gauge needle

What Is A 14 Gauge Needle Used For? 14 GAUGE (Orange): A 14 gauge needle is usually used to rapidly infuse fluids or blood during surgery or trauma. How big is a 14 gauge needle? Gauge Number Needle Nominal O.D. (mm) Needle Dead Volume (μL/25.4 mm) 16 gauge needle 1.651 28.444 μL/25.4 mm 15 gauge