The technique of blood collection from the lateral caudal vein has been improved. The method requires only moderate skill and no anaesthesia is necessary. Collection of blood samples causes little trauma and can be repeated at frequent (8 h) intervals thus making the method particularly suitable for pharmacokinetic and hormonal studies. Blood samples are uncontaminated by tissue fluids. Large volumes can be obtained, in mice up to 1.5 ml and in Wistar rats over 4 ml.
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