What are best practices to avoid contamination when drawing from an IV line?

What are best practices to avoid contamination when drawing from an IV line?

• A. Do not draw from an IV line in use; if unavoidable, pause the infusion, flush per policy, and collect from a different site or use a discard tube to clear the line.
• B. Draw from the IV line while infusion continues.
• C. Use a discard tube but continue drawing from the same line.
• D. Collect from the IV line after disconnecting the infusion.

Answer: (A)

The main idea is preventing IV line contents from contaminating a blood sample. The safest and most reliable approach is to avoid drawing from an IV line that is actively infusing. If you absolutely must draw from that line, pause the infusion and flush the line per policy to clear any IV fluids or medications, then either collect from another, unaffected site or use a discard (waste) tube to push the line contents out before drawing the actual sample. This keeps the sample representative of the patient’s blood rather than being diluted or altered by IV contents. Why this works: IV fluids and drugs can change the concentration of analytes in the sample, leading to inaccurate results. Flushing after pausing the infusion removes residual IV content, and using a discard tube ensures the collected sample is not tainted by what was in the line. Pausing the infusion also prevents backflow or contamination from ongoing IV administration. Continuing to draw with the infusion running increases the risk of dilution or medication carryover, and trying to draw after disconnecting the infusion introduces risks and isn’t a practical or reliable method in most settings.

The main idea is preventing IV line contents from contaminating a blood sample. The safest and most reliable approach is to avoid drawing from an IV line that is actively infusing. If you absolutely must draw from that line, pause the infusion and flush the line per policy to clear any IV fluids or medications, then either collect from another, unaffected site or use a discard (waste) tube to push the line contents out before drawing the actual sample. This keeps the sample representative of the patient’s blood rather than being diluted or altered by IV contents.

Why this works: IV fluids and drugs can change the concentration of analytes in the sample, leading to inaccurate results. Flushing after pausing the infusion removes residual IV content, and using a discard tube ensures the collected sample is not tainted by what was in the line. Pausing the infusion also prevents backflow or contamination from ongoing IV administration.

Continuing to draw with the infusion running increases the risk of dilution or medication carryover, and trying to draw after disconnecting the infusion introduces risks and isn’t a practical or reliable method in most settings.