What is a 'mixed disorder'?
two or more primary acid-base disturbances
eg anion gap acidosis + non-anion gap acidosis at the same time
Clues that a mixed disorder exists:
The anion gap should be similar in value to the reduction in bicarbonate
An anion gap is present but the pH is alkalaemic
Incomplete compensation for any primary process.
Reminder, “complete (ie full) compensation” does not result in a normal pH, but it gets close