Laboratory parameters of the 1st order – obligatory laboratory tests.
- Small blood count
- Urine status (rapid test for: pH, leukocytes, nitrite, protein, glucose, ketone, urobilinogen, bilirubin, blood), sediment if necessary.
- Urine volume
- Electrolytes – calcium, potassium
- Fasting glucose (fasting blood sugar)
- Thirst test (two-step test) – diagnostic test designed to rule out diabetes insipidus.
- Blood/urine osmolarity or blood/urine osmolality – to distinguish between osmotic and non-osmotic polyuria [normal finding: 600-900 mosmol].
- ADH (antidiuretic hormone)
- Renal parameters – urea, creatinine, cystatin C or creatinine clearance, as appropriate.