Gamma-glutamyl transferase (GGT) is an enzyme found in the kidneys, liver, spleen, gallbladder, and pancreas. It provides information about liver health. The GGT enzyme is frequently analyzed in blood tests, particularly those used to assess liver function. Although it is generally associated with the liver, elevated levels may also be observed in the gallbladder and pancreas. An increase in GGT levels in the blood—an enzyme that should be present in only small amounts in the blood of healthy individuals—is one of the topics under investigation.
GGT may also be present in other organs, albeit in small amounts. There are many types of enzymes in the human body. These enzymes help maintain the body’s functions and natural processes. GGT, one such enzyme, is normally found inside cells. When cell damage occurs due to a specific cause, the enzyme may be released outside the cells, leading to an increase in the enzyme level in the blood.
Why Is the Gamma-Glutamyl Transferase Test Performed?
The gamma-glutamyl transferase test is one of a series of blood tests frequently performed to investigate potential diseases of the liver and biliary tract. It is considered a sensitive measure for detecting biliary tract disorders.
Certain liver-related issues can also cause an increase in GGT levels. For this reason, elevated GGT levels are not considered a problem in and of themselves. The reasons for performing the GGT test are as follows:
- To detect liver disorders
- To determine whether there is a blockage in the bile ducts
- To determine the cause of liver damage
- Research related to alcohol consumption or addiction treatment
- Investigating potential side effects of medications
- Research into the causes of symptoms such as loss of appetite, weakness, pale stools, itchy skin, dark urine, stomach problems, and vomiting
The GGT test is performed like a standard blood test, and the levels of many liver enzymes can be determined using a blood sample taken from the patient.
What Should the Gamma-Glutamyl Transferase (GGT) Level Be?
The normal range for GGT levels in the blood may vary depending on the person’s age and gender. While reference ranges may differ based on the procedures followed at the laboratory where the test is performed, GGT levels are typically reported as 0–45 U/L for adult women and 0–65 U/L for men.
Since nearly all of the enzyme is found inside cells in healthy individuals, the absence of the enzyme in the blood is considered a perfectly normal and healthy condition. In some cases, the presence of a small amount of GGT enzyme in the blood—resulting from cellular renewal—is also considered normal. In cases where levels exceed the reference ranges provided above, the GGT enzyme must definitely be investigated
.
What Is Elevated Gamma-Glutamyl Transferase?
Elevated GGT levels are reported when the value exceeds 45 for women and 65 for men. While there may be many causes for these conditions, it is generally not possible to diagnose certain diseases based solely on GGT levels.
Alcohol consumption prior to the test can cause GGT levels to appear elevated. Therefore, he should avoid drinking alcohol for one day before the test.
While liver and bile duct problems are among the common causes of elevated GGT, certain medications, excessive alcohol consumption, or some diseases can also cause changes in enzyme levels.
Obtaining a detailed medical history from the patient is the first step in determining and evaluating GGT levels. Subsequently, the results can be interpreted in terms of elevated levels by also examining the values of other liver enzymes.
The most common causes of elevated gamma-glutamyl transferase levels are as follows:
- Alcohol consumption
- Liver infection
- Liver cancer
- Fatty liver
- Blockage of the bile ducts
- Pancreatitis
- Diabetes
- Heart failure
- Side effects of certain medications
How Can Elevated Gamma-Glutamyl Transferase Levels Be Reduced?
First, the health issues causing this elevated level must be identified and resolved. Elevated GGT levels alone are not considered sufficient to diagnose a person’s underlying health problems.
By also examining the levels of various liver enzymes, the individual’s medical conditions and the medications he is taking should be thoroughly evaluated.
In addition to blood tests, various imaging methods—such as different urine tests, ultrasound, MRI, and CT scans—are important for visualizing the liver and gallbladder to identify potential diseases.
Elevated Gamma-Glutamyl Transferase (GGT) Results
Conditions such as liver damage, fatty liver, or gallstones can be detected through a simple ultrasound examination. If deemed necessary, advanced diagnostic tests such as a biopsy may also be performed to confirm the diagnosis and plan treatment.
The level of the enzyme entering the bloodstream due to damage to the liver or gallbladder can be reduced once the damage to the organs is resolved. Therefore
, the health issues causing elevated GGT levels must be identified, and the treatment process should be initiated alongside measures to address these issues. By resolving the underlying issues causing the elevated enzyme levels, GGT and other enzyme levels can return to normal. If individuals who have had a blood test notice that their GGT levels are high in the results, they should consult a doctor and seek information about the causes of this condition. Through the diagnostic and screening procedures deemed necessary by the doctor, diseases can be diagnosed and treated early.