The size of the needle used for a biopsy varies depending on the type of biopsy and the tissue being sampled.
Generally, biopsy needles range in size from 14 gauge to 18 gauge. The gauge number indicates the diameter of the needle; a lower gauge number means a larger diameter.
Here's a breakdown of common biopsy needle sizes:
- 14 Gauge (G14): Green color code; needle lengths of 10 cm or 16 cm
- 16 Gauge (G16): Purple color code; needle lengths of 10 cm or 16 cm
- 18 Gauge (G18): Pink color code; needle lengths of 10 cm, 16 cm, 20 cm, or 25 cm
| Size | Colour code | Needle length (cm) |
|---|---|---|
| G 14 | Green | 10, 16 cm |
| G 16 | Purple | 10, 16 cm |
| G 18 | Pink | 10, 16, 20, 25 cm |
The choice of needle size is determined by the physician based on factors such as the location of the biopsy site, the amount of tissue needed, and the patient's condition. Larger needles (e.g., 14 gauge) can obtain larger tissue samples, but may also cause more discomfort or bleeding. Smaller needles (e.g., 18 gauge) are less invasive but may yield smaller samples.
