A canine is brought to a veterinary clinic presenting with symptoms of persistent polydipsia (excessive drinking) and polyuria (excessive urination).
A urinalysis is performed, and the results are shown in the table below:
| Parameter | Patient value | Normal reference range |
|---|---|---|
| Glucose | 140 mg/dL | Negative (undetectable) |
| Protein (Albumin) | 15 mg/g | Less than 30 mg/g |
| Specific Gravity | 1.015 | 1.015 to 1.045 |
| pH | 6.5 | 5.5 to 7.5 |
After reviewing these results, the veterinarian advised the owner that the canine should undergo a blood test to check for diabetes mellitus.
Based on the data in the table, give one reason why the veterinarian came to this conclusion.