Pathology Handbook

Alpha Subunit of TSH

Synonyms

ASU

Clinical Indications

The measurement of alpha subunit of TSH is helpful in distinguishing between a TSH-secreting pituitary adenoma and thyroid hormone resistance in patients with a high TSH and FT4. TSH-secreting adenomas are rare and make up 1% of pituitary tumours

Part of Profile

N/A

Request Form

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Availability

On request, but for Endocrinology Consultants only

Specific Criteria

None

Turnaround Time

Two weeks

Specimen

Serum in red-top vacutainer

Volume

1 ml

Container

Vacutainer red top

Collection

No specific collection conditions
Sent to the Queen Elizabeth Hospital Birmingham, B15 2WB  

Causes for Rejection

Unlabelled or incorrectly labelled sample; not meeting specific criteria for analysis

Reference Range

Adult (male & female) < 1IU/L

Post-menopausal & mid cycle <3 IU/L