The maximum amount of blood that can be safely drawn from a child depends on their weight. Generally, it's recommended not to exceed 2.5% of the child's total blood volume at one time1
. For example, for a child weighing 20 kg (about 44 lbs.), this would be around 50mL. Always best to consult with a healthcare professional for specific guidelines.
After discussing the necessary amount with the pediatrician, ensure you coordinate with your phlebotomist to finalize the details of the tests. Determine which tests you and your physician have decided to postpone, and which ones should be included in the minimum volume, particularly if you intend to draw less than the recommended amount.
Tube sizes range from 4ml for CBC tests to 10ml for blood bank uses. Some tests require 2ml of serum, which means a child must provide 4ml of whole blood to obtain the necessary serum volume. However, not everyone yields the same amount of serum.
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