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Test Name:
IgA Subclasses 1 and 2 (Includes Total IgA)
- SBMF No:
43007 - Performance Lab Name:
Quest Diagnostics Nichols Institute - Test Mnemonic:
IGASUB 1/2 - ABN:
Not required - CPT Code:
82784; 82787x2 - LOINC Code:
19146-0 - Ref Lab Test No:
1931 - Test Includes:
IgA Subclass 1
IgA Subclass 2
Total IgA - Spec Type:
Serum - Spec Container:
Gold top (SST) or red top (serum) tube - Pref Vol:
2.0 mL - Min Vol:
1.0 mL - Fasting:
No - Spec Collect:
Routine venipuncture - Spec Process:
Clot 30 minutes
Promptly centrifuge 15 minutes
Immediately transfer serum to separate plastic tube - Spec Store Transport:
Refrigerated - Spec Stability:
3 days room temperature (20-30C)
1 week refrigerated (2-8C°C)
2 months frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles - Methodology:
Nephelometry
Turbidimetry - Use:
Approximately 10 to 15% of serum immunoglobulin is IgA, which contains 10% carbohydrate, and has a half-life of 6 days. About 10 to 15% of IgA in serum in polymeric, particularly IgA2, which is more resistant to destruction by some pathogenic bacteria than is IgA1. This test Identifies and quantitates IgA subclasses 1 and 2. - Reference Range:
- IgA Subclass 1
- 98.6 - 353.1 mg/dL
- IgA Subclass 2
- 11.6 - 78.5 mg/dL
- IgA Total
- < 2 months: 2 - 43 mg/dL
< 6 months: 3 - 66 mg/dL
< 10 months: 7 - 66 mg/dL
< 13 months: 12 - 75 mg/dL
< 4 years: 24 - 121 mg/dL
< 7 years: 33 - 235 mg/dL
< 10 years: 41 - 368 mg/dL
< 12 years: 64 - 246 mg/dL
< 14 years: 70 - 432 mg/dL
< 16 years: 57 - 300 mg/dL
≥ 16 years: 81 - 463 mg/dL
- Additional Test Info:
Please provide patient age to allow reporting of age-specific reference ranges. - Day Run:
Wed, Fri - Time Reported:
Same day
This is a sendout test. Please note that turnaround time is defined as the anticipated time from set up day to results release. - Test Type:
IMMUNOLOGY
