What are the referral criteria for a patient with a GFR below 30 mL/min in primary care?

Refer adults with CKD for specialist assessment if they have a sustained decrease in eGFR of 25% or more and a change in eGFR category within 12 months, or a sustained decrease in eGFR of 15 mL/min/1.73 m² or more per year, if their GFR is below 30 mL/min/1.73 m² (G4 or G5). ¹