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

Citrate is a key intermediate in the tricarboxylic acid cycle. In urine it forms soluble complexes with cations such as Ca++, Mg++ and Fe++, thus inhibiting urinary crystallisation and stone formation. Low levels of urinary citrate excretion (<1.0 mmol/24 h) may be found in patients with distal renal tubular acidosis, malabsorption syndrome and urinary tract infection.

Clinical Indications

Monitoring therapy for renal stones
Identifying decreased urinary citrate as a risk factor for stone formation
Investigation of renal tubular acidosis

Reference range

See report

Sample & container required Random urine sample in universal container or 24 hour urine collection (acidified optional)
Sample volume Random urine: 8 mL or 24 hour urine collection
Turnaround time Up to 6 weeks

May be done on the same sample as oxalate.
Not currently performed in house; this is a referred test.