A diabetic patient, who had

been frequently omitting his insulin injections in the previous two weeks

because of pressure at work and irregular meals, arrives at the Emergency

Department complaining of polyuria. He is noted to be hyperventilating. Arterial

blood gases show that the plasma pH is 7.15. The doctor diagnoses metabolic

acidosis. A urine sample is taken for tests.

Which of the following

findings is also expected?