Final answer:
The total blood volume for an infant weighing 3 kg is estimated to be between 240 to 270 milliliters, calculated using the standard estimate of 80 to 90 ml of blood per kilogram of body weight.
Step-by-step explanation:
The total blood volume for an infant who weighs 3 kg is approximately 240 to 270 milliliters (ml). It's estimated that infants have a blood volume of about 80 to 90 ml/kg of body weight. Given the specific weight of 3 kg for the infant in question, multiplying 3 kg by 80 ml/kg gives a lower estimate of 240 ml, while 3 kg by 90 ml/kg provides an upper estimate of 270 ml.
This range is important for a phlebotomy technician to be aware of in order to avoid taking too large a volume of blood for sampling, which can be dangerous for the infant. Appropriate measures should be taken to ensure the safety and well-being of the patient during the blood draw.