The patient's plasma or urine should be checked for ketones and if greater than 2+ the arterial pH should also be measured.
Based on these findings and the clinical findings of the patient then they can be classified either as:
dehydration  | glucose mmol/l  | ketones  | pHa  | drowsiness  | |
DM*  | -/+  | >11  | - to ++  | 7.4  | -  | 
DKA  | ++  | > 15  | +++  | <7.2  | ++  | 
HONK  | ++++  | >30  | +  | >7.2  | +++  | 
DM* newly diagnosed or poorly controlled diabetic
adapted from: D Sprigings Acute Medicine Blackwell 1992
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