Laboratory parameters of 1st order – obligatory laboratory tests.
- Small blood count
- Electrolytes – potassium, magnesium, sodium [hypernatremia: > 145 mmol/l].
- Total serum protein (serum protein; serum protein).
- Serum osmolality
Laboratory parameters 2nd order – depending on the results of the history, physical examination, etc. – for differential diagnostic clarification.
- Inflammatory parameters – CRP (C-reactive protein).
- Urine status (rapid test for: pH, leukocytes, nitrite, protein, glucose, ketone, urobilinogen, bilirubin, blood), sediment.
- Renal parameters – urea, creatinine, cystatin C or creatinine clearance if necessary.
- Pancreatic parameters – amylase, elastase (in serum and stool), lipase.
| Parameter | Hypovolemic hypernatremia (= hypertonic dehydration). | Hypervolemic hypernatremia (= hypertonic hyperhydration) |
| Sodium (Na) | ↑ | ↑ |
| Total protein in serum (serum protein; serum protein). | ↑ | ↓ |
| Hemoglobin (Hb) | ↑ | ↓ |
| Hematocrit(Hk) | ↑ | ↓ |
| Mean single red cell volume(MCV) | ↓ | ↓ |
| Serum osmolality | > 296 mosmol/kg H2O | > 296 mosmol/kg H2O |
| Specific urine weight | ↑ |
