What size needle should be used for blood sampling in cats and dogs?

What size needle should be used for blood sampling in cats and dogs?

• A. 18G
• B. 21G
• C. 23G
• D. 25G

Answer: (B)

Selecting a needle size for venipuncture in cats and dogs is all about balancing adequate blood flow with minimizing tissue trauma. A mid-range gauge, around 21, provides reliable flow for routine blood collection without causing excessive vein trauma or pain. An 18G needle is larger and can increase tissue injury and bruising, while a 23G or 25G needle is smaller and can slow the draw, raise the chance of vein collapse, or lead to hemolysis if the sample is drawn too slowly. So, 21G is the practical, widely used choice for efficient, comfortable blood sampling in these patients, with adjustments only if a particularly tiny or fragile vein is encountered.

Selecting a needle size for venipuncture in cats and dogs is all about balancing adequate blood flow with minimizing tissue trauma. A mid-range gauge, around 21, provides reliable flow for routine blood collection without causing excessive vein trauma or pain. An 18G needle is larger and can increase tissue injury and bruising, while a 23G or 25G needle is smaller and can slow the draw, raise the chance of vein collapse, or lead to hemolysis if the sample is drawn too slowly. So, 21G is the practical, widely used choice for efficient, comfortable blood sampling in these patients, with adjustments only if a particularly tiny or fragile vein is encountered.