HealthcareBy City Prime Care Team
How Can You Tell If Your Kidneys Are Healthy? Reading the Kidney Tests, the Five Risk Checks and the Sample Kidney-Protection Plan
Chronic kidney disease is often silent until it is advanced. Learn the two key tests, who is at risk, how stages are defined, how to protect your kidneys, and a sample kidney-protection plan.
Medically reviewed by City Prime Care Administrator9 min read
Table of contents
Your kidneys quietly filter waste and extra fluid from your blood around the clock, balance salts and minerals, help control blood pressure, and support healthy bones and red blood cells. They can lose a large share of their function before you notice anything wrong. That is why chronic kidney disease, or CKD, is often found only through simple blood and urine tests, and why people at risk are encouraged to be tested.
This guide explains how to tell whether your kidneys are healthy: the two key tests, how CKD stages are defined, who is at risk, five risk checks, how to protect your kidneys, and a sample kidney-protection plan. It draws on what City Prime Care says on its chronic disease management, diagnostic testing, and geriatric care pages, which describe kidney function checks, yearly kidney tests for diabetes, and medicine reviews that consider kidney function, together with national guidance. It is general education, not personal medical advice. You can find the clinic on Google: City Prime Care on Google. See the clinic's chronic disease management page.
In this article:
- 1. What the kidneys do, and why CKD is silent
- 2. The two key tests (table)
- 3. CKD stages (table and graph)
- 4. Who is at risk
- 5. The five risk checks
- 6. How to protect your kidneys
- 7. A sample kidney-protection plan
- 8. Red flags and booking
1. What the Kidneys Do, and Why CKD Is Silent
Each kidney contains about a million tiny filters. When damage accumulates from high blood sugar, high blood pressure, or other causes, these filters work less well. Early CKD usually causes no symptoms. Later signs can include swelling in the legs, tiredness, poor appetite, nausea, itching, changes in urination, and trouble concentrating, but these overlap with many other conditions.
The clinic's chronic disease page says diabetes affects the eyes, kidneys, nerves, heart, and feet, and that its comprehensive metabolic panel checks kidney function, liver enzymes, electrolytes, and glucose. For plain-language background, see the National Institute of Diabetes and Digestive and Kidney Diseases' CKD information, the National Kidney Foundation, and the MedlinePlus CKD page.
2. The Two Key Tests
| Test | What it measures | Why it matters |
|---|---|---|
| 1. Blood creatinine and eGFR (estimated glomerular filtration rate) | How well the kidneys filter the blood; creatinine is a waste product, and eGFR is calculated from it with age and sex | A lower eGFR means less filtering; part of the comprehensive metabolic panel; see common blood tests |
| 2. Urine albumin-to-creatinine ratio (uACR) | How much of the protein albumin leaks into the urine | Protein in the urine is an early sign of kidney damage, often before eGFR falls |
| Other tests | Blood pressure, urinalysis, kidney ultrasound, electrolytes | Help find the cause and complications |
Diagnosis of CKD generally requires abnormal results lasting at least three months, since a single result can be affected by illness or dehydration. See our guide on reading your blood test results.
3. CKD Stages
The table below summarizes the commonly used stages by eGFR (mL/min/1.73 m²). Your clinician also considers urine albumin and the cause. The graph shows relative kidney function from higher to lower.
| Stage | eGFR | Kidney function (graph) | General meaning |
|---|---|---|---|
| 1 | 90 or higher | ██████████ | Normal or high filtering, with signs of kidney damage such as protein in urine |
| 2 | 60 to 89 | ████████░░ | Mildly reduced, with signs of damage |
| 3a | 45 to 59 | ██████░░░░ | Mildly to moderately reduced |
| 3b | 30 to 44 | █████░░░░░ | Moderately to severely reduced |
| 4 | 15 to 29 | ███░░░░░░░ | Severely reduced; specialist care and planning |
| 5 | Below 15 | █░░░░░░░░░ | Kidney failure; dialysis or transplant discussed |
Many people with stage 1 to 3 never progress to kidney failure, especially when blood pressure and blood sugar are well controlled.
4. Who Is at Risk
| Risk factor | Why it matters | What helps |
|---|---|---|
| 1. Diabetes | High blood sugar damages kidney filters; the clinic says yearly kidney tests are kept on schedule | See diabetes checkups and prediabetes |
| 2. High blood pressure | Damages small blood vessels in the kidneys, and kidney disease raises blood pressure further | See blood pressure guide |
| 3. Heart disease | Shares risk factors | See heart warning signs in men |
| 4. Family history of kidney disease | Risk runs in families | Tell your provider |
| 5. Age 60 and older | Filtering naturally declines | Regular checks; see the clinic's geriatric care page |
| 6. Long-term use of some medicines | Frequent use of anti-inflammatory pain relievers can harm kidneys | Ask a pharmacist or clinician; see managing many medicines |
| 7. Repeated kidney infections or stones | Can scar the kidneys | See kidney stones and UTI guide |
| 8. Obesity and smoking | Raise risk through blood pressure and diabetes | Lifestyle changes |
5. The Five Risk Checks
Ask your clinician about these five checks, especially if you have any risk factor:
- Blood pressure: check it regularly, including at home if advised.
- Blood sugar: ask about A1c or glucose testing, since diabetes and prediabetes are leading causes of CKD.
- Kidney function blood test: eGFR from a metabolic panel; the clinic says it checks kidney function in routine lab work and for patients on medicines such as some blood pressure drugs.
- Urine albumin test (uACR): a simple urine sample to look for early protein leakage.
- Medicine and supplement review: bring every bottle, since some medicines need dose adjustments as kidney function changes.
The clinic's geriatric page says doses are reviewed against kidney function because a dose that worked at 55 may be too strong at 80.
6. How to Protect Your Kidneys
| Habit | Practical step |
|---|---|
| Control blood pressure | Take medicine as prescribed and keep readings in your target range |
| Control blood sugar | Follow your diabetes plan; keep A1c in your target range |
| Eat for your heart and kidneys | Less salt, more vegetables and fruit, and balanced protein; ask about limits if CKD is diagnosed |
| Stay hydrated | Drink enough water; see dehydration warning signs |
| Be careful with pain relievers | Avoid regular use of anti-inflammatory pain relievers without advice |
| Do not smoke; limit alcohol | Both raise risk; see quitting smoking |
| Stay active and manage weight | See weight management |
| Keep up with checkups | See the annual physical guide |
7. A Sample Kidney-Protection Plan
The plan below is illustrative, not a prescription. Each block shows relative priority for someone with diabetes or high blood pressure.
| Action | Priority (graph) | How often |
|---|---|---|
| Blood pressure checks | ██████████ | Each visit and at home as advised |
| A1c and glucose | █████████░ | About twice a year when well controlled; every three months if treatment changes, per the clinic's chronic disease page |
| eGFR and urine albumin | ████████░░ | At least yearly with diabetes, or as advised |
| Medicine review | ███████░░░ | At least yearly and after any hospital stay |
| Hydration and salt habits | ██████░░░░ | Daily |
| Activity and weight | █████░░░░░ | Most days |
If CKD is found, the clinic says patients with long-term conditions are followed through chronic disease management, with referral to a kidney specialist when needed; see our guide on when your doctor sends you to a specialist and how chronic disease management works.
8. Red Flags and Booking
| Warning sign | Action |
|---|---|
| Very little or no urine, confusion, or severe weakness | Call 911 or go to the ER |
| Chest pain, trouble breathing, or signs of a stroke | Call 911; see our guide on chest discomfort |
| Swelling in the legs or face, foamy urine, or blood in the urine | Book a prompt visit |
| Severe flank pain with fever or vomiting | Go to the ER or urgent care |
| Persistent fatigue, itching, or poor appetite with risk factors | Ask for kidney tests |
| You have diabetes or high blood pressure and no recent kidney test | Book a visit through the appointment page |
Conclusion
Healthy kidneys work silently, which is why testing matters. If you have diabetes, high blood pressure, or other risk factors, a blood test and a urine test once a year can catch trouble early, when treatment works best.
Contact Us: To ask about kidney function tests, diabetes or blood pressure care, or medicine reviews, reach City Prime Care through our Contact Us page, or find the clinic on Google: City Prime Care on Google. This article is for general information and does not replace personal medical advice. In an emergency, call 911.
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