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Kidney Questions Answered in Plain Language

Start exploring below. Your kidneys do much more than make urine. They filter your blood, balance your fluids, control blood pressure, and support bone and red blood cell health. But how exactly do they do all this? This page is your one-stop resource for understanding how the kidneys work—one question at a time. Whether you are curious about how much urine is normal, what kidneys remove from the blood, or what happens with only one kidney, you will find simple, science-backed answers here. Each topic below links to a short article that explains one key question in plain language. These articles are designed for anyone to understand—no medical background needed. As new articles are published, they will be added to the list below. Bookmark this page and check back often for the latest updates. What do the kidneys do in the human body? How do the kidneys filter blood? Where are the kidneys located in the body? Can you live a normal life with one kidney? How much urine do healthy kidneys ...
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Can Kidney Disease Be Reversed?

Whether kidney disease can be reversed depends on the cause, the stage of the disease, and how early it is detected. In general, chronic kidney disease (CKD) is considered a long-term condition that tends to get worse over time. While it may not be fully reversible, its progress can often be slowed or even stopped with the right treatment. In the early stages, lifestyle changes and medications can help protect your remaining kidney function. This includes: Controlling blood pressure Managing blood sugar in people with diabetes Reducing salt and protein intake Staying well-hydrated Avoiding medications that may harm the kidneys, such as certain painkillers If CKD is caught early, these steps can prevent further damage and help you maintain good kidney function for many years. In contrast, acute kidney injury (AKI)—a sudden loss of kidney function due to illness, dehydration, or medications—is often reversible. With quick treatment, such as IV fluids, stopping harmful medications, or tre...
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What Are Normal Levels of Urea and Creatinine in the Blood?

Urea and creatinine are two important waste products found in your blood. They are measured through routine blood tests to help evaluate how well your kidneys are working. If your kidneys are healthy, they filter out these substances and remove them from the body through urine. When kidney function slows down, urea and creatinine levels can rise. Normal levels of urea, often reported as blood urea nitrogen (BUN), usually fall within the range of: 7 to 20 mg/dL (milligrams per deciliter) BUN levels can vary depending on how much protein you eat, how hydrated you are, and whether you are taking certain medications. A slightly high or low level is not always a cause for concern, but a consistently elevated BUN may signal reduced kidney function or dehydration. Normal levels of creatinine in the blood are: 0.6 to 1.2 mg/dL for men 0.5 to 1.1 mg/dL for women Creatinine is produced by muscle metabolism and cleared by the kidneys. Unlike BUN, creatinine is less affected by diet, which makes i...
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