Subclinical Hyperthyroidism: This condition is characterized by a low TSH level with normal thyroid hormone levels (T4 and T3). The provided TSH level of 0.367 is below the normal range, suggesting hyperthyroidism, while the T4 level of 1.36 is within the normal range, indicating that the condition is subclinical.

Early Stages of Hyperthyroidism: The patient might be in the early stages of hyperthyroidism, where TSH is suppressed but T4 and T3 levels have not yet risen above the normal range.
Thyroid Hormone Resistance: A rare condition where the body's tissues are resistant to thyroid hormones, leading to elevated T4 and T3 levels but a normal or low TSH level due to feedback mechanisms.
Pituitary or Hypothalamic Disease: Certain diseases affecting the pituitary gland or hypothalamus can lead to abnormal TSH secretion, resulting in low TSH levels despite normal or low thyroid hormone levels.

Thyroid Storm: Although less likely given the normal T4 level, thyroid storm is a life-threatening condition that requires immediate attention. It can present with low TSH and variable thyroid hormone levels.
Pituitary Apoplexy: A medical emergency where the pituitary gland suddenly hemorrhages or becomes infarcted, potentially leading to acute hypopituitarism, which might initially present with low TSH levels.
Metastatic Disease to the Pituitary: Certain cancers can metastasize to the pituitary gland, affecting hormone secretion, including TSH.

TSH-Producing Pituitary Adenoma: A rare type of pituitary tumor that secretes TSH, leading to hyperthyroidism. However, the low TSH level in this case makes this diagnosis less likely.
Familial Dysalbuminemic Hyperthyroxinemia: A rare genetic condition characterized by abnormal binding of T4 to albumin, leading to elevated T4 levels but normal T3 and TSH levels.
Other Genetic Disorders: Various genetic disorders can affect thyroid function tests, though they are rare and often present with additional clinical features.