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🧪 What is Ultra-Sensitive TSH?

The Ultra-Sensitive TSH test is a highly precise assay that measures very low concentrations of Thyroid Stimulating Hormone (TSH) in the blood. It allows detection of subtle changes in thyroid function and is useful for early diagnosis and fine monitoring.

❓ Why is the Test Done?

To:

Detect mild or subclinical hypothyroidism or hyperthyroidism
Monitor patients on thyroid hormone replacement therapy or antithyroid medications
Screen for thyroid dysfunction in sensitive clinical situations
Assess risk of thyroid disease in pregnancy or elderly

📊 Normal Range

Ultra-Sensitive TSH Level	Reference Range
0.4 – 4.0 mIU/L	Typical reference range

Values below or above this range indicate hyper- or hypothyroidism respectively.

📈 Interpretation of Results

TSH Level	Clinical Significance
< 0.4 mIU/L	Suggests hyperthyroidism or suppressed TSH
0.4 – 4.0 mIU/L	Normal thyroid function
> 4.0 mIU/L	Suggests hypothyroidism or insufficient thyroid hormone

🧠 Associated Conditions

Condition	Details
Subclinical hypothyroidism	Elevated TSH with normal thyroid hormone levels
Subclinical hyperthyroidism	Low TSH with normal thyroid hormone levels
Overt hypothyroidism	Elevated TSH with low thyroid hormone levels
Overt hyperthyroidism	Suppressed TSH with high thyroid hormone levels

🔄 Related / Follow-Up Tests

Free T4 and Free T3
Thyroid autoantibodies (Anti-TPO, Anti-TG)
Thyroid ultrasound

✅ Fasting Required?

Test	Fasting Required
Ultra-Sensitive TSH	❌ No

📝 Summary Table

Parameter	Details
What	Highly sensitive assay to measure TSH levels
Why	Detect subtle thyroid dysfunction
Normal Range	0.4–4.0 mIU/L
Low TSH	Hyperthyroidism or suppressed TSH
High TSH	Hypothyroidism or insufficient hormone
Associated Conditions	Subclinical and overt thyroid diseases
Follow-up Tests	Free T4, Free T3, thyroid antibodies
Fasting Required	❌ No

TSH Ultra Sensitive

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