- Is he catheterised — is it blocked? Bladder scan done?
- Obs and fluid balance — is he dry, septic or bleeding?
- Latest U&E and creatinine? Any nephrotoxic drugs?
Do now
- Bladder scan / flush or change the catheter
- Assess volume status
- Fluid challenge if dry, then reassess
- U&E, VBG potassium; hold nephrotoxics
- Hourly urine output
Key doses
- 500 mL crystalloid over 15 min if hypovolaemic, reassess
- Hold NSAIDs, ACEi/ARB, diuretics, metformin, gentamicin
Typical adult doses — always check the BNF and your local guideline.
Call your senior if
- K⁺ ≥ 6.5 or ECG changes
- Anuric, overloaded, or AKI stage 3
- Septic or hypotensive
Think of
- Blocked catheter / retention
- Hypovolaemia
- Sepsis
- AKI from drugs or contrast
- Heart failure
Go deeper
The full walkthroughs behind this call.