Question
What is the best and most sensitive investigation for hypothyroidism?
The correct answer is
TSH levels
Hypothyroidism Investigation Sensitivity
The most sensitive investigation for diagnosing hypothyroidism is measuring Thyroid Stimulating Hormone (TSH) levels.
- TSH Rationale: The pituitary gland secretes TSH to stimulate the thyroid gland. When thyroid hormones ($T_3$ and $T_4$) are low (hypothyroidism), the pituitary increases TSH secretion to compensate. This response makes TSH levels rise early and significantly, even before $T_3$ and $T_4$ levels become markedly abnormal. Therefore, an elevated TSH level is the earliest and most sensitive indicator of primary hypothyroidism.
- Other Tests:
- $T_3$, $T_4$ Levels: While decreased levels of free thyroxine ($FT_4$) and sometimes triiodothyronine ($T_3$) confirm hypothyroidism, they are less sensitive than TSH in detecting mild or early stages.
- TRH Levels: Thyrotropin-Releasing Hormone (TRH) tests are not routinely used for diagnosing hypothyroidism.
- Radioactive Iodine Uptake: This test assesses the thyroid gland's ability to take up iodine, often used in evaluating hyperthyroidism or goiters, not the primary sensitive test for hypothyroidism.
Measuring TSH is the standard, most sensitive first step in evaluating potential hypothyroidism.
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