuous delivery circuit (like syringes or needles for initial access, or components like filters or reservoirs that aren’t core to the basic IV delivery pathway).