What is the primary reason that blood collection for a child should be kept as calm and comfortable as possible?

Question

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Prolonged crying can cause stress on a child's body and lead to changes in blood chemistry, including white blood cell counts and pH levels. Therefore, it is important to keep blood collection as calm and comfortable as possible for children to avoid these changes. Options A and B are less significant reasons compared to the potential impact on the child's health, while option C is not relevant to the situation at hand.

What Is the Primary Reason That Blood Collection for a Child