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Thyroid Stimulating Immunoglobulin

Referred out for testing

Source Blood
Mnemonic TSIG
Specimen Requirements

1 x 3.5 mL gold top SST tube

Minimum: 0.5 mL serum

CLS staff: Proceed with specimen collection and transport to DSC Accession. DSC Referrals will oversee the physician approval process.

Note to ordering physician: This test requires review and approval by CLS Medical & Scientific Staff.  Please contact CLS Referrals 403-770-3285 for further information on the approval process.

Specimen Handling

PSC & RRL:
Centrifuge, pour off, and transport serum on ice to DSC. Send specimen in a separate bag with a photocopy of the requisition.

Extra-regional:
Centrifuge, pour off, and freeze serum prior to transport to DSC. Send specimen in a separate bag with a photocopy of the requisition.

DSC:
Freeze specimens upon receipt in lab; ensure frozen specimens do not thaw.

Additional Information Test restricted to patients known to have positive results for Thyrotropin Receptor Antibodies.
Testing Location Mayo Clinic
Testing Frequency
Alternate Name(s) LATF (Long Acting Thyroid Stimulating Factor)
Reference Interval