Assistant Laboratory Animal Technician (ALAT) Practice Exam

Cervical dislocation should only be performed on rats weighing less than what?

1. 100 g

2. 150 g

3. 200 g

4. 250 g

The correct answer is: 200 g

Cervical dislocation is a method often used for euthanasia in smaller laboratory animals, including rats. This technique is based on the principle that it results in rapid unconsciousness and death when performed correctly. The guideline for performing cervical dislocation is that it should only be done on animals that weigh less than a specific limit, primarily because the anatomical and physiological stresses involved in the procedure increase with the size of the animal. For rats, this weight limit is typically around 200 grams. Above this weight, the risks associated with the procedure increase, and alternative euthanasia methods are recommended. This ensures humane treatment and optimal results during the euthanasia process. Choosing a weight limit like 200 grams reflects both ethical considerations and practicality within laboratory settings, allowing for greater assurance of effective and humane euthanasia.