Imperial Collage Healthcare


Test Background
Electrolytes are usually measured as part of a renal profile, which measures sodium, potassium, creatinine and urea. Serum urea correlates with catabolic states and increases during tissue/organ trauma, while circulating levels are a good indication of a patient’s overall hydration status and/or kidney function.

Clinical Indications
Suspected renal failure Monitoring of patients receiving intravenous fluids Monitoring of established chronic kidney disease

Reference Range
Adult                         2.5-7.8 mmol/L
Less than 1 month    0.8-5.5 mmol/L
1-12 months             1.0-5.5 mmol/L
1-16 years                2.5-6.5 mmol/L
24 hour urine            200-600 mmol/d

Sample Required
SST (gold top)24 hour urine collection

Sample Volume
Blood: 0.5 mLUrine: 24 hour collection

Turnaround Time
Blood: 1 day Urine: 2 days

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