Techniques for blood collection from the rat include puncture of the heart, retro-orbital plexus ... also be drawn into the syringe or butterfly needle tube. The anticoagulant is then expelled ...

Studies involving ferrets necessitate knowledge of proper blood collection ... remove the needle quickly and allow the ferret to become calm before making any additional collection attempts ...

Furthermore, the location of the needle injection is a tricky area ... and ethical concerns outweigh the practical advantages of the retro-orbital bleeding technique in rodents. Preference has to be ...