Pt. comes with OLIGURIA.
Cause can be hypovolemia or renal failure
Looks for signs of dehydration - if present, it is hypovolemia - start normal saline
If no signs of dehydration, probably AKI, start diuretics to prevent volume overload.
Take usg to rule out obstruction first…then see for any factor causing ATN like sepsis drug etc…then see ure markers like BUN/creat ratio FeNa etc…then if u feel its hypovolemic hydrate…again somebody can’t come with oliguria alone…so its a wholesome evaluation…