Quick Reference
- Full form
- Thyroid Stimulating Hormone
- Sample type
- Blood
- Fasting
- Not required
- Marker measured
- 1
- Report turnaround
- Same day
- Available at
- All locations
About Serum TSH
TSH is the single most sensitive marker for thyroid function, often the only test needed for routine thyroid screening before deeper investigation with T3 and T4 is considered.
No fasting is required, and results are available the same day.
How to Prepare
- No fasting required.
- No special preparation needed before your blood draw.
Frequently Asked Questions
Why is TSH considered the most sensitive thyroid marker?
It responds to even small changes in thyroid hormone levels before other markers shift, making it the go-to screening test.
Do I need to fast before this test?
No fasting is required.
Is TSH enough on its own for thyroid screening?
For many routine checks, yes, though your doctor may add T3 and T4 if TSH is abnormal or symptoms persist.
What symptoms suggest TSH testing?
Unexplained weight changes, fatigue, or feeling unusually cold or hot are common reasons for this test.
How soon will my report be ready?
Same day.
Is home sample collection available?
Yes, in all City Care Lab service areas.
This page provides general health information and is not a substitute for medical advice. Speak with your doctor about your specific results and treatment.