The normal range of GGT levels varies from person to person, but in adults, GGT levels in the range of 0 to 30 IU/L are normal. Anything above 30 IU/L could be a sign that your liver isn’t working the way it should. However, having a high GGT test result does not necessarily mean you have a medical condition, and approximately one in 20 healthy people will have an abnormal test result. Dangerous GGT levels vary based on factors like age and gender, and specific danger levels are determined by the actual cause and the individuals health. In general, GGT levels that are much higher than the normal range (9-48 U/L) may indicate liver or bile duct issues. If your GGT level is above 50 IU, you might have a problem with your liver, and a higher GGT level indicates greater liver damage. However, high GGT levels alone aren’t enough for your doctor to know if you have liver disease, and doctors often recommend other tests, including one related to alkaline phosphatase (ALP), another enzyme that can build up in your blood if your liver isn’t working well. Therefore, it is important to consult a healthcare professional for proper interpretation and follow-up if you have high GGT levels.