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Acute kidney injury recognition and initial management

KDIGO-based AKI detection, staging, cause evaluation, hemodynamic and medicine review, complication management and escalation.

JurisdictionUnited States
Source check2026-08-20
Clinical reviewiatroX editorial team 路 Clinical editorial review 路 reviewed 2026-08-20 路 due 2027-08-20
AudienceUnited States healthcare professionals
This is an iatroX educational summary of named United States sources, not an official guideline. It does not replace the complete source documents, local policy, specialist advice or clinical judgement. Use the named authority, current FDA labeling, applicable state law, payer rules and local protocol where relevant.

Scope of this summary

Adults with possible or confirmed acute kidney injury (AKI) in ambulatory, emergency or inpatient care. The current published KDIGO AKI guideline remains the 2012 document while an AKI/acute-kidney-disease update is in development; this page therefore avoids presenting older evidence as a newly updated US protocol.
sources for this section:KDIGO AKI

The Bottom Line

  • Recognize AKI from a qualifying acute creatinine rise, a rise to at least 1.5 times a known or presumed baseline within seven days, or sustained low urine output; absence of oliguria does not exclude injury.
  • Stage severity using the KDIGO creatinine and urine-output framework, while treating the patient鈥檚 physiology and cause rather than waiting for the stage to worsen.
  • Search promptly for reduced perfusion, intrinsic renal disease and urinary obstruction, and consider that infection, heart failure, liver disease and medicines can contribute simultaneously.
  • Restore effective circulation when depleted, stop avoidable nephrotoxins, adjust medicines to changing renal function and monitor creatinine, electrolytes, acid-base status, fluid balance and urine output.
  • Discuss kidney-replacement therapy for life-threatening fluid, electrolyte or acid-base complications and the broader clinical context; a creatinine number alone is not the indication.
sources for this section:KDIGO AKI

Practical clinical workflow

1
Compare with the best available baseline, repeat the measurement when appropriate, quantify urine output and assess vital signs, volume, sepsis, heart failure, bleeding and recent procedures or contrast.
2
Reconcile prescriptions, over-the-counter analgesics, herbal products and recreational substances; hold or modify agents that worsen hemodynamics, toxicity or accumulation when clinically indicated.
3
Order urinalysis and microscopy, metabolic tests and renal imaging according to the suspected cause; obtain urgent ultrasound when obstruction is possible and specialist tests when glomerular disease is suspected.
4
Treat the cause, give isotonic crystalloid for true volume depletion as appropriate, avoid fluid overload, and reassess response rather than continuing unmeasured fluid by habit.
5
Document an AKI follow-up plan after recovery, including kidney function, albuminuria, blood pressure and medicine review within a timeframe matched to severity and residual impairment.
sources for this section:KDIGO AKI

Safety boundaries and escalation

  • Refractory hyperkalemia, severe acidosis, pulmonary edema, uremic pericarditis or encephalopathy, toxin removal needs, anuria or rapidly progressive renal dysfunction requires urgent nephrology and acute-care escalation.
  • An infected obstructed urinary system is a drainage emergency; antibiotics alone do not relieve obstruction.
  • Avoid using loop diuretics to treat the kidney injury itself; use them only for a supported volume-management indication and monitor response and adverse effects.
  • Estimated GFR equations are unreliable during rapidly changing creatinine; dose high-risk medicines with clinical pharmacy input, levels where available and repeated renal assessment.
sources for this section:KDIGO AKI

Localization

US hospitals should apply their sepsis, contrast, nephrotoxin, pharmacy and dialysis-escalation protocols alongside KDIGO. Coding definitions and payer criteria do not replace clinical AKI criteria.
sources for this section:KDIGO AKI

Source documents

Use the linked source documents for complete recommendations, evidence grading, exclusions and implementation detail.

  1. Kidney Disease: Improving Global OutcomesKDIGO Clinical Practice Guideline for Acute Kidney Injury2012 guideline; current KDIGO AKI guideline page checked 2026-08-20 路 published 2012-03-01 路 accessed 2026-08-20
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