Skip to main content

Login to North West London Pathology – consumables service

If you need a new account or you have a query about your order, please telephone the pathology call centre on 0203 313 5353.

If you have forgotten your password you can reset this yourself. Please click here if you have forgotten your password.

Results Line and Enquiries

0203 313 5353


Category Biochemistry
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
1-16 years 2.5-6.5 mmol/L
1-12 months 1.0-5.5 mmol/L
Less than 1 month 0.8-5.5 mmol/L
24 hour urine 200-600 mmol/d


Sample & container required SST (gold top) 24 hour urine collection
Sample volume Blood: 0.5 mL. Urine: 24 hour collection
Turnaround time Blood: 1 day. Urine: 2 days