Know Your Blood Parameter: Thyroid Stimulating Hormone (TSH)

1. Parameter Name 

   Thyroid Stimulating Hormone (TSH)

   
   

2. Test Type 

   Blood

   
   

3. Normal Range 

   0.4 – 4.0 mIU/L

   
   

4. High Levels Indicate 

   Underactive thyroid (primary hypothyroidism), Hashimoto’s disease, iodine deficiency.

   
   

5. Low Levels Indicate 

   Overactive thyroid (hyperthyroidism), pituitary gland problems, or medication effects.

   
   

6. Why It's Tested 

   Primary screening test for thyroid disorders; reflects thyroid-pituitary feedback.

   
   

7. Associated Symptoms (if abnormal) 

   High: Fatigue, weight gain, slow heartbeat 

   Low: Sweating, anxiety, fast heartbeat

   
   

8. What To Do If Abnormal 

   Correlate with T3, T4; initiate thyroid hormone therapy or antithyroid meds as needed.

   
   

9. Common Conditions Related 

   Hypothyroidism, hyperthyroidism, thyroid nodules

   
   

10. Nutrition or Lifestyle Connection 

    Maintain adequate selenium and iodine; avoid excessive soy or raw cruciferous veggies.

    
    

11. References (APA Format) 

    • American Thyroid Association. (2023). 

    • MedlinePlus. (2023). TSH test. 

    • Mayo Clinic. (2022).