Synopsis
Judge kidney recovery after acute injury, communicate residual risk, restore beneficial medicines safely, and arrange proportionate biochemical, albuminuria and clinical follow-up across the hospital–primary care boundary.
- Recovery is a trajectory, not a single discharge creatinine: compare with the pre-illness baseline, peak, dialysis requirement, current urine output and subsequent stability.
- NICE advises monitoring creatinine after an AKI episode, with frequency based on how stable renal function is and how impaired it remains at discharge.
- An apparent return to baseline does not erase risk; previous AKI predicts recurrence, later CKD and cardiovascular events, so the episode must remain visible in the record.
- A discharge summary should name AKI stage and cause, baseline and peak values, degree of recovery, unresolved abnormalities, medicine changes and exactly who will review which test and when.
- Reconcile every withheld or dose-reduced medicine. Restart decisions should recover the original prognostic benefit while accounting for current volume status, potassium and kidney function.
- Persistent haematuria, significant albuminuria, systemic features, an unclear cause, dialysis-requiring injury or eGFR 30 mL/min/1.73 m² or below after recovery supports renal discussion or referral.
- Check blood pressure and urine albumin as well as filtration during longer-term review; creatinine recovery can coexist with glomerular damage or newly unmasked CKD.
- Give practical prevention advice: maintain appropriate hydration, avoid non-prescribed NSAIDs, seek help during dehydrating illness, and follow a clear temporary medicine plan with explicit restarting instructions.
Key red flags
A renewed rise after initial improvement may follow recurrent infection, poor intake, congestion, hypotension, urinary obstruction or a medicine change. Reapply AKI criteria and assess urgently according to the speed and physiological consequences.
Investigation priorities
Confirm stability or continued recovery, detect recurrent injury and support medicine dosing and restart decisions.
Management branches
An inpatient AKI episode is improving sufficiently for discharge or transfer to another care setting.
- 1. Record the credible baseline, highest stage, likely causes, peak and latest creatinine, urine-output course, complications, imaging, renal replacement therapy and residual abnormalities.
- 2. Reconcile every prescription and state which drugs were stopped, reduced or started, why this occurred, and the clinical and biochemical conditions for review or restart.
- 3. Choose test timing from renal stability, discharge impairment and comorbidity; name the responsible clinician or service and create a result-action plan rather than saying only ‘GP to repeat U&Es’.
- 4. Explain AKI and recurrence warning symptoms to the patient or carer in accessible language, including safe fluid and non-prescribed NSAID advice and how to seek urgent help.
The patient reaches a stable later review, often around three months, or remains abnormal sooner.
- 1. Establish whether reduced filtration or another damage marker has persisted long enough to diagnose CKD, and stage using both GFR and albuminuria where appropriate.
- 2. Check blood pressure, cardiovascular risk, diabetes control, smoking and exposure to nephrotoxins; optimise treatment under the relevant NICE and UKKA guidance.
Key medicines
ACE inhibitor or angiotensin receptor blocker restartResume the previous or an appropriately reduced dose only after reviewing the continuing indication, blood pressure, volume state, creatinine and potassium; follow disease-specific and local titration guidance.Avoid automatic restart during ongoing hypovolaemia, severe hypotension or uncontrolled hyperkalaemia. Arrange post-restart creatinine and potassium testing, and explain any expected small haemodynamic creatinine change in context.
Loop diuretic reviewIndividualise the oral or intravenous dose to congestion, symptoms, blood pressure and prior response; do not use a fixed ‘renal recovery’ dose or prescribe solely to force urine output.Over-diuresis can produce hypovolaemia, hypotension and recurrent AKI, while under-treatment leaves harmful congestion. Monitor weight, symptoms, renal function and electrolytes, and provide a clear adjustment plan where appropriate.