My eGFR is 59: Do I Have Chronic Kidney Disease (CKD)?

My eGFR is 59: Do I have CKD?

Yes/no. You may have. But it depends. We will explain.

1. What a GFR Level of 59 Means

• The Diagnostic Threshold: Yes. A GFR (Glomerular Filtration Rate) or eGFR result of 59 $mL/min/1.73m^2$ is the exact entry point used to define stage 3 chronic kidney disease (CKD).

• The Five Diagnostic Stages: Medical guidelines categorise kidney filtration efficiency into distinct brackets based on the GFR score:

  • Stage 1 & 2 (Normal or Mild): 60 or above (with other signs of kidney damage)

  • Stage 3 (Mild to Moderate): 30 to 59

  • Stage 4 (Severe): 15 to 29

  • Stage 5 (Kidney Failure): Below 15

• An Estimate of Filtration: Rather than measuring the physical structure of the kidneys, the eGFR test calculates how effectively your kidneys filter waste products from your blood, based on a simple blood test.

2. Confirming Your Diagnosis (the ‘But’)

• The 3-Month Rule (‘but’): A single GFR reading of 59 does not automatically mean you have CKD. To meet the formal medical definition of chronic kidney disease, your GFR must remain below 60 on repeated tests for at least 3 months.

• Without Symptoms: Early-stage CKD (like a GFR of 59) rarely causes any symptoms. Because readings can fluctuate due to minor day-to-day factors, clinical guidelines require a second, confirmatory blood test to rule out temporary drops before a formal diagnosis is made.

3. Non-Kidney Factors That Can Affect the Result

• Dehydration: If you did not drink enough fluids before your blood test, your blood volume drops temporarily. This reduces blood flow to the kidneys and can cause a transient, false dip in your GFR reading.

• Diet and Supplements: Eating a large amount of cooked red meat or taking creatine supplements shortly before your test increases the waste products in your blood, artificially lowering your calculated GFR.

• Medications: Commonly used drugs, such as NSAID painkillers (like ibuprofen) or certain blood pressure medications, can cause temporary fluctuations in kidney filtration pressures during a test.

4. Immediate Lifestyle Next Steps

• Blood Pressure Control: Keep your blood pressure tightly managed. High blood pressure strains the delicate filtering units in the kidneys, so aiming for target levels is the single most important protective step.

• Review Medications: Work with a professional to review your prescription and over-the-counter medicines. Avoid regular use of NSAIDs (like ibuprofen), which can cause further stress to kidney filtration. In some patients blood pressure tablets called ACEs (‘prils’) and ARBs (‘sartans’) will need to be stopped.

• Cardiovascular Health: Focus on a heart-healthy diet low in ultra-processed foods and engage in regular exercise. What is good for your heart and blood vessels directly protects your kidney function.

5. Opportunity for Kidney Protection

• Catching it Early: Because 59 is at the absolute baseline of the stage 3 range, your kidneys are still functioning at a highly effective level, leaving you in an excellent position to protect them.

• Avoiding Progression: Being at the entry threshold means that with proactive management, you can focus on preventing further decline, keeping your kidney function stable for many years or even decades.

• Preserving Function: Many individuals who manage their blood pressure, adjust their lifestyle, and review their medications successfully stabilize their numbers, ensuring their kidneys continue to do their job safely without ever needing intensive specialist treatment.

Note: A GFR result of 59 requires a formal review with your GP surgery or healthcare team to establish a tailored management plan, review urine tests for protein, and organise any necessary follow-up testing.