The largest commonly used needle in a syringe is a 21G needle.
Understanding Needle Sizes (Gauge)
Needle size is indicated by its gauge (G) number. The larger the gauge number, the smaller the needle. Therefore, a 21G needle is larger than a 25G needle.
21G Needle Details
- Size: 21G (largest commonly used)
- Length: 50mm (2 inch)
- Color Code: Green
- Packaging: Individually blister packed and sterile
- Common Use: Intramuscular injections, particularly for thicker or non-water-based medications. According to BBraun documentation, the 21G needle is well-suited for intramuscular injections.
Common Needle Sizes and Uses: A Quick Reference
| Gauge | Common Use | Example Medications |
|---|---|---|
| 21G | Intramuscular injections | Oil-based medications, some vaccines |
| 22G | Intramuscular injections, IV use | General injections, some blood draws |
| 23G | Subcutaneous or Intramuscular | Flu vaccines, some pain medications |
| 25G | Subcutaneous injections | Insulin, allergy shots |
| 27G | Intradermal injections | TB tests |
