For a discussion on calculation formulae, try:
Kruse JA, Cadnapaphornchai P, The serum osmole gap. J Crit Care 1994; 9:
185-97
which gives 20 formulae that have been described (but be careful, as it's a
US paper with mg/L units so factors will need to be changed)
Mike Hallworth
PS - also related to this posting, Sigma Dx have now ceased trading and
their alcohol method is no more.
Mike
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