Based on the provided reference (specifically referencing the YouTube video "How to take blood with an intravenous cannula" by ABCs of Anaesthesia), blood can be drawn from an intravenous cannula (IV) using a specific technique. Here's a breakdown, based on the video excerpt, focusing on insertion (note: this isn't the entire procedure but addresses initial steps mentioned):
- Distal Approach: Begin distally (away from the insertion point of the cannula).
- Low Angle Insertion: Use a low angle of insertion when inserting the needle/collection device.
- Flashback: Look for a "flash," indicating successful entry into the vessel.
- Level Out and Advance: After seeing the flash, level out the angle of the needle and advance a few millimeters further.
- Blood Flow: You should observe a good flow of blood.
Important Considerations:
The provided excerpt only covers a small portion of the complete blood draw procedure. A safe and proper blood draw from a cannula includes several additional steps and considerations:
- Preparation: Gather necessary supplies (gloves, alcohol swabs, blood collection tubes, adapter, tourniquet (if necessary), gauze, tape/dressing).
- Site Cleaning: Thoroughly clean the cannula insertion site with an alcohol swab.
- Cannula Assessment: Ensure the cannula is patent (flowing freely) to avoid inaccurate results.
- Blood Collection: Attach the appropriate adapter and blood collection tubes to the cannula.
- Order of Draw: Follow the correct order of draw for blood collection tubes to prevent contamination of samples.
- Flushing: After blood collection, flush the cannula with saline to maintain patency.
- Dressing: Apply a clean dressing to the insertion site.
Disclaimer: This information is for informational purposes only and should not be considered medical advice. Blood draws should only be performed by trained and qualified healthcare professionals. Consult appropriate medical resources and training materials for complete and accurate instructions.
