IV cannula

Devices that are inserted through

natural opening 

Devices that are inserted through

unnatural opening 

Number increase, 

diameter increase 

Number increase, 

diameter decrease

Diameter order-

12G < 14G < 16G < 18G 

Diameter order-

12G > 14G > 16G > 18G

1. Ryles tube- in nose / mouth 

2. Suction catheter- in nose / mouth

3. Gudel airway- in mouth

4. Foley catheter- in uretha 

1. IV cannula - in veins




IV Cannula

Color

Gauge

Size

Outer

Diameter (mm)

Flow Rate

(ml/min)

Typical Use

Orange

14 G

2.1

270

Rapid fluid replacement,

emergency use

Grey

16 G

1.8

180

Blood transfusions, surgery

Green

18 G

1.3

90

Blood transfusions, major trauma

Pink

20 G

1.1

60

General use, blood transfusions,

IV fluids

Blue

22 G

0.9

36

IV medications, pediatric use

Yellow

24 G

0.7

20

Neonatal, pediatric, or elderly

patients

Purple

26 G

0.6

13

Neonatal, fragile veins


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