Polycystic Kidney Disease (PKD)
What is Polycystic Kidney Disease (PKD)?
Polycystic Kidney Disease is an inherited disorder where fluid-filled sacs called cysts grow in your kidneys. These cysts start small but can grow over time. As they multiply and expand, they replace healthy kidney tissue.
Your kidneys filter waste from your blood and make urine. When cysts take over, your kidneys lose their ability to do this work. PKD comes in two main forms. Autosomal dominant PKD usually shows up in adulthood, often between ages 30 and 40. Autosomal recessive PKD is rarer and affects babies and young children.
PKD is one of the most common genetic kidney diseases. It affects about 500,000 people in the United States. Most people inherit it from a parent who has the condition. The cysts grow slowly over many years, so catching changes early helps you protect your remaining kidney function.
Symptoms
- High blood pressure, often the first sign of PKD
- Pain or heaviness in your back, side, or belly from enlarged kidneys
- Blood in your urine, which may look pink, red, or brown
- Frequent kidney infections or urinary tract infections
- Kidney stones that cause sharp pain
- Headaches, especially if they are frequent or severe
- Increased urination, particularly at night
- Feeling tired or low on energy
- Swelling in your hands, feet, or ankles
Many people with PKD have no symptoms for years or even decades. Your kidneys can lose significant function before you notice anything wrong. This is why regular testing matters, especially if PKD runs in your family.
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Causes and risk factors
PKD is caused by genetic mutations that you inherit from your parents. The mutations affect proteins that help kidney cells develop normally. In autosomal dominant PKD, you need only one mutated gene from one parent to develop the disease. About 90 percent of PKD cases are this type. In autosomal recessive PKD, you must inherit two mutated genes, one from each parent. This form is much less common.
Risk factors include having a family history of PKD. If one parent has autosomal dominant PKD, each child has a 50 percent chance of inheriting it. Race and ethnicity affect risk too. PKD occurs in all ethnic groups but may progress differently in different populations. Age matters because symptoms typically appear later in life for the dominant form. High blood pressure, pregnancy, and repeated kidney infections can speed up disease progression once you have PKD.
How it's diagnosed
Doctors diagnose PKD through imaging tests and blood work. Ultrasound is usually the first test because it can show cysts in your kidneys. CT scans and MRI provide more detailed images and help track how fast cysts are growing. Genetic testing can confirm which type of PKD you have and identify the specific mutation.
Blood tests play a key role in monitoring kidney function once PKD is diagnosed. Creatinine levels show how well your kidneys filter waste. Cystatin C provides accurate measurement of your kidney function as cysts replace healthy tissue. Estimated Glomerular Filtration Rate tracks progressive loss of kidney function over time. Urine blood tests check for hematuria, which happens in 35 to 50 percent of PKD patients when cysts rupture or bleed. Rite Aid offers testing for these key biomarkers so you can monitor your kidney health regularly.
Treatment options
- Control blood pressure with medication and lifestyle changes to slow kidney damage
- Drink plenty of water throughout the day to help your kidneys function
- Follow a kidney-friendly diet lower in sodium and protein if your doctor recommends it
- Treat infections quickly with antibiotics to prevent further kidney damage
- Manage pain with appropriate medications when cysts cause discomfort
- Take tolvaptan, a medication that can slow cyst growth in some patients
- Monitor kidney function with regular blood tests every 3 to 6 months
- Consider dialysis when kidney function drops below 15 percent
- Explore kidney transplant as a treatment option for end-stage kidney disease
- Work with a nephrologist who specializes in kidney diseases
Concerned about Polycystic Kidney Disease (PKD)? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
High blood pressure is often the first sign of PKD, sometimes appearing before other symptoms. You might also notice pain in your back or sides as your kidneys enlarge with cysts. Many people have no symptoms early on, which is why family screening matters. Blood in your urine and frequent kidney infections can also be early warning signs.
You cannot prevent inheriting the genetic mutations that cause PKD. However, you can slow disease progression through early detection and lifestyle changes. Controlling blood pressure, staying hydrated, and avoiding kidney infections all help protect your kidney function. Regular monitoring lets you catch problems early and adjust treatment as needed.
Most doctors recommend blood tests every 3 to 6 months to monitor kidney function in PKD patients. Testing frequency depends on how fast your disease is progressing. Your creatinine, eGFR, and cystatin C levels show whether your kidney function is declining. Regular testing helps your doctor adjust medications and plan for future treatment.
Blood in urine affects 35 to 50 percent of people with PKD at some point. It usually happens when a cyst ruptures, gets infected, or when you pass a kidney stone. Sometimes you can see the blood, making your urine pink or red. Other times it only shows up on a urine test. Always tell your doctor when this happens.
Not everyone with PKD needs dialysis, but about half of people with autosomal dominant PKD reach kidney failure by age 60. Dialysis becomes necessary when your kidneys can no longer filter waste effectively, usually when function drops below 15 percent. Catching changes early and protecting your kidney function can delay or prevent the need for dialysis.
Yes, diet plays an important role in managing PKD progression. Reducing sodium helps control blood pressure, which protects your kidneys. Drinking 2 to 3 liters of water daily may help slow cyst growth. Some people benefit from limiting protein intake as kidney function declines. Work with a dietitian who understands kidney disease to create a plan that works for you.
Blood pressure medications are the main treatment for most PKD patients because high blood pressure damages kidneys faster. ACE inhibitors and ARBs are commonly prescribed. Tolvaptan is a newer medication that can slow cyst growth in people at risk of rapidly progressing disease. Pain medications help manage discomfort, and antibiotics treat infections when they occur.
Life expectancy with PKD varies widely based on how fast your disease progresses. Many people live full lives with good kidney function into their 60s or beyond. Early diagnosis, blood pressure control, and healthy lifestyle choices all improve outcomes. Modern treatments including dialysis and transplant mean most people with PKD can expect near-normal life spans with proper care.
Testing recommendations depend on your child's age and family history. Children of parents with autosomal dominant PKD have a 50 percent chance of inheriting the condition. Most doctors recommend testing after age 18 unless symptoms appear earlier. Genetic counseling helps families understand risks and make informed decisions. Early awareness allows for proactive monitoring and lifestyle choices.
Both tests measure kidney function, but they work differently. Creatinine is a waste product from muscle breakdown that kidneys filter out. Cystatin C is a protein produced by all cells in your body. Cystatin C often provides more accurate kidney function estimates in PKD because it is not affected by muscle mass. Your doctor may use both tests together to get the clearest picture of your kidney health.