Intraperitoneal injections are commonly given in which abdominal quadrant in rats?

• A. Left caudal quadrant
• B. Right caudal quadrant
• C. Upper left quadrant
• D. Lower right quadrant

Answer: (A)

Intraperitoneal injections in rats are given in a site that provides access to the peritoneal cavity while minimizing the risk of injuring nearby organs. The left caudal quadrant is the preferred spot because it places the injection away from the stomach and spleen (which are more cranial/left) and away from the liver (which is more cranial and on the right). This area tends to offer safer, more straightforward entry into the peritoneal space and reduces the chance of puncturing the cecum or intestines. When the needle is directed into this lower-left region, fluid can enter the peritoneal cavity reliably with fewer complications. Other abdominal sites lie closer to major organs or bowel, increasing the risk of injury or improper placement.