Answer
Ultrasound can locate deeper or non-visible veins, guide the injection and help avoid injection outside the vein or into an artery.
Sources for this answer
- Fibrovein 3%, 1%, 0.5%, 0.2% — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.