Gamma-Glutamyl Transferase

Gamma-Glutamyl Transferase (GGT) is a liver biomarker expressed as a measurable laboratory value. It describes a liver-related aspect of the body.

Gamma-Glutamyl Transferase is measured from a serum sample, collected through a blood test. Fasting is not required for this measurement, so the test does not require fasting preparation on its own.

Results are interpreted using the test’s reference interval, with lower values considered preferable for this marker. The relevant interval can differ by sex, so the laboratory’s accompanying range matters when reading the result. Gamma-Glutamyl Transferase may also be considered alongside related markers such as Alt, Ast, and Alp, allowing the result to be viewed in a broader panel rather than in isolation.

When arranging testing, confirm that the laboratory will report the result with its applicable reference interval and that any related tests being ordered have been considered. A clinician can help interpret the combined findings in the context of an individual’s health.

Interpret Gamma-Glutamyl Transferase in U/L against the reference range shown on the same report. The reference range is the broader interval used for comparison, while the optimal range is a tighter interval within it. Because lower values are considered better for this biomarker, a result’s position within these intervals matters more than the number viewed on its own.

The applicable range can also differ by sex: the listed male and female ranges are not identical. The sample type for this measurement is serum, and fasting is not required. A single value should be considered in context rather than treated as a diagnosis. Results outside the reference range should be discussed with a clinician, who can interpret them alongside the reason for testing and other relevant clinical information.

Gamma-Glutamyl Transferase is lower-is-better in this context. Trials measured this marker directly for all of the interventions below. Decreases were reported with Omega-3, Coenzyme Q10, Quercetin, Milk Thistle (Silymarin), Reishi, Panax Ginseng, Curcumin, and Berberine. The size and consistency of these changes varied, and a reported decrease does not by itself establish that an intervention is appropriate for a particular person or condition.

Resveratrol moved Gamma-Glutamyl Transferase upward in the measured studies. Alpha-Lipoic Acid (ALA), Melatonin, Krill Oil, Beta-Alanine, Garlic, and Black Seed Oil were reported as unchanged. These findings describe marker movement in the studied settings rather than a general prediction for every person, product, or dose.

Study rechecks ranged from 4.3 to 56.0 weeks, with many occurring at 12.0 weeks. The evidence includes both pooled analyses and individual controlled trials, so results differ in scope and certainty. Gamma-Glutamyl Transferase can be interpreted alongside the broader clinical picture; anyone considering changes related to a medical condition should discuss the findings with a clinician.