UK kidney health guide

Chronic Kidney Disease Stage 3: What It Means

Chronic kidney disease stage 3 (CKD stage 3) is diagnosed when eGFR is persistently between 30 and 59, alongside evidence that reduced kidney function has lasted at least three months. Stage 3 kidney disease is one of the most common stages people are told about after a routine blood test, and it covers a wide range — which is why clinicians split it into two sub-stages.

Stage 3a and stage 3b

UK kidney staging divides stage 3 into two parts, because outcomes and monitoring needs differ meaningfully across the range:

• Stage 3a — eGFR 45 to 59 (mild-to-moderate reduction). Read the full stage 3a guide.
• Stage 3b — eGFR 30 to 44 (moderate-to-severe reduction). Read the full stage 3b guide.

Is stage 3 CKD serious?

Many people live with stage 3 CKD for years without it progressing significantly, particularly with good blood pressure control and management of underlying causes such as diabetes. Others may see a faster decline. This is why regular monitoring — rather than the stage label alone — is what matters most.

What usually happens next

Your GP will typically monitor eGFR, urine ACR (a measure of protein in the urine), blood pressure and, if relevant, diabetes control at regular intervals. Depending on your specific results and risk factors, you may be managed entirely in primary care or referred to a kidney specialist (nephrologist).

Common questions people ask at stage 3

Can it improve? Will I need dialysis? What should I eat? These are covered in more depth in our stage 3a and stage 3b guides, our CKD diet guide, and our CKD FAQ.

Nisarg Ayurveda provides educational resources and complementary consultation support. Ayurvedic consultation should not replace investigation or treatment recommended by your GP or kidney specialist.