TyG Index (Triglyceride-Glucose Index)
Here’s what it reflects — and what to do about it.
Longetic pulls together every lab and record you’ve had, follows how TyG Index (Triglyceride-Glucose Index) changes over time, and explains what’s shifting — so you walk into your next appointment prepared, with reminders for retests along the way.
What is TyG Index (Triglyceride-Glucose Index)?
A calculated index combining fasting triglycerides and fasting blood sugar, used as a simple surrogate for insulin resistance.
TyG is a calculated value, not a separate test: it is the natural logarithm of your fasting triglycerides multiplied by your fasting glucose, divided by 2 - Ln of (fasting TG times fasting glucose, divided by 2). A higher TyG index can be associated with greater insulin resistance and metabolic risk, a lower value can be associated with better insulin sensitivity. It is a screening-style estimate, not a diagnosis.
What to know about TyG Index (Triglyceride-Glucose Index)
Understanding TyG Index (Triglyceride-Glucose Index) means knowing what it reflects, what tends to move it, and the signs that suggest it’s worth a closer look — so you can bring the right questions to your next appointment.
This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Medical Disclaimer.
References
About our sources
Official sources
Government health agencies, national institutes, and intergovernmental bodies whose guidelines carry regulatory or policy weight.
Clinical / professional
Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.
Peer-reviewed research
Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.