A patient can also "pass out" from acidosis, hypoxia, hypercapnia and cardiac issues. I don't think your advice is very sound.
All of which can be somewhat reasonably removed from consideration of being the presenting emergent condition by careful and complete history and physical exam. Which from talking with Linuss himself and his educators is not an area in which he lacks knowledge or is careless.
One does not always need labs to diagnose a serious medical condition.
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