Your kidneys work quietly around the clock — filtering waste from your blood, balancing fluids, and regulating blood pressure. When they start to lose function over time, the condition is called chronic kidney disease (CKD). It affects roughly 1 in 7 American adults, and many people don't know they have it until significant damage has already occurred.

The good news: when CKD is caught early and managed well, you can slow its progression and protect your quality of life. Here is what every patient should understand.

Chronic kidney disease means your kidneys have been damaged and are not filtering blood as well as they should — and this has been going on for three months or longer.

Doctors measure kidney function using a number called the eGFR (estimated glomerular filtration rate). Think of it as a percentage of normal kidney function:

• Stage 1: eGFR 90 or above (kidney damage present, but function is normal)
• Stage 2: eGFR 60–89 (mildly reduced)
• Stage 3: eGFR 30–59 (moderately reduced)
• Stage 4: eGFR 15–29 (severely reduced)
• Stage 5: eGFR below 15 (kidney failure — dialysis or transplant may be needed)

The two most common causes of CKD are diabetes and high blood pressure — both of which are very common in our community here in Bradenton and Manatee County. Other causes include autoimmune diseases, repeated kidney infections, and certain medications taken long-term.

CKD is often called a "silent disease" because early stages produce few or no symptoms. As it progresses, you may notice:

• Fatigue and weakness
• Swelling in the legs, ankles, or feet
• Foamy or dark urine
• Decreased urine output
• Difficulty concentrating
• Nausea or loss of appetite
• Itchy skin

If you have diabetes, high blood pressure, a family history of kidney disease, or are over 60, you should be screened regularly — even if you feel fine.

This is one of the most common questions patients ask, and the honest answer is: it depends on the stage and the cause.

Early-stage CKD (Stages 1–2): In some cases, yes. If the underlying cause — such as poorly controlled blood pressure or diabetes — is identified and treated aggressively, kidney function can stabilize and sometimes partially recover. Certain conditions like dehydration, medication toxicity, or urinary blockages can cause reversible kidney damage when caught early.

Mid-to-late stage CKD (Stages 3–5): The damage to kidney tissue is generally not reversible. However, the goal shifts to slowing progression — and this is very achievable with the right management. Many patients with Stage 3 CKD live for decades without ever reaching kidney failure.

The most important steps to protect your kidneys:

• Control blood pressure — target below 130/80 mmHg
• Manage blood sugar if you have diabetes
• Avoid NSAIDs (ibuprofen, naproxen) — these are hard on the kidneys
• Stay well hydrated
• Work with your doctor on any medications that may affect kidney function

The earlier CKD is caught, the more options you have. This is why routine blood work at your annual physical matters so much.

Diet is one of the most powerful tools for managing CKD. The specific restrictions depend on your stage and your lab values, but here are the general principles your doctor and a renal dietitian will guide you on:

Excess sodium raises blood pressure and causes fluid retention — both harmful to damaged kidneys. Aim for less than 2,000 mg per day. Avoid processed foods, canned soups, fast food, and adding salt at the table.

Healthy kidneys regulate potassium levels in your blood. When kidneys are damaged, potassium can build up to dangerous levels, affecting your heart rhythm. High-potassium foods to limit include:

• Bananas, oranges, and dried fruits
• Potatoes and tomatoes
• Avocados
• Nuts and seeds

Lower-potassium alternatives include apples, berries, grapes, cabbage, and green beans.

Damaged kidneys cannot remove excess phosphorus, which can weaken bones and damage blood vessels over time. Foods high in phosphorus include:

• Dairy products (milk, cheese, yogurt)
• Dark colas
• Processed meats
• Whole grains and bran

High-protein diets create more waste products that the kidneys must filter. In later stages of CKD, your doctor may recommend moderating protein intake. This does not mean eliminating protein — it means being thoughtful about portions.

Most early-stage CKD patients should drink adequate water. In advanced stages, fluid restriction may be necessary. Follow your doctor's specific guidance.

Important: Do not make major dietary changes without guidance from your doctor or a registered dietitian. What is right for one CKD patient may not be right for another, depending on their specific lab values.

When your doctor orders kidney function tests, you will typically see several values on your lab report. Here is what each one means in plain language:

This is the most important number. It estimates how well your kidneys are filtering waste per minute. A normal eGFR is 60 or above. Below 60 for three or more months indicates CKD.

Creatinine is a waste product produced by your muscles. Healthy kidneys filter it out efficiently. When kidneys are struggling, creatinine builds up in the blood. Normal ranges are roughly:

• Men: 0.7–1.3 mg/dL
• Women: 0.5–1.1 mg/dL

A rising creatinine over time is a red flag worth investigating.

BUN measures another waste product — urea — that comes from protein breakdown. Normal is roughly 7–20 mg/dL. Elevated BUN can indicate kidney dysfunction, but it can also rise with dehydration or a high-protein diet, so it is always interpreted alongside creatinine and eGFR.

As mentioned above, damaged kidneys struggle to regulate potassium. Your doctor watches this closely because high potassium (hyperkalemia) can cause dangerous heart arrhythmias.

These are monitored in later stages of CKD because the kidneys play a key role in bone mineral metabolism.

This urine test checks for albumin — a protein that should not normally appear in urine in significant amounts. Protein in the urine (proteinuria) is an early sign of kidney damage, often appearing before eGFR drops. It is a critical test for anyone with diabetes or high blood pressure.

You should schedule an appointment if you:

• Have diabetes or high blood pressure and have not had kidney function checked recently
• Notice swelling, foamy urine, or unexplained fatigue
• Have a family history of kidney disease
• Are taking long-term medications that may affect the kidneys
• Have received abnormal kidney lab results and want to understand what they mean

At Manatee Primary Care, we monitor kidney function as part of routine preventive care and chronic disease management. If you have been diagnosed with CKD or are concerned about your kidney health, we are here to help you understand your numbers and build a plan to protect your kidneys for the long term.

Call us at (941) 867-9362 or request an appointment online. We serve patients throughout Bradenton, West Bradenton, Palmetto, Lakewood Ranch, Anna Maria Island, and surrounding Manatee County communities.