Phosphorus
                        ==========

þ A respiratory alkalosis is one of the most common causes of
  hypophosphatemia.
  I once had a patient who had a "critical" level of 0.7 -- all due to 
  hyperventilation (from anxiety from an episode of transient global amnesia) as 
  when we rechecked it an hour later, after he had stopped hyperventilating 
  and it was 2.9 (normal) Aaron Parrish 970289130 6/7/09 UPMC Mercy ED.VBG 
  during hyperventilation shows pH 7.64 pCO2 21
  [emedicine.com - http://www.emedicine.com/emerg/topic278.htm.]