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November 28, 2015

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Posted in Animal Feeding Needle, Gavage Needle Size

Selecting Correct Gavage Needle Size

Choosing the right gavage needle is essential to ensure safe and effective dosing, and it largely depends on the species, weight, and age of the rodent. At GavageNeedle.com, we offer a wide range of high-quality, reusable oral gavage needles to match your lab’s needs.

Here is a document from George Washington university that provides guidelines on gavage needles sizes based on animal weight. Click Here to access the article 

 

Mouse Gavage Needle Sizes 

Weight range (g)

Gauge

Length (inches)

Ball Diameter (mm)

Shape

to 14 gms

24

1"

1 1/4 mm

Straight, Curved

15-20 gms

22

1", 1 1/2"

1 1/4 mm

Straight, Curved

20-25 gms

20

1", 1 1/2",2"

2 1/4 mm

Straight, Curved

25-30 gms

18

1", 1 1/2",2"

2 1/4 mm

Straight, Curved

30-35 gms

18

2", 3"

2 1/4 mm

Straight, Curved 

For mice, smaller gauges are typically preferred:

  • For pups and young mice up to 14g, a 24G gavage needle is ideal.

  • Mice between 15–20g often do well with a 22G needle.

  • For slightly larger mice (20–25g), a 20G needle is recommended.

  • Mice in the 25–35g range may require an 18G needle, especially for viscous compounds or larger doses.

oral gavage needle


Rat Gavage Needle Sizes

Weight (g) of rat

Gauge

Length (in)

Ball Diameter (mm)

Shape

50-75

20

1-1.5

2.25

Straight/Curved

75-100

18

1-1.5

2.25

Curved

100-200

18

2-3

2.25

Curved

200-300

16

3-4

3

Curved

 

For rats, you'll typically use a thicker gauge:

  • Small rats between 50–100g often require a 20G or 18G needle.

  • Rats from 100–200g typically benefit from an 18G needle with added length (2–3").

  • Larger rats (200–300g) may need a 16G needle, especially for higher volumes or thicker solutions.

Always choose the needle length to match the esophageal distance—from the rodent’s mouth to the sternum—to prevent aspiration or injury.

 

 
 
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