Immunoglobulin G, subclass 4

Alphabetical Test listing

Immunoglobulin G, subclass 4-994

Test name:

Test number:

994

Excellian order number:

LAB994

Abbreviation:

MSO

Alternate names:

IgG Subclass 4, IgG4

Useful for:

Evaluation of sinopulmonary infections, asthma
Immunotherapy hyposensitization
Evaluate allergies

Specimen type:

Serum

Collection container:

Gold serum separator (SST) tube

Volume:

1.0 mL

Minimum volume:

0.4 mL

Collection instructions:

Immediately following collection, thoroughly mix sample by gently inverting 5 times

Processing instructions:

Allow sample to clot for a minimum of 30 minutes
Spin within two (2) hours of sample collection
Transfer serum to a Transfer vial/tube with cap - 12mL (LabCorp), labelled as serum

Transport container:

Transfer vial/tube with cap - 12mL (LabCorp)

Alternate collection container:

Red serum vial/tube, 5 mL

Transport and stability:

Refrigerated (preferred) - 14 days

Ambient - 3 days

Frozen - 14 days

Freeze/thaw cycles - stable x3

Reason for rejection:

Gross lipemia
Hemolysis

Performing lab:

LabCorp Burlington (160531): R-NX

Days set up:

Daily

TAT:

3 - 6 days

Method:

Immunologic

Reference ranges:

See report

CPT codes:

82787

Date created:

05/29/2019

Revised date:

12/20/2025

Review date:

12/20/2025