• Monday - Friday
    9am – 6pm
  • Saturday - Sunday
    10am – 2pm


Checking the urine sodium levels can help explain abnormal blood sodium (natremia). It also aids the investigation and treatment of some kidney problems. The result of a urine specimen is expressed in millimoles of sodium per litre (mmol/L) and millimoles per day (mmol/d) for urine sample collection in 24 hours. We interpret urine sodium levels alongside blood sodium levels.

The body usually excretes excess sodium through the urine. When the urine sodium level is high with a normal or high blood sodium level, it may indicate excess sodium in your diet.

 A high sodium level in urine with a low normal or extremely low sodium level may mean the body is losing excess sodium. Low urine and blood sodium levels may indicate insufficient dietary intake of sodium.

Low sodium levels in the urine may also indicate dehydration (insufficient water in the body), liver disease, kidney disease (nephrotic syndrome) or heart failure. High urine sodium levels can occur from adrenal insufficiency (Addison’s disease) or the use of a diuretic medication.

You can undergo urine and blood sodium levels tests at Private Blood Tests London. Call us today on 02071830244 to schedule an appointment or visit us at Suite E, 117a Harley St, Marylebone, London, W1G 6AT, for sodium level testing.