The oxidised, transportable form of the amino acid cysteine.
Cystine is the form taken by two cysteine molecules joined together. Cysteine is an amino acid used to build proteins and to make glutathione, an important antioxidant. In blood, much of the body's cysteine circulates as cystine.
It is measured as part of a plasma amino acid profile. Levels reflect sulphur amino acid metabolism and antioxidant pathways. A clearly raised result can point to cystinuria, an inherited condition that causes kidney stones, and is interpreted alongside the rest of the panel.
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 | 5 to 60 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.
Recent protein intake, fasting state, time of day, and delays in processing the sample 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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