Ask the casualty to support their arm with their other hand. Gently slide the triangular bandage underneath the arm. The point of the triangle should be underneath the elbow of the injured arm. Bring the top end of the bandage around the back of the neck.
How to make an arm sling
Dr Lynn Thomas, OStJ, BSc, MB.BS, MA, FRCPClinically reviewed: 28/04/2025
An arm sling holds the forearm in a raised or horizontal position and can support an injured upper arm, forearm, and wrist. The sling is also a useful visual warning to others that someone is injured.
What to do
- 1
- 2
Fold the lower end of the bandage up over the forearm to meet the top of the bandage at the shoulder of the injured side.
- 3
Tie the two ends of the bandage together in a reef knot above their collar bone and tuck in the free ends.
- 4
Adjust the sling so that it supports their arm all the way to the end of their little finger.
- 5
Make sure that the edge of the bandage by the elbow is secured by twisting the fabric and tucking it in, or using a safety pin to fasten.
- 6
Check the circulation in their fingertips every 10 minutes. Press their nail for five seconds until it turns pale, then release to see if the colour returns within two seconds.
