# The Nephrology Encounter: Syndrome, Site, Time, Cause

Present a kidney problem as time course + syndrome + likely compartment, then state the next action and its purpose.

![Infographic: The Nephrology Encounter: Syndrome, Site, Time, Cause](https://urinenephrology.org/visual-reference/images/student-clinical-framework.png?v=20261003c)

## First: identify immediate threats

Obtain urgent help for ECG-toxic hyperkalemia, hypoxemic pulmonary edema, seizures with a sodium disorder, severe acidemia, anuria with suspected obstruction, or pulmonary hemorrhage with rapidly progressive kidney injury.

## Establish the time course

Compare with prior creatinine and urine output. AKI criteria include creatinine rise ≥0.3 mg/dL in 48 hours, ≥1.5-fold within 7 days, or urine output <0.5 mL/kg/h for 6 hours. CKD requires abnormalities for ≥3 months.

## Build a minimum dataset

Obtain chemistry results, urinalysis with microscopy, protein quantification, medication/exposure history, blood pressure, weight/volume examination, and baseline kidney results. Add bladder assessment or imaging if drainage is uncertain.

## Localize using a positive clue

Red-cell casts suggest glomerular bleeding; muddy-brown casts support tubular injury; pyuria suggests inflammation or infection. A bland sediment does not exclude significant disease. Proteinuria and time course refine each clue.

## Choose a test that changes a decision

Anuria plus a full bladder → assess retention and relieve obstruction. Hematuria/proteinuria plus rapid decline → targeted serology and urgent nephrology assessment. Avoid ordering a broad immune panel for an isolated stable creatinine.

## Make reassessment explicit

State which medicines/exposures were changed, what laboratory or urine-output trend will be reviewed, when it will be reviewed, and who owns escalation. A working diagnosis is useful only if the plan can detect that it is wrong.

## Source lessons

- [chapter 01 introduction](https://urinenephrology.org/nephrology-textbook/chapters/chapter-01-introduction.html)
- [enhanced student nephrology reference](https://urinenephrology.org/student-resources/foundations/enhanced_student_nephrology_reference.html)
- [nephrology quick start guide](https://urinenephrology.org/student-resources/foundations/nephrology-quick-start-guide.html)
- [structure of renal disease student handout](https://urinenephrology.org/student-resources/foundations/structure-of-renal-disease-student-handout.html)

Read alongside the full lessons; the findings and decisions shown here require the stated clinical context.