A postnatal rise in TRH induces a(n) ______ in blood TSH levels and a(n) ______ in blood T₄ levels as the fetus transitions from the in-utero environment to the postnatal delivery-room environment.

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The thyroid hormone axis is one of several endocrine axes stimulated immediately after birth.The major hormones of this axis are thyrotropin (TRH), thyroid-stimulating hormone (TSH), and thyroxine (T₄).A postnatal rise in TRH induces an increase in blood TSH and T₄ levels as the fetus transitions from the in-utero environment to the postnatal delivery-room environment.Peak levels correlate with gestational age.Adult thyroid hormone levels are achieved by 4 weeks of age.

A Postnatal Rise in TRH Induces A(n) ______ in Blood