Interpretation
The Corticosteroid Binding Globulin (CBG) assay is no longer available at Canterbury Health Laboratories. Please contact the Duty Biochemist at
ChemicalPathologists@cdhb.health.nz to discuss alternative assays.
Reference Intervals
300 – 1300 nmol/L normal range. Elevated in pregnancy and oral contraceptive use.
Uncertainty of Measurement:
+/- 100 nmol/L range 0-500 nmol/L
+/- 20% for >500 nmol/L
If cortisol is also requested then the free cortisol index is also reported. Normal 20 – 120.
Reference; Lewis JG, Lewis MG & Elder PA. An enzyme-linked immunosorbent assay for corticosteroid- binding globulin using monoclonal and polyclonal antibodies: decline following synthetic ACTH. Clin Chim Acta; 328: 121-128,2003.