Bruising or discoloration, Cold feet, Cold hands and Fatigue. WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms bruising or discoloration, cold feet, cold hands and fatigue including Bruise or contusion, Raynaud phenomenon, and Hematoma.
The approximate blood volume of a rat is 55-70 ml/kg of body weight. For a 300 g rat this is equivalent to 17-21 ml (5). Single sample: Without fluid replacement, the maximum blood volume which can be safely removed for a one time sample is 10% of the total blood volume or 5.5-7 ml/kg.
The amount of blood in an adult human is relatively constant: Around 4.7 litres, with of total weight of ~4.4 Kg (average density of blood: ~1.06). Perhaps slightly more (~5 litres?). And slightly less in women. So the percentage of total body weight varies, depending of total body weight. More information and details here: Volume of Blood in a Human