Doctor's Data Inc

Methylation Profile; plasma

Normal metabolism of methionine is critical for cellular methylation of DNA, proteins and neurotransmitters. Aberrant methionine metabolism can occur in anyone at any age and can be associated with numerous health consequences including cardiovascular disease and cancer. The Methylation Profile provides a functional assessment of the phenotypic expression of common SNPs (MTHFR, MS, CBS) by evaluating the plasma levels of methionine, cysteine, SAM, SAH, homocysteine and cystathionine, and provides the important "methylation index," a ratio of SAM to SAH.
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Turnaround Time

5 to 7 days

Analytes Tested

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Analyte CPT ABN Required
Cystathionine; plasma 82136 No
Cysteine; plasma 82136 No
Homocysteine; plasma 82136 No
Methionine; plasma 82136 No
S-adenosylhomocysteine; plasma 82542 Yes
S-adenosylmethionine; plasma 82542 Yes
SAM, SAH ratio No

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Prompt payment pricing applies when billing to a physician account or prepayment is received with the test.

Doctor's Data offers profiles containing multiple analytes. *Multiple analytes may be billed under a single CPT code. Many analytes can be ordered individually. Pricing may vary. Click on a specific analyte for more information or read our detailed billing and payment policies.

The CPT codes listed on our website are for informational purposes only. This information is our interpretation of CPT coding requirements and may not necessarily be correct. You are advised to consult the CPT Coding Manual published by the American Medical Association. Doctor's Data, Inc. takes no responsibility for billing errors due to your use of any CPT information from our website.

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This test is useful for

  • Autism
  • Birth Defects
  • Cancer
  • Cardiovascular Disease
  • Congenital Heart Disease
  • Detoxification Impairment
  • Down Syndrome
  • General Health and Longevity
  • Genetic Disorders
  • Immune Dysfunction
  • Neurodegenerative Diseases
  • Nutritional Deficiencies
  • Psychiatric Disorders

Detailed Information

Normal methionine metabolism is absolutely critical for folate-dependent transmethylation and transsulfuration. Abnormal metabolism of methionine can be found in both genders at any age. It is usually associated with genetic or nutritional deficiencies, aging and exposures to environmental toxins. For example, lead can impair methylation via inhibition of the enzyme methylene-tetrahydrofolate reductase (MTHFR).
Conditions associated with untreated, aberrant methionine metabolism include, but are not limited to:

•  Abnormal neurotransmitter metabolism and psychiatric disorders such as schizophrenia    and bipolar disorder •  Neurodegenerative diseases •  Autism •  Dysregulation of nitric acid homeostasis •  Oxidative stress •  Global under-methylation, synthesis and repair of DNA •  Immune dysregulation/autoimmunity •  Cancer •  Cardiovascular disease •  Congenital heart disease and birth defects •  Impaired endogenous detoxification processes •  Increased risk for Down syndrome.
Methylation Methionine is first enzymatically converted to S-adenosylmethionine (SAM), the principal methyl donor for methylation of DNA, RNA, protein, phospholipids, creatinine and neurotransmitters. S-adenosylhomocysteine (SAH) is generated as a product of transmethylation and is hydrolyzed to homocysteine (Hcy) and adenosine through a reversible reaction. SAH is a potent inhibitor of methylation reactions. Efficient removal of adenosine and Hcy is imperative to prevent accumulation of SAH. Hcy is normally removed or recycled by remethylation to methionine through a series of reactions that require 5-methyltetrahydrofolate, B12 and betaine to complete the normal methylation cycle. A low ratio of SAM to SAH is a sensitive indicator of under-methylation. Elevated plasma Hcy is an independent risk factor for cardiovascular disease (CVD). Recent research suggests that elevated SAH may be an even better predictor of risk for CVD. Transsulfuration: Methionine > Homocysteine > Cysteine The methionine transsulfuration pathway occurs primarily in the liver and diverts Hcy away from remethylation to methionine toward synthesis of the conditionally essential amino acid cysteine. Homocysteine in the presence of serine and B6 is enzymatically converted to cystathionine and ultimately cysteine. Cysteine is the rate-limiting amino acid in the biosynthesis of quintessential glutathione (GSH). GSH is pivotal in the regulation of intracellular redox homeostasis, oxidative stress, immune function, DNA synthesis and repair, apoptosis and detoxification of metals and chemicals. The DDI Methylation profile evaluates the plasma levels of methionine, cysteine, SAM, SAH, Hcy and cystathionine, and provides the important "methylation index," a ratio of SAM to SAH. The test results can appropriately guide nutritional support to improve or normalize methionine metabolism and meliorate or prevent the potential adverse consequences associated with inadequate methylation and transsulfuration capacity.

Environmental Exposure and Detoxification

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