Living Well With Hypothyroidism – Part 2

February 5th, 2011 by admin

Examination of thyroid gland with isotopes is accomplished at any time possible previous to initiating therapy but if required can be completed following a few days of treatment. For this purpose it is used technetium-99m (99mTc) owing to its ready availability. This technique called isotope scan typically provides precise diagnostic data and permits the family to be given an elucidation of the characteristics of their child’s disease, mainly if a thyroid gland is observed in an abnormal place (ectopic) or there is missing or deficient isotope uptake in the neck as a result of absence or malformation of the thyroid gland.

These conclusions specify a broad diagnosis of thyroid gland malformation (thyroid dysgenesis), which has a small danger of reappearance but is of as yet unidentified origin. Demonstration of normally located thyroid tissue, an isotope scan with 99mTc also permits, the recognition of a hereditary deficiency of thyroxine (T4) production that usually carries a menace of return.

In those individuals with a normally placed thyroid gland, specialized laboratory techniques are well established to recognize the kind of biosynthetic deficiency. In very rare occasions the 99mTc search provides a confusing result. It has been shown a small amount of cases who have had no isotope uptake in the neck but who were then revealed to have regular thyroid activity at the moment of the examination. While the origin is not obvious, the manifestation of absence of thyroid gland by means of 99mTc should be considered with some doubt awaiting the confirmation of diagnosis by the results for levels of TSH and T4 in plasma.

Ultrasound scan of the thyroid gland have restricted utility in little infants with congenital hypothyroidism, mainly due to complexity in recognizing thyroid tissue in an abnormal place.

Other radiographic tests like manifestation of missing epiphyses at the knee were previously the most ordinary test for congenital hypothyroidism. Some doctors continue this practice for several years as they consider that the level of bone age delay might be of predictive significance regarding the result for intellect. Investigation of the intelligence quotient (IQ) score at 5 years in some patients showed, however, that this test did not calculate outcome as surely as pretreatment plasma thyroid hormones amounts. Subsequent to beginning of treatment, serial radiography of the wrist and hand for evaluation of bone age is of small importance and many doctors do not carry this out on a regular basis.

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