Total-to-HDL Cholesterol Ratio
The Castelli index compares total cholesterol to protective HDL cholesterol to assess overall vascular lipid balance.
Test your personal value
Enter the number from your lab report to instantly see how it compares to reference ranges.
Physiological Reference Ranges
The ranges below represent standard adult physiological values. Your laboratory's printed reference range always takes precedence.
2.5 – 4.5 ratio
2.5 – 4 ratio
2.5 – 4.5 ratio
What does a low result mean?
A ratio below 3.5 is optimal and reflects a plentiful proportion of arterial-protective HDL.
What does a high result mean?
A slightly higher ratio encourages boosting HDL through regular aerobic workouts, olive oil, and nuts.
Questions ready for your doctor
Bring these questions to your next consultation to discuss with your healthcare practitioner:
- Does this ratio demonstrate a favorable balance between protective and circulating lipids?
- What forms of physical activity best boost protective HDL?
- Is a follow-up assessment in 6 months suggested?
Do you have a full blood test report?
Upload your lab document (PDF or image) to get an instant, clear explanation for every biomarker at once.
Important information — Medical notice
ScanMyLab is for informational purposes only. It does not provide a diagnosis and never replaces the advice of your doctor or laboratory.