IgG is an abbreviation for Immunoglobulin G, which is a type of antibody that plays a key role in the body's immune system. The normal range for an IgG level is typically 7-15.5 grams per liter (g/L). Variations in the normal range may be due to age, sex, and other factors.
Factors that Affect IgG Levels
Age: IgG levels tend to decrease with age. In infants, the level is usually highest, and it begins to decline at age two. By age four, it has usually reached its adult range.
Sex: IgG levels are generally higher in males than females.
Medication: Certain medications, such as steroids, can affect IgG levels.
Disease: Certain diseases, such as cancer and HIV, can affect IgG levels.
Testing for IgG Levels
Testing for IgG levels is done through a blood test. The test measures the amount of Immunoglobulin G in your blood. Your doctor may order the test if they suspect you may have a problem with your immune system or if they want to monitor your response to treatment.
Treating Low IgG Levels
If your IgG level is low, your doctor may recommend treatment, depending on the underlying cause. Treatment options may include medication, lifestyle changes, or a combination of both. Your doctor can help you decide what treatment is best for you.