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TSH Blood Spot
Test Code: BST
Special instructions
Minimum of two 8mm blood spots on bloodspot (Guthrie) card. Clearly mark for 'bloodspot TSH' on card.
Sent away
to Southmead Hospital
Contact Laboratory before requesting
Reference range
Reference range <2.2 mU/L. Bloodspot is approximately 50% less than serum TSH.
Units
mU/L
Linked to
TSH
Turnaround Time
14
days
Department: Biochemistry
Clinical Application
Monitoring patients with Down syndrome or needle-phobia, to screen for primary hypothyroidism or detect under replacement with thyroxine. Limited to TSH measurement. Will not detect pituitary dysfunction and is not precise at low levels of TSH. Always confirm diagnosis with full venous thyroid profile if results fall outside of reference range.
Webpage updated: April 2024.
