eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m²: Is That High?

Written by

Ernestas K.

Clinical research writer specializing in human health, biology, and preventive medicine.

Reviewed against NKF, NIH, CDC, KDIGO, Mayo Clinic guidelines · Last reviewed March 26, 2026

Is eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m² Low, Normal, or High?

eGFR (Estimated Glomeromerular Filtration Rate) 38 mL/min/1.73m² might be considered lower than what is typically expected for many healthy adults. This specific measurement suggests that your kidneys may not be filtering waste from your blood as effectively as they once did. Such a reading often prompts further investigation into underlying common factors that can influence kidney function, like long-standing high blood pressure or diabetes. It's a signal that your body's natural waste removal system is working with reduced efficiency. Understanding this number is the first step in learning what it means for your overall well-being and taking proactive steps.

Hidden Risk of eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m²

Understanding an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m² goes beyond simply knowing the number; it involves recognizing potential underlying health risks that can influence your future well-being. This particular eGFR value indicates that kidney function is moderately reduced, and this can have ripple effects throughout your body. One of the primary concerns at this level is the increased possibility of existing conditions, such as high blood pressure or diabetes, contributing to further decline in kidney function over time. When your kidneys aren't filtering as efficiently, waste products can build up, potentially straining other organ systems, particularly the cardiovascular system. The National Kidney Foundation emphasizes that individuals with reduced kidney function have a higher likelihood of developing heart and blood vessel problems. This connection highlights why maintaining a healthy eGFR is an important part of managing overall health. It also encourages a deeper look into common causes like chronic conditions that might be quietly impacting your body. Taking steps to address these underlying factors can be crucial for preserving your remaining kidney function and promoting long-term health. The goal is to proactively manage your health picture to slow any potential progression. Early awareness allows for informed discussions with healthcare professionals about personalized strategies to support your health. When your eGFR is 38 mL/min/1.73m², it's often a prompt to consider several aspects of your health more closely.

• Cardiovascular health: Reduced eGFR is closely linked to an increased risk of heart disease.
• Bone health: Kidneys play a role in maintaining strong bones, and a lower eGFR can affect this balance.
• Anemia: Kidneys produce a hormone vital for red blood cell production, which can be impacted at this eGFR level.

What Does a eGFR (Estimated Glomerular Filtration Rate) Level of 38 mL/min/1.73m² Mean?

To better understand what an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m² signifies, imagine your kidneys as a sophisticated water purification system for your body. This system continuously filters your blood, removing waste products and excess water, much like a filter cleans tap water. The 'glomerular filtration rate' is essentially a measure of how quickly and effectively this filtering process is happening. Think of it like the flow rate of water through your purification system. A healthy system has a robust flow, efficiently clearing impurities. An eGFR of 38 mL/min/1.73m² suggests that your body's purification system is operating at a reduced capacity, not quite as swiftly or thoroughly as it typically would. The 'mL/min/1.73m²' part of the measurement standardizes the result to an average body size, helping healthcare providers compare your kidney function across different people, regardless of their individual height or weight. So, while your actual kidneys might be larger or smaller, this standardization helps put everyone on a similar playing field for assessment. This specific value indicates that approximately 38 milliliters of blood are being filtered each minute, adjusted for that standard body surface area. When this rate is lower, it means waste products might not be clearing out as quickly, which could lead to a buildup over time. Common causes for a reduced eGFR often involve conditions that place stress on the kidneys over many years, such as persistent high blood pressure that damages the delicate filtering units, or uncontrolled diabetes, which can harm kidney blood vessels. It’s also important to remember that eGFR is an *estimate*, calculated using factors like your age, sex, and blood creatinine levels, which is a waste product from muscle metabolism. It's not a direct measurement but a very helpful indicator of how well your kidneys are functioning and whether further investigation or management is needed to address any underlying issues that could be affecting this vital organ system. This information empowers you to have a meaningful conversation with your doctor about your kidney health.

Lifestyle Changes for eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m²

Beyond dietary adjustments, several other lifestyle changes can be highly supportive for someone with an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m². These choices play a significant role in overall health and can influence how well your kidneys function over time. Regular physical activity, for instance, can help manage blood pressure and blood sugar levels, two common causes of reduced kidney function. The Centers for Disease Control and Prevention (CDC) recommends engaging in moderate-intensity exercise most days of the week, which could include brisk walking, swimming, or cycling. The key is to find activities you enjoy and can sustain consistently, as this regular movement helps improve circulation and reduces stress on the kidneys. Maintaining a healthy body weight is another crucial factor. Excess weight can put additional strain on the kidneys and worsen conditions like high blood pressure and diabetes. By achieving and maintaining a weight that is healthy for you, you can indirectly support your kidney health. Quitting smoking, if you are a smoker, is perhaps one of the most impactful changes. Smoking damages blood vessels throughout the body, including those in the kidneys, making their job harder and potentially accelerating a decline in eGFR. Managing stress is also essential. Chronic stress can contribute to higher blood pressure, which in turn can affect kidney function. Incorporating stress-reducing practices into your daily routine, such as meditation, deep breathing exercises, spending time in nature, or engaging in hobbies, can be beneficial. It's also important to be mindful of over-the-counter medications. Certain pain relievers, particularly nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, can affect kidney function, especially with prolonged use or in individuals with already reduced eGFR. Always discuss all medications, including over-the-counter options, with your healthcare provider to ensure they are safe for your specific eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m² and overall health. Adequate, but not excessive, hydration is also important; your doctor can guide you on the right amount of fluid intake for your individual situation.

Diet Changes for eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m²

When your eGFR (Estimated Glomerular Filtration Rate) is 38 mL/min/1.73m², making informed dietary choices becomes an even more important part of your overall health strategy. The foods and drinks you consume directly impact your body's systems, including your kidneys. The goal is often to lighten the load on your kidneys, helping them manage waste and maintain balance. One of the most common causes of kidney issues is related to chronic conditions, and diet plays a vital role in managing these. For instance, controlling blood pressure and blood sugar through dietary means can significantly support kidney health. Reducing sodium intake is a key recommendation. Excess sodium can raise blood pressure, which puts additional strain on your kidneys. Look for low-sodium options, cook at home more often to control ingredients, and use herbs and spices for flavor instead of salt. Your healthcare provider or a registered dietitian can offer specific guidance tailored to your eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m² and other health needs, especially regarding nutrients like potassium and phosphorus. These minerals, normally managed by the kidneys, can build up when kidney function is reduced. Therefore, you might be advised to limit foods high in potassium, such as bananas, oranges, and potatoes, or high in phosphorus, found in many dairy products, nuts, and processed foods. The American Heart Association (AHA) and the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) both provide resources on heart-healthy and kidney-friendly eating patterns that often align, focusing on whole, unprocessed foods. Choosing fresh fruits and vegetables, lean proteins, and whole grains can provide essential nutrients without overtaxing your kidneys.

• Reduce sodium: Limit processed foods, canned soups, and salty snacks.
• Monitor potassium: Be aware of high-potassium foods and discuss appropriate limits with your doctor.
• Watch phosphorus: Limit dairy products, nuts, and dark sodas, as phosphorus can accumulate.
• Choose lean proteins: Opt for poultry, fish, and plant-based protein sources in appropriate portions.
• Stay hydrated: Drink water as advised by your healthcare provider, avoiding sugary drinks.

eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m² in Men, Women, Elderly, and Kids

The interpretation of an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m² can vary depending on individual factors such as age, sex, and body size. Since eGFR is an estimate, these elements are often built into the calculation itself. For example, a 38 mL/min/1.73m² result in an older adult, perhaps someone in their 70s or 80s, might be viewed somewhat differently than the same result in a younger person, say in their 30s or 40s. As people age, it's natural for kidney function to gradually decline, much like other bodily functions. So, while a 38 is a reduced eGFR for anyone, in an elderly individual, it might reflect a more age-related progression, potentially exacerbated by common causes of kidney function decline such as decades of managing high blood pressure or diabetes. For a younger individual, however, an eGFR of 38 mL/min/1.73m² might prompt a more urgent and thorough investigation into specific underlying conditions that could be causing a more significant or accelerated decline, as natural aging would not typically lead to such a reading at a younger age. Sex also plays a role in the eGFR calculation, as men and women typically have different muscle mass, which influences creatinine levels (a waste product used in the eGFR formula). The formula accounts for these general differences to provide a more accurate estimate for each individual. The '1.73m²' part of the eGFR value helps standardize the result for body surface area, meaning it adjusts the filtration rate so that it can be compared across people of different sizes. This standardization aims to make the number more universal, but still, the context of the individual's overall health picture, including their age and sex, is paramount. The World Health Organization (WHO) emphasizes that individual health assessment must always consider a holistic view. Therefore, an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m² is not a standalone number but part of a larger health narrative unique to each person, especially when considering common causes like long-term health conditions that disproportionately affect certain demographics or age groups.

Medicine Effects on eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m²

When your eGFR (Estimated Glomerular Filtration Rate) is 38 mL/min/1.73m², it's especially important to be aware of how various medications can influence kidney function. Some common medicines, while beneficial for other conditions, can either directly impact the kidneys or affect their ability to filter waste efficiently, potentially leading to further reductions in eGFR. This is particularly true for individuals whose kidneys are already functioning at a reduced capacity, as indicated by an eGFR of 38 mL/min/1.73m². Nonsteroidal anti-inflammatory drugs (NSAIDs) are a prime example. Medications like ibuprofen or naproxen, often used for pain and inflammation, can reduce blood flow to the kidneys, which can be problematic, especially with regular use. Discussing pain management alternatives with your doctor is crucial. Certain blood pressure medications, while essential for managing hypertension (a common cause of reduced eGFR), may need careful monitoring or dosage adjustments when eGFR is at this level. Diuretics, often called 'water pills,' are another class of medications that can affect fluid balance and kidney function. Some antibiotics also require dose adjustments based on kidney function to prevent drug accumulation and potential kidney damage. It's always best to have a comprehensive discussion with your healthcare provider about all medications you are taking, including over-the-counter drugs, herbal supplements, and vitamins. They can review your current prescriptions and make any necessary adjustments to ensure your medications are safe and effective for your eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m². The National Institutes of Health (NIH) provides guidance on medication safety for people with kidney concerns, underscoring the importance of this review. Being proactive in managing your medications can help protect your kidneys and maintain your overall health.

• NSAIDs (e.g., ibuprofen): Can reduce blood flow to kidneys; discuss alternatives.
• Certain blood pressure medicines: May require dosage adjustments or careful monitoring.
• Diuretics ('water pills'): Can impact fluid balance and kidney function.
• Some antibiotics: Doses might need to be adjusted to prevent accumulation.
• Herbal supplements: Can sometimes interact with medications or directly affect kidneys; always disclose to your doctor.

When to Retest eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m²

After receiving an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m², your healthcare provider will likely recommend follow-up testing. The timing and frequency of these repeat tests are not one-size-fits-all; they are carefully determined based on your individual health profile, including the presence of any underlying conditions like high blood pressure or diabetes, which are common causes influencing this result, and your overall health stability. The primary reason for repeating the eGFR test is to monitor trends over time. A single eGFR measurement provides a snapshot, but repeated measurements help paint a more complete picture of how your kidney function is behaving. Is it stable, slowly declining, or improving? This pattern is far more informative than an isolated number. Your doctor will consider factors such as your medical history, any other symptoms you might be experiencing, and the results of additional tests they may have ordered, like urine tests or imaging studies. For an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m², regular monitoring is generally recommended. The Kidney Disease: Improving Global Outcomes (KDIGO) guidelines often suggest more frequent monitoring for individuals with moderately reduced eGFR, especially if there are other risk factors or if the eGFR has shown a rapid decline. This monitoring allows your healthcare team to detect any significant changes early and adjust your management plan as needed. For instance, if subsequent tests show a continued decline, it might prompt a change in medication, a more intensive focus on lifestyle modifications, or a referral to a kidney specialist. Conversely, if the eGFR remains stable or even shows a slight improvement, it can be reassuring and confirm the effectiveness of current management strategies. Ultimately, the decision on when to repeat the eGFR test is a collaborative one between you and your doctor, aiming to best manage your kidney health and overall well-being by understanding the longer-term trajectory of your kidney function.

eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m² — Frequently Asked Questions

When to See a Doctor About eGFR (Estimated Glomerular Filtration Rate) 38 mL/min/1.73m²

Receiving an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m² is a clear signal that it's important to engage with your healthcare provider. This number indicates a moderate reduction in kidney function, and understanding its implications requires professional medical guidance. You should schedule an appointment with your primary care doctor as soon as possible to discuss this specific eGFR result. They will be able to interpret the finding within the context of your overall health history, current medications, and any other symptoms you might be experiencing. Your doctor will likely want to explore potential common causes for this eGFR, such as whether you have high blood pressure, diabetes, or other chronic conditions that can impact kidney health. They may order additional tests, such as repeat blood tests to monitor your eGFR trends, urine tests to look for protein or blood, or imaging studies of your kidneys. Based on these findings, your doctor can then develop a personalized management plan. This plan might involve making specific lifestyle adjustments, modifying current medications, or prescribing new ones. In some cases, especially if your eGFR continues to decline or if there are complex underlying issues, your primary care doctor may recommend a referral to a nephrologist, who is a specialist in kidney diseases. The key takeaway is that an eGFR (Estimated Glomerular Filtration Rate) of 38 mL/min/1.73m² is not a number to ignore. Proactive communication and collaboration with your healthcare team are essential for understanding what this means for you and for taking steps to protect your kidney health and overall well-being.