Kidney Function Test

Kidney Function Test (Renal Function Test)

A kidney function test measures the level of electrolytes and urea in the blood. It is a routine test done to monitor the balance of electrolytes in the blood, and it is also an indicator of renal function. This test determines the integrity of the kidney by measuring the molecules and elements that are filtered into the urine by the kidney. 

A kidney function test costs £64, and the result is usually available within 4 – 6 hours. The parameters measured in a kidney function test includes

  • Sodium (Na+)
  • Potassium (K+)
  • Chloride (Cl-)
  • Bicarbonate (HCO3-)
  • Urea
  • Creatinine

Kidney Function test – £64 – available within 4-6 hours

The level of urea and creatinine in the blood can be used to diagnose short and long term renal failure, respectively. High level of urea indicates acute renal disease while a high level of creatinine indicates chronic renal disease.

High level of potassium on the blood is a risk factor for heart attacks. People with high blood pressure, diabetes or a family history of kidney diseases need to perform this test routinely because these are all high-risk factors for renal failure.

The table below shows the recommended range of these kidney function parameters.

Parameter Measurement range
Sodium mmol/L 135 – 145
Potassium mmol/L 3.5 – 5.1
Chloride mmol/L 98 – 107
Bicarbonate mmol/L 22 – 29
Urea mmol/L 1.7 – 8.3
Creatinine umol/L 66 – 112

These kidney function test parameters must remain within range in a healthy person.

Kidney function test can also serve as a monitoring tool for those on long-term medication to ensure that the medication given to them is not causing any harm to the kidney. Monitored medications include

  • Uric acid
  • Blood pressure medications and ACE-inhibitors
  • Thiazide diuretics

You can perform this test as part of a General Wellness Check at London GP Clinic. Visit our clinic today for your kidney function test or reach us on 020 70434318 to schedule an appointment today.