Immunoglobulin G (IgG) Urine Mass Concentration

Your doctor may order this test if you have signs of possible kidney problems, such as protein in your urine, swelling in your legs or around your eyes, or abnormal findings on earlier urine tests. It can also be used to monitor conditions that affect kidney filtering, including diabetes, high blood pressure, autoimmune diseases, and certain blood or immune disorders.

Your healthcare provider may recommend this test if you have symptoms like frequent urination, swelling, or if they suspect conditions such as kidney disease, diabetes, or immune disorders. It can also be part of a broader evaluation for unexplained protein in urine.

Before the test, tell your doctor about all medications, vitamins, and supplements you take, since some drugs can affect the results. You may be asked to avoid vigorous exercise for a day or so beforehand. Depending on the sample your doctor needs, you may provide a single urine sample at the clinic or collect all of your urine over a 24-hour period at home using a special container.

No special preparation is usually needed. You may be asked to collect a urine sample at home or in a lab. If you’re using certain medications or have kidney-related conditions, let your provider know beforehand.

This test measures the amount of IgG, a large antibody protein that is part of your immune system, in your urine. Healthy kidneys normally keep proteins like IgG from passing into the urine. A laboratory analyzes your sample with specialized methods to detect and measure how much IgG is present, which helps show how well the kidney filters are working.

A sample of your urine is analyzed to measure IgG levels. The test detects the presence and concentration of antibodies that may appear in urine due to kidney filtration issues or immune responses.

Your results will show whether the amount of IgG in your urine is within the normal range or higher than expected. Higher levels can mean the tiny filters in your kidneys are more leaky than usual, which may occur with kidney inflammation, diabetes-related kidney damage, or certain immune and blood disorders. Your doctor will interpret the results together with your symptoms, medical history, and other test findings.

Results are typically reported as a mass concentration (e.g., mg/dL or mg/L). Elevated levels may indicate conditions like nephrotic syndrome, certain infections, or immune system dysfunction. Lower-than-expected levels might suggest kidney disease or other metabolic issues.