How Often Should GFR Be Monitored in CKD?

How Often Should GFR Be Monitored in CKD?

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Monitoring kidney function is a key part of managing chronic kidney disease (CKD).

One of the most important markers is GFR (glomerular filtration rate), which is calculated from a blood test called creatinine.

How often GFR should be checked depends on the stage of CKD and how stable kidney function is over time. Regular testing helps detect progression early and guides treatment decisions.

Recommended GFR Monitoring Frequency by CKD Stage

General guidance for adults with CKD:

How Often Should You Get Labs?

• No CKD, with risk factors: Annually
• CKD Stage 1-2: Every 6-12 months
• CKD Stage 3: Every 3-6 months
• CKD Stage 4: Every 2-3 months
• CKD Stage 5 (or predialysis): Monthly or as directed

Important: GFR is not used to monitor kidney function in people who are on dialysis or who have a functioning kidney transplant.

What Is GFR and Why Is It Important?

GFR (estimated glomerular filtration rate, or eGFR) measures how well your kidneys filter waste from the blood. A higher GFR indicates better kidney function.

• Normal GFR in adults is approximately 90–120 mL/min
• GFR is calculated using the blood creatinine level
• Lower creatinine generally means a higher GFR

Creatinine is a waste product measured in a simple blood test:

• Typical reference range: 60–120 µmol/L (may vary by lab)

CKD Stages Explained

Chronic kidney disease is divided into five stages based on GFR:

• CKD Stages 1–2
  • GFR ≥60 mL/min with evidence of kidney damage
  • Kidney function may be normal and symptoms are usually absent
• CKD Stage 3
  • GFR 30–59 mL/min (mild to moderate CKD)
  • Usually no symptoms or only mild ones
• CKD Stage 4
  • GFR 15–29 mL/min (advanced CKD)
  • Symptoms become more noticeable
• CKD Stage 5
  • GFR <15 mL/min (kidney failure)
  • Dialysis or kidney transplant is usually required

Monitoring Schedule in More Detail

CKD Stages 1–2

• Creatinine typically within normal range
• GFR / creatinine: every 12 months

CKD Stage 3A

• Creatinine usually normal or mildly raised (often <150 µmol/L)
• GFR / creatinine: every 6 months

CKD Stage 3B

• Creatinine often 150–200 µmol/L
• GFR / creatinine: every 4–6 months
• Urine ACR (albumin-creatinine ratio): every 6 months if protein in the urine is present

CKD Stage 4

• Creatinine commonly 200–400 µmol/L
• GFR / creatinine: every 2–4 months
• Urine ACR: every 4 months if required

CKD Stage 5 (Not on Dialysis)

• Creatinine often >400 µmol/L
• GFR / creatinine: every 1–2 months

Once dialysis has started and kidney function is stable, blood monitoring is often reduced to every 3 months.

Other Important Tests to Monitor in CKD

Managing CKD involves more than GFR alone. Key areas to review include:

Blood Pressure

• Target: <130/80 mmHg
• <120/70 mmHg, if you have diabetes or are under 65

Haemoglobin

• Levels below 100 g/L suggest worsening anaemia
• Treatment such as erythropoietin (EPO) may be needed

Medications

• Regular review is essential, as doses often need adjustment in CKD

Underlying Cause of CKD

• Revisit the original diagnosis at least once a year
• Some people develop more than one cause of kidney disease, which may affect treatment decisions

Summary

The frequency of GFR monitoring in chronic kidney disease depends on the stage of CKD and how stable kidney function is. Earlier stages usually require annual testing, while advanced CKD needs much closer follow-up.

Regular monitoring helps:

• Detect disease progression early
• Guide treatment changes
• Reduce complications

Top Tips

Write down the date of your next kidney blood test. If your GP surgery does not arrange it, contact them directly.

You can also view your results online using Patient Knows Best (PKB) — a free and easy way to keep track of your kidney health.