Thyroid-Stimulating Hormone (TSH)
Clinical Biochemistry
Sample and container requirements
Serum Lithium Heparin Plasma (paediatrics only)
Minimum volume required
Special requirements
None
Patient preparation
None
Sample viability
Turnaround time
This assay is run throughout the day and night. The in-lab turnaround time is normally less than 24 hours.
Reference range
0.4 – 4.9 mIU/L In pregnancy: Trimester 1: 0.0878 – 2.8293 mIU/L Trimester 2: 0.1998 – 2.7915 mIU/L Trimester 3: 0.3070 – 2.9028 mIU/L (Source: Abbott Diagnostics)
Clinical guidance
Thyroid-stimulating hormone (TSH) measurement is a front line test for assessment of thyroid function. It can also be used to monitor therapy in hypothyroidism and hyperthyroidism. Please refer to LabTestsOnlineUK to learn more about TSH. https://labtestsonline.org.uk/tests/thyroid-stimulating-hormone-tsh
Notes
Images to go here
This information was last updated on 19 August 2026