Cofactor for carboxylase enzymes. Deficiency is rare; caused by raw egg consumption, parenteral nutrition without supplementation, or biotinidase deficiency.
| Sex | Age | Range | Notes |
|---|---|---|---|
| All | ≥ 18 yrs | 1 – 1.5 | Approximate reference; varies by assay. Symptoms of deficiency typically at very low levels |
⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.