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Renal General Medicine Strong — widely validated; now largely replaced by CKD-EPI in clinical use

MDRD GFR Equation

Modification of Diet in Renal Disease (MDRD) 4-variable equation for estimating GFR. Largely superseded by CKD-EPI but still widely reported by laboratories.

Used in: Chronic Kidney Disease

Score interpretation

CKD G1 — Normal or High GFR ≥ 90

eGFR ≥ 90 mL/min/1.73m²: Normal or high kidney function (if structural/marker evidence of CKD).

→ Monitor annually if CKD markers present. Optimise cardiovascular risk factors.

CKD G2 — Mildly Decreased 60–89

eGFR 60–89: Mildly decreased. Only CKD if other markers present.

→ Annual monitoring. BP control (target <130/80 in CKD). ACEi/ARB if proteinuria.

CKD G3a — Mildly-Moderately Decreased 45–59

eGFR 45–59: Mildly to moderately decreased.

→ 6-monthly monitoring. Review nephrotoxic drugs. Anaemia screen (FBC, ferritin, B12, folate). PTH, phosphate.

CKD G3b — Moderately-Severely Decreased 30–44

eGFR 30–44: Moderately to severely decreased.

→ Nephrology referral if declining. Manage anaemia (ESA), bone disease (phosphate binders). Avoid NSAIDs/contrast/nephrotoxins.

CKD G4 — Severely Decreased 15–29

eGFR 15–29: Severely decreased. Pre-dialysis planning.

→ Nephrology review. RRT planning (dialysis, transplant). AV fistula creation. Dietitian input. Immunisations (hepatitis B, pneumococcal).

CKD G5 — Kidney Failure 0–14

eGFR < 15: Kidney failure.

→ Urgent nephrology. RRT initiation if symptomatic. Conservative pathway if elected. Emergency dialysis if hyperkalaemia/fluid overload/uraemia.

Interpretation bands for the MDRD GFR. Apply clinical judgement and local guidance.

References

Related

Curated clinical cross-links plus same-class fallbacks.

📚 MRCEM Revision

Featured in these MRCEM clinical pathways

The MDRD GFR is covered in detail — with RCEM/NICE evidence base, indications and pitfalls — in the following exam-focused pathways on our sister siteReviseMRCEM.

MRCEM Primary / Intermediate / OSCE candidates: each pathway includes exam-style questions, RCEM/NICE citations, and FAQ summaries.

Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.