This is a fictional, illustrative case created for education. It is not medical advice, diagnosis, or treatment, and does not describe a real person.
His kidney number was normal. The leak was not.
Malcolm, 39: normal creatinine, normal eGFR, family history of dialysis. The clue was albumin in his urine — the early leak that changed the whole story.
Persona
Malcolm, 39, Male, African American, High school assistant principal.
His father started dialysis at 56. Malcolm's routine labs look normal: creatinine 1.0 mg/dL, eGFR 92. But his urine albumin-creatinine ratio has been high twice, and his blood pressure sits around 138/86. He was told to watch it and repeat next year. He wants to know whether his family history makes that too casual.
Family history: Father: kidney failure and dialysis at 56. Paternal aunt: hypertension and chronic kidney disease. Mother: type 2 diabetes, no kidney disease.
Clinical picture
Symptoms
- No symptoms — feels well and exercises occasionally
- Borderline blood pressure over three routine visits
- Persistent urine albumin on two tests three months apart
- Anxiety about repeating his father’s dialysis story
Labs
- Creatinine: 1.0 mg/dL (0.7–1.3 mg/dL)
- eGFR: 92 mL/min/1.73m² (>90)
- Urine albumin-creatinine ratio: 84 mg/g (<30 mg/g)
- Blood Pressure: 138/86 mmHg (<130/80 mmHg)
Medications
- No prescription medications
Supplements
- Multivitamin occasionally
Lifestyle
- Desk-heavy workday, walks on weekends
- High-sodium restaurant meals 3–4 times/week
- Non-smoker
- Alcohol: 2–4 drinks/week
- Sleep: 6–7 hours, often interrupted by work stress
Genetics
- APOL1 G1/G2 kidney-risk genotype (Two APOL1 risk alleles): Malcolm's result does not mean kidney failure is certain. It means blood pressure and urine albumin deserve earlier attention than they would for an average patient.
- UMOD Promoter risk variant (Higher uromodulin expression pattern): His kidneys may hold on to more salt, quietly pushing blood pressure and pressure inside the kidney filter upward.
- AGT M235T (T allele carrier): His blood pressure system is biased toward higher pressure. Even a mildly high reading may put extra force on a vulnerable kidney filter.
The normal result was not the full answer
Malcolm's father started dialysis before retirement age. So when Malcolm saw normal creatinine and eGFR on his own labs, he felt reassured. His family doctor was reassured too. But another result kept showing up: albumin in the urine. It did not cause pain, swelling, or fatigue. It was just a leak — easy to miss if you only look at filtration, but important if you know how kidney damage can start.
eGFR measures flow. Albumin shows the leak.
Creatinine and eGFR answer one question: how much filtering capacity is left today? Albumin-creatinine ratio asks a different question: is the kidney filter leaking protein it should keep in the blood? Those timelines do not always move together. A person can have normal filtration while the filter wall is already under stress. Malcolm's normal eGFR is good news. It is not the whole story.
The urine leak mattered more in his case
The albumin result looks mild until you add the family story and genetics. Malcolm carries two APOL1 kidney-risk alleles. That does not diagnose kidney disease or make kidney failure inevitable. It does lower the threshold for action. Persistent albuminuria, borderline blood pressure, and a family history of dialysis now point to one picture: the kidney filter may be under pressure before filtration has fallen.
His blood pressure was also kidney pressure
The blood pressure number is not only about heart risk. UMOD points toward salt retention, and AGT points toward a hormone pathway that can raise pressure inside the glomerulus, the kidney's filter. For many people, 138/86 is a cardiovascular warning. For Malcolm, it may also be mechanical stress on a genetically vulnerable filter. The target changes: protect the kidney before eGFR starts to fall.
Five conversations worth having now
- Repeat the urine albumin-creatinine ratio to confirm the leak is persistent. One abnormal result can be noise; two or more over 3–6 months is a kidney-risk signal.
- Ask for a nephrology referral based on APOL1 high-risk genotype, persistent albuminuria, and family history of kidney failure. The goal is early prevention, not late rescue.
- Treat blood pressure as kidney protection. Ask whether an ACE inhibitor or ARB is appropriate, since these medications can reduce albuminuria and lower pressure inside the kidney filter.
- Reduce sodium and track blood pressure at home. With UMOD and AGT pointing toward salt-sensitive pressure, sodium reduction is targeted treatment for his mechanism.
- Avoid avoidable kidney stressors: frequent NSAID use, dehydration during illness, and unmonitored high-protein supplement routines. For Malcolm, kidney reserve is something to preserve deliberately.
Why normal eGFR missed the leak
Creatinine says filtration is preserved. Albuminuria plus APOL1 says the filter may already be under stress. These levers focus on preserving reserve early. Normal eGFR + persistent albuminuria + APOL1 high-risk genotype baseline 72%.
- Confirm albuminuria and refer early: Early kidney specialist input can change monitoring and prevention before filtration declines.
- Lower BP with kidney-protective strategy: ACE inhibitor or ARB therapy can reduce glomerular pressure and albumin leakage when clinically appropriate.
- Sodium reduction for salt-sensitive pressure: UMOD and AGT make sodium intake part of the mechanism, not generic lifestyle advice.