7 Integrated Renal Practice Questions
A practical guide to interpreting acute and chronic kidney findings, recognizing urgent complications, and understanding renal treatment priorities.
Interpreting kidney findings
Interpret kidney findings using trends, urine output, symptoms, and fluid status rather than an isolated creatinine result. Urgent threats such as dangerous potassium changes, fluid overload, and urinary obstruction require timely attention. Treatment plans, including dialysis and fluid guidance, depend on the patient's condition and individualized clinical plan.
and volume depletion
(AKI) can be identified by a change in kidney function; the creatinine increase in the case is mg/dL within hours. A creatinine level does not have to reach mg/dL for the change to meet an AKI criterion.
Vomiting and diarrhea, dizziness on standing, and dry mucous membranes point toward volume depletion in the case. Initial management focuses on assessing and correcting likely volume depletion, reviewing medicines that may worsen kidney injury, and monitoring urine output and laboratory results. The patient had taken ibuprofen while continuing an ACE inhibitor, so medication review is part of the response.
Classifying
(CKD) requires kidney abnormalities that persist for at least months. An eGFR of mL/min/1.73 m² lasting months is in category , which covers mL/min/1.73 m². A UACR of mg/g is in category , defined here as above mg/g. Together, these results are classified as CKD .
GFR and albuminuria categories are used together to describe CKD. The duration of an abnormality matters when distinguishing chronic disease from an acute change.
Urgent electrolyte and fluid complications
with peaked T waves on an ECG is an immediate risk. In the practice case, potassium is mmol/L, with increasing oxygen needs and pulmonary crackles as additional concerns. Stabilization and urgent treatment take priority; the response should not wait for a repeat creatinine.
Dialysis is considered in the context of life-threatening electrolyte, acid–base, or fluid problems—not a creatinine number alone. A single elevated potassium result should be interpreted clinically: measurements can vary, and treatment should not be assumed to be the same for every patient.
and obstruction
Inability to urinate with severe lower abdominal discomfort, a markedly distended bladder, and bilateral hydronephrosis indicates a need for prompt attention to and obstruction. Arrange prompt bladder drainage with a catheter and evaluate the cause of the obstruction. Relieving the obstruction is important; delaying drainage, treating only a presumed infection, or beginning dialysis before addressing the obstruction does not address the immediate problem.
Fluid balance during
A rise in weight between treatments may largely reflect retained fluid. For a patient who is kg above the prescribed postdialysis weight and has ankle edema, assess volume status and follow the individualized dialysis and sodium or fluid plan. Fluid recommendations vary by patient and treatment; do not assume excess fluid can be ignored or change the dialysis prescription without assessment and consultation with the dialysis team.
Complications of
Advanced CKD may be associated with anemia, metabolic acidosis, phosphate abnormalities, and . The case results—hemoglobin g/dL, bicarbonate mmol/L, elevated phosphate, and potassium mmol/L—need clinical interpretation, including assessment of severity and causes. Prioritize potassium-related risk and individualize treatment and follow-up; the hemoglobin result alone does not prove acute blood loss.
Possible peritonitis during
New abdominal pain and fever with cloudy fluid are concerning for possible peritonitis. Arrange urgent assessment and contact the dialysis team for prompt testing and treatment. Cloudy fluid should not be dismissed as an expected effect, and symptoms should not be left for several days without assessment.