Methylation Panel - Genova Diagnostics

Methylation Index (SAM/SAH Ratio)

Optimal Result: 2.2 - 6.4 micromol/L.

The SAM/SAH ratio is commonly referred to as the “Methylation Index” in the literature and has well- documented clinical associations.

Global methylation is dependent on two key factors: adequate SAM supply and SAH removal.

The SAM/SAH ratio has been proposed to indicate the likelihood of hyper- or hypo-methylation. 

Overall, the SAM/SAH ratio is under tight homeostatic control. SAM levels remain fairly stable due to denovo synthesis and feedback mechanisms. Given this, alterations in the methylation index are more likely a result of SAH fluctuations.

SAH is a potent inhibitor of methyltransferase reactions, which is likely why SAH elevations and a low methylation index are correlated with global hypo-methylation. Furthermore, poor homocysteine clearance contributes significantly to SAH elevations which provides insight into the relationship between these two analytes and cardiovascular disease.

The SAM/SAH ratio is resistant to fluctuations in independent nutrients, given the interconnectedness of the pathways. SAM remains fairly stable due to de novo synthesis and the liver’s tight control over SAM levels. Therefore, is it more likely that SAH variability will lead to alterations in the methylation index.

Methylation reactions become compromised with a decreased SAM/SAH ratio and as SAH levels become elevated. SAM/SAH ratio abnormalities should be addressed by ensuring adequate dietary methyl donor levels (i.e. methionine, SAM-e) and nutritional cofactors required for clearance of SAH and homocysteine (i.e. B6, B12, and folate).

It is important to note that while the Methylation Panel does not directly measure DNA methylation, the SAM/SAH ratio has been shown to correlate with DNA methylation. Many environmental and lifestyle factors have been shown to affect DNA methylation which can turn on/off gene expression. Exposure to tobacco smoke, arsenic, benzene, radiation, lead, cadmium, nickel and asbestos are all tied to DNA methylation defects. Obesity, lack of physical activity, and shift work have also been shown to alter DNA and histone methylation, and thereby gene expression. Chronic alcohol use is another pertinent lifestyle factor to evaluate as it can cause malabsorption of key B-vitamins necessary for methylation.

What does it mean if your Methylation Index (SAM/SAH Ratio) result is too low?

Low SAM/SAH Ratio (SAH elevation):

Check SAH and Homocysteine Levels: If elevated, consider nutritional methylation support:

- Vitamins B12

- Vitamin B6

- Folate

- Zinc

- Other methylation support may be considered as well, especially with low levels of betaine and choline.

What does it mean if your Methylation Index (SAM/SAH Ratio) result is too high?

Elevated SAM/SAH Ratio (SAM elevation):

- Potential Over-methylation: Review genetic markers, such as BHMT, that could lead to higher SAM levels

- Review nutritional supplements that could be contributing to high SAM

- High Protein Intake

- High BMI: Elevated SAM has been correlated to higher BMI, however the degree of impact to SAH is unknown.

If you can test it, we can track it — all test results, including the ones from your favorite labs.

10 000+ happy clients
100% satisfaction
★★★★★ customer support

Essential Plan


  • Monthly subscription
  • Instant interpretation
  • Use the free self-upload form
  • Additional charge for upload service
  • 2000+ biomarkers explained
  • Recommendations
  • Cancel anytime

Advanced Plan


  • Yearly subscription
  • Instant interpretation
  • We upload five reports for you
  • Use the free self-upload form
  • 2000+ biomarkers explained
  • Nutrition Recommendations
  • Online support
  • Cancel anytime

Own It For Life premium plan


  • No subscription
  • Unlimited access
  • Unlimited storage
  • Instant interpretations
  • We upload ten reports for you
  • Use the free self-upload form
  • 2000+ biomarkers explained
  • Nutrition Recommendations
  • Dedicated support

We implement proven measures to keep your data safe.

At HealthMatters, we're committed to maintaining the security and confidentiality of your personal information. We've put industry-leading security standards in place to help protect against the loss, misuse, or alteration of the information under our control. We use procedural, physical, and electronic security methods designed to prevent unauthorized people from getting access to this information. Our internal code of conduct adds additional privacy protection. All data is backed up multiple times a day and encrypted using SSL certificates. See our Privacy Policy for more details.

General Data Protection Regulation (GDPR). HIPAA compliance for healthcare professionals
×

Understand Your Lab Result Now

  • Instant interpretation
  • 2000+ biomarkers explained
  • Science-based recommendations
  • Online support
  • Secure and private portal

Get 10% off with promocode:

;