Affinity Chromatography / Mass Spectrometry
Screening test for congenital disorders of glycosylation. Note that a positive test could be due to a genetic or non-genetic condition. Reports of abnormal results will include recommendations for additional biochemical and molecular genetic studies to more precisely identify the correct form of CDG.
Transferrin Mono-oligo/Di-oligo Ratio: <or= 0.06; Transferrin A-oligo/Di-oligo Ratio: <or= 0.011; Transferrin Tri-sialo/Di-oligo Ratio: <or= 0.05; Apo CIII-1/Apo CIII-2 Ratio: <or= 2.91; Apo CIII-0/Apo CIII-2 Ratio: <or= 0.48.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Other conditions such as hereditary fructose intolerance, galactosemia, and liver disease may result in increased levels of carbohydrate deficient transferrin. Relevant clinical information and the indication for the analysis should be provided with the specimen, in particular for nonpediatric patients.
Days Test Performed
Soft Order Code
CDT for Congenital Disorders of Glycosylation (Sendout)
CDT Congen Disord Glycosylatio
Mono-oligosaccharide/Di-oligosaccharide transferrin ratio
A-oligosaccharide/Di-oligosaccharide transferrin ratio
Mayo CDG (89891)
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Offsite Collection Instructions
Collect specimen in red top or SST tube. Centrifuge, aliquot serum into a plastic vial and freeze.
0.2 mL serum
0.1 mL serum
Test sent to Mayo Medical Laboratories.