What does it measure?
Your kidneys filter glucose, then usually return it to the blood. Sugar may appear in urine if blood glucose exceeds what the kidneys can reclaim, or if the kidneys release glucose more easily. A urine test is not a substitute for a blood glucose or HbA1c test.
Before the test
- Sample
- Collect urine in the laboratory’s container, following its clean-catch instructions.
- Medicines
- List medicines and supplements; they can affect either glucose excretion or the test reading.
What can the result mean?
A positive result can occur with high blood sugar, pregnancy, certain kidney conditions, or medicines designed to pass glucose into urine. A negative result does not rule out diabetes or tell us the current blood sugar level. [1]
When is it useful, and how is it read?
For possible diabetes, read urine glucose with blood glucose and HbA1c. For someone taking an SGLT2 medicine, the same positive urine result may reflect the medicine’s intended action rather than treatment failure. [1]
What can affect it?
SGLT2 medicines intentionally increase urine glucose. The time since a meal, the collection time, and some test-strip interferences also matter. Tell your clinician which medicines and supplements you take. [1]
Myth: «Sugar in urine always means uncontrolled diabetes»
Some diabetes and kidney medicines deliberately send glucose into urine. Pregnancy and differences in kidney handling can also explain a positive result, so blood tests and medicines matter. [1]
Questions you might have
Can urine glucose replace a blood glucose test?
No. Blood testing is more suitable for diagnosing and monitoring diabetes. [1]
Does negative urine glucose rule out diabetes?
No. Blood glucose can be raised even when little or no glucose appears in urine. [1]
What comes next?
If the result is unexpected, review blood glucose and HbA1c with your clinician. If urine glucose is expected from your prescribed treatment, the aim is to assess the whole treatment picture rather than remove that finding. [1]
Is this glucose expected from my medicine, or should we check my blood sugar and kidney handling?
The reference interval and units on your report are part of understanding your result. Understand units, reference intervals, and treatment targets.
Sources & references
Medical references & original research
Books we consulted
References that informed our explanations of the test and its context.
- Pagana KD, Pagana TJ, Pagana TN. Mosby’s Diagnostic and Laboratory Test Reference. 14th ed. Elsevier; 2019.
Practical-section sources accessed: .
For general health education. Interpreting your result and deciding on tests or treatment requires your health context and a qualified clinician.
