A 101 Guide to Kidney Function Tests: Types, Results & Follow-Up
The kidneys help to keep the body healthy by filtering out waste, balancing fluids, and regulating blood pressure. Several health problems arise whenever kidney functions go awry. Kidney function tests (KFTs) help determine how well the kidneys are working and detect early signs of kidney disease. This guide explains the different types of tests for kidney function, what the results mean, and what to do after the tests. Why Are Kidney Function Tests Important? Kidney diseases, very often, go on for a long time without manifesting clinical symptoms. Generally, by the time symptoms appear, there might be severe damage to the kidney. Thus, periodical testing for the kidneys helps in the early detection of kidney problems for their better management and treatment. More updates with our platforms like Instagram, Facebook, Twitter and LinkedIn. Who Should Get a Kidney Function Test? A doctor may recommend KFT for you if you have: High blood pressure or diabetes Family history of kidney disease Swelling in legs, face, or hands Frequent urination or trouble urinating History of kidney stones Types of Kidney Function Tests 1. Blood Tests These tests measure substances in the blood that define kidney function. a) Serum Creatinine Test Creatinine is a waste product from muscle breakdown. If the level of creatinine is raise, it indicates a poor function of the kidney. Normal range for men: 0.7 to 1.3 mg/dL Normal range for women: 0.6 to 1.1 mg/dL b) Blood Urea Nitrogen (BUN) Test The BUN level assesses urea, the waste product of protein breakdown. An elevated BUN may indicate kidney dysfunction or dehydration. Normal range: 7 to 20 mg/dL More updates For: Tuberculosis TB Causes Symptoms and Treatment Options c) Estimated Glomerular Filtration Rate (eGFR) eGFR is a measure of how well blood passes through the kidneys. Low eGFR values are suggestive of reduced kidney functioning. Above 90 = Healthy kidneys 60-89 = Mild kidney damage Below 60 = Possible kidney disease 2. Urine Tests Urine tests indicate kidney damage by measuring protein, blood, and waste products. a) Urinalysis This test looks for the presence of protein, blood, and glucose in urine. Protein in urine (proteinuria) may be an indicator of kidney disease. b) Albumin-to-Creatinine Ratio (ACR) Test ACR is the measurement of albumin (a type of protein) in urine. An increased ACR indicates kidney damage. Normal ACR: Less than 30 mg/g c) 24-hour Urine Test This test examines the urine collected over 24 hours to measure kidney filtration. It helps check creatinine clearance and protein levels. 3. Imaging Tests Imaging studies may enable physicians to assess the structure and morphology of the kidneys and make identifiable abnormalities. a) Ultrasound Ultrasound helps to discover renal stones, cysts, or any obstructions. It offers an uneventful and pain-free experience. b) CT Scan or MRI Both modalities demonstrate a beautiful picture of the kidney to highlight any abnormality. Furthermore, contrast dye is sometimes used; however, it is not always suitable for those with kidney problems. 4. Kidney Biopsy The sample of tissue is small and taken out during kidney biopsy for detailed observation. This is relied on when other investigations yield inconclusive results. Understanding Test Results Serum Creatinine Elevated creatinine levels possibly indicate kidney dysfunction, dehydration, or a high-protein diet. Lower levels, however, are generally not to be concerned with. BUN (Blood Urea Nitrogen) Elevated BUN levels can develop due to kidney disease, dehydration, or excessive protein intake. Usually, low levels are not problematic. eGFR (Estimated Glomerular Filtration Rate) A lower eGFR value indicates reduced kidney function. If eGFR is less than 60, further tests will be done to confirm kidney disease. ACR (Albumin-to-Creatinine Ratio) A high level of ACR means probable kidney damage; thus may require lifestyle changes or medical treatments. Urinalysis Protein or blood found in the urine would suggest kidney disease, and/or infections. Further tests will be necessary to establish the reason. If any values are abnormal, doctors may call for follow-up tests for confirmation. What to Do If Your Kidney Test Results Are Abnormal? 1. Repeat the Test A single abnormal test does not mean a person has kidney disease; often it may be repeated after weeks. 2. Identify the Cause Results may be altered by several factors, such as protein intake, dehydration, or drugs. Correcting these factors may restore renal function. 3. Lifestyle Changes to Support Kidney Health Hydration: Drink enough water to support kidney filtration. Eat a Kidney-Friendly Diet: Reduce salt, processed foods, and high protein intake. Control Blood Sugar and Blood Pressure: Diabetes and hypertension damage kidneys. Avoid Overuse of Painkillers: NSAIDs (e.g., ibuprofen) can harm kidneys over time. 4. Follow Up with a Nephrologist (Kidney Specialist) If kidney function is declining, a nephrologist can recommend treatment. Early intervention prevents kidney failure. Conclusion Kidney Function Tests Aid Early Detection and Notification. Blood Tests, Creatinine, BUN, and Urine Tests, ACR, Urinalysis-New Detects Any Problem Relating to Kidney Early Treatment and Lifestyle Modification. If you have risk factors such as diabetes or high blood pressure, make sure you have a family history of kidney disease: need to get tested regularly. Protecting your kidneys involves some minor lifestyle modifications and treatment in the early stages. Frequently Asked Questions (FAQs) Q1. How often should I get a kidney function test? If you have no risk factors, a kidney test every 1-2 years is enough. If you have diabetes, high blood pressure, or kidney disease, your doctor may recommend testing every 3-6 months. Q2. Can kidney function improve? Yes! Making healthy changes, like controlling blood sugar, eating a balanced diet, and staying hydrated, can help slow down kidney disease and improve function. Q3. What are the early signs of kidney disease? Early kidney disease often has no symptoms. In later stages, symptoms may include swelling, fatigue, frequent urination, and difficulty concentrating. Q4. What foods are good for kidney health? Healthy foods for kidneys include berries, leafy greens, fish, whole grains, and nuts. Avoid excessive salt, processed foods, and high-protein diets. Q5. Can dehydration affect kidney test results? Yes! Dehydration can
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