An intermediate of the methionine-homocysteine pathway.
Cystathionine is an intermediate molecule formed when the body converts the amino acid methionine into cysteine. This pathway also clears homocysteine and depends on vitamin B6. Cystathionine is normally present in blood at low levels.
It is measured as part of a plasma amino acid profile. A raised level can point to a block in the cysteine pathway or to vitamin B6 status. It is read for context within the wider panel rather than as a stand alone test of any single condition.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
| Group | Adult fasting plasma range |
|---|---|
| Adults | 0 to 5 µmol/L |
Amino acid ranges vary by laboratory and method. They are best read as part of the full plasma amino acid profile, not in isolation.
Vitamin B6 status, recent protein intake, fasting state, and time of day affect the result. A fasting morning sample gives the most reliable reading.
Read as part of the full plasma amino acid profile.
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