Reference Interval:
Effective November 7, 2011
| Negative
| 110% basal activity or less
| | Positive
| 111% basal activity or greater
|
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| Interpretive Data: |
Positive results (111 percent or greater) are consistent with Graves disease but do not always correlate with the presence and severity of hyperthyroidism. Antibodies to the Thyroid Stimulating Hormone Receptor (TSHR) may be stimulating, blocking, or neutral. Stimulating antibodies mimic the action of TSH and cause hyperthyroidism (Graves disease). This test determines the net effect of all TSHR antibody types present in the serum specimen.
|
| Note: |
An elevated Thyroid Stimulating Hormone (TSH) value above 76 mU/L may produce a weakly positive Thyroid Stimulating Immunoglobulin (TSI) result (111 percent or greater).
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| CPT Code(s): |
84445
|
Cross References: |
TSI (Thyroid Stimulating Immunoglobulin) |