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THYROID STIMULATING IMMUNOGLOBULIN

Mnemonic

TSI

Specimen Collection Requirements

Collect

Serum, one gold (SST) top tube

Handling

Separate serum from cells and freeze.

Preferred Volume

1.0 mL

Minimum Volume

0.7 mL

Transport

Frozen

Rejection Criteria

Plasma

Stability

AFTER SEPARATION FROM CELLS: Ambient: 24 hours; Refrigerated: 6 days; Frozen: 3 months

Testing Information

Performed

Mon - Sat

Reported

3-6 days

Method

Quantitative Bioassay/Quantitative Chemiluminescence

Referral Lab

ARUP (99430)

Reference Values

Reference Values

Interpretation provided.

Comments

An elevated Thyroid Stimulating Hormone (TSH) value above 76 mU/L may produce a weakly positive Thyroid Stimulating Immunoglobulin (TSI) result (111% or greater).

CPT Codes

84445

Last Updated: Thursday, January 5, 2017 03:41:43 AM


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