The diagnostic test you should order first is a blood test, check hydration and additional tests.
<h3>What is a lethargic child?</h3>
A lethargic child is prostrate and shows no interest in what is going on around him. Often the lethargic child will not look at the mother or watch as you speak. You may have a fixed, expressionless look and not be aware, apparently, of what is going on around you.
With this information, we can conclude that the diagnostic test you should order first is a blood test, check hydration and additional tests.
Learn more about lethargic child in brainly.com/question/4003067
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