Porter Health
Understanding Your Kidney Health
A Patient's Guide to Chronic Kidney Disease Prevention and Management
Your kidneys are two bean-shaped organs that work 24/7 to keep you healthy. They're incredibly important, yet kidney disease often develops silently without symptoms until it's advanced.
What Your Kidneys Do:
The Silent Problem: Chronic Kidney Disease (CKD) affects 1 in 7 adults in the U.S., but 9 out of 10 people with early CKD don't know they have it because there are no symptoms.
Kidney health is measured using two tests that work together to give you a complete picture:
eGFR - Estimated Glomerular Filtration Rate
(Blood Test - Measured in mL/min/1.73m²)
What It Measures:
How well your kidneys are filtering waste from your blood. Think of it like a test of your kidney's "horsepower" - how much blood they can clean per minute.
How It Works:
Your doctor measures creatinine (a waste product) in your blood, then uses a formula that includes your age, sex, and race to estimate how well your kidneys are working.
Higher eGFR = Better kidney function. Lower eGFR = Weaker kidney function.
Understanding Your eGFR Number:
UACR - Urine Albumin-to-Creatinine Ratio
(Urine Test - Measured in mg/g)
What It Measures:
How much protein (albumin) is leaking into your urine. Healthy kidneys keep protein in your blood, but damaged kidneys let it leak out.
Why It Matters:
This test can detect kidney damage years before your eGFR drops. It's like a smoke detector - catching the problem early when it's easiest to prevent further damage.
Lower UACR = Better. Higher UACR = More kidney damage.
Understanding Your UACR Number:
Both Tests Together: The combination of eGFR and UACR gives your complete kidney health picture and determines your CKD stage and risk level.
CKD is classified into 5 stages based on your eGFR. The earlier you catch it, the easier it is to slow or stop progression.
Stage 1: Kidney Damage with Normal Function
eGFR ≥ 90 mL/min/1.73m² with evidence of damage (elevated UACR)
Your kidneys are still filtering well, but there are early signs of damage (usually detected by protein in urine). This is the best time to take action and prevent further damage.
Stage 2: Mildly Decreased Function
eGFR 60-89 mL/min/1.73m² with evidence of damage
Slight decrease in kidney function. Most people still have no symptoms. Lifestyle changes and medications can often prevent worsening.
Stage 3a: Mild to Moderate Decrease
eGFR 45-59 mL/min/1.73m²
Kidneys are working at about half capacity. You may start to feel tired or notice swelling. Important to work closely with your doctor.
Stage 3b: Moderate to Severe Decrease
eGFR 30-44 mL/min/1.73m²
Moderate kidney damage. May experience fatigue, swelling, changes in urination. Medications to protect kidneys and prevent complications are crucial.
Stage 4: Severe Decrease
eGFR 15-29 mL/min/1.73m²
Advanced kidney disease. Symptoms become more noticeable (fatigue, nausea, swelling). Time to prepare for possible dialysis or transplant with your medical team.
Stage 5: Kidney Failure
eGFR < 15 mL/min/1.73m²
Kidneys can no longer sustain life without treatment. Dialysis or kidney transplant needed to survive.
Certain conditions and factors significantly increase your risk of developing CKD:
Diabetes
Leading cause - high blood sugar damages kidney filters
High Blood Pressure
Second leading cause - damages blood vessels in kidneys
Heart Disease
Kidney and heart health are closely connected
Family History of CKD
Genetic factors increase your risk
Age Over 60
Kidney function naturally declines with age
Obesity
Increases strain on kidneys and raises diabetes/BP risk
The good news: CKD is often preventable, and even if you have it, you can slow or stop its progression with the right actions.
Lifestyle Changes That Protect Your Kidneys
Control Blood Sugar
Keep HbA1c below 7% if diabetic. High blood sugar damages kidney filters.
Action: Check blood sugar regularly, take diabetes medications as prescribed
Manage Blood Pressure
Target: Less than 120/80 mmHg. High BP is the #2 cause of kidney damage.
Action: Monitor daily, reduce salt intake, take BP medications consistently
Eat a Kidney-Friendly Diet
Focus on fruits, vegetables, whole grains. Limit sodium, processed foods, and red meat.
Action: Aim for less than 2,300mg sodium daily (1 teaspoon of salt)
Stay Active
Regular exercise helps control BP, blood sugar, and weight.
Action: Aim for 150 minutes of moderate activity per week (30 min, 5 days)
Maintain Healthy Weight
Excess weight strains kidneys and raises diabetes/BP risk.
Action: Even 5-10% weight loss can significantly reduce kidney stress
Quit Smoking
Smoking damages blood vessels in kidneys and speeds CKD progression.
Action: Ask your doctor about smoking cessation programs and medications
Stay Hydrated
Drink enough water to help kidneys flush out toxins.
Action: Aim for 6-8 glasses daily (unless your doctor advises otherwise)
Limit NSAIDs
Overuse of ibuprofen (Advil), naproxen (Aleve) can damage kidneys.
Action: Use acetaminophen (Tylenol) instead, or ask doctor for alternatives
Medications That Protect Your Kidneys
Talk to your doctor about these evidence-based medications that can slow CKD progression:
ACE Inhibitors or ARBs
Blood pressure medications that specifically protect kidney function by reducing protein leakage.
Examples: Lisinopril, enalapril (ACE-I); losartan, valsartan (ARB)
SGLT2 Inhibitors
Originally for diabetes, now proven to slow CKD progression even if you're not diabetic. Game-changing medication for kidney protection.
Examples: Empagliflozin (Jardiance), dapagliflozin (Farxiga), canagliflozin (Invokana)
GLP-1 Receptor Agonists
Help with weight loss, blood sugar control, and provide kidney protection.
Examples: Semaglutide (Ozempic, Wegovy), liraglutide (Victoza)
Statins
Lower cholesterol and reduce cardiovascular risk (heart and kidney health are connected).
Examples: Atorvastatin (Lipitor), rosuvastatin (Crestor)
Regular Monitoring
How Often Should You Test?
If you have diabetes or high BP:
Check eGFR and UACR at least once per year
If you have CKD Stage 3 or higher:
Check every 3-6 months to monitor progression
Track your blood pressure:
Daily at home, keep a log for your doctor
Use this checklist to guide your conversation about kidney health:
Early CKD has NO symptoms - testing is the only way to know
Two simple tests (eGFR blood test + UACR urine test) tell you everything
CKD is often preventable and manageable with lifestyle changes
Controlling blood sugar and blood pressure is crucial
New medications (SGLT2 inhibitors) can dramatically slow progression
The earlier you catch it, the easier it is to protect your kidneys
Regular monitoring helps you and your doctor stay ahead of problems
Reference:
Based on the Kidney Disease: Improving Global Outcomes (KDIGO) 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. This guide translates clinical guidelines into patient-friendly language to help you understand and manage your kidney health.
Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int. 2024;105(4S):S117-S314. doi:10.1016/j.kint.2023.10.018