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HelpCarbohydrate Deficient Transferrin for Congenital Disorders of Glycosylation, Serum
Additional Codes
LAB961
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
SerumOrdering Guidance
This test is for congenital disorders of glycosylation. If the ordering provider is looking for evaluation of alcohol abuse, order CDTA / Carbohydrate Deficient Transferrin, Adult, Serum.
If either PMM2-CDG (CDG-Ia) or MPI-CDG (CDG-Ib) is suspected, order PMMIL / Phosphomannomutase and Phosphomannose Isomerase, Leukocytes.
Necessary Information
1. Patient's age is required.
2. Reason for testing is required.
Specimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.1 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Specimen Minimum Volume
0.05 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Frozen (preferred) | 45 days | |
| Refrigerated | 28 days | ||
| Ambient | 7 days |
Special Instructions
Reference Values
|
Ratio |
Normal |
Indeterminate |
Abnormal |
|
Transferrin mono-oligo/di-oligo ratio |
≤0.06 |
0.07-0.09 |
≥0.10 |
|
Transferrin A-oligo/di-oligo ratio |
≤0.011 |
0.012-0.021 |
≥0.022 |
|
Transferrin tri-sialo/di-oligo ratio |
≤0.05 |
0.06-0.12 |
≥0.13 |
|
Apo CIII-1/Apo CIII-2 ratio |
≤2.91 |
2.92-3.68 |
≥3.69 |
|
Apo CIII-0/Apo CIII-2 ratio |
≤0.48 |
0.49-0.68 |
≥0.69 |
Day(s) Performed
Monday, Thursday
CPT Code Information
82373
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CDG | CDG, S | 90417-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| BG160 | Reason for Referral | 42349-1 |
| 31721 | Mono-oligo/Di-oligo Ratio | 35469-6 |
| 31720 | A-oligo/Di-oligo Ratio | 35475-3 |
| 34474 | Tri-sialo/Di-oligo Ratio | 90420-1 |
| 34476 | Apo CIII-1/Apo CIII-2 Ratio | 90421-9 |
| 34475 | Apo CIII-0/Apo CIII-2 Ratio | 90419-3 |
| 50820 | Interpretation | 53808-2 |
| 50822 | Reviewed By | 18771-6 |
Report Available
3 to 6 daysSpecimen Retention Time
1 monthForms
1. Congenital Disorders of Glycosylation (CDG, CDGN, OLIGU) Patient Information
2. If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.