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Blood work performed at Nike’s lab showed that Ritzenhein’s thyroid-stimulating hormone and his testosterone levels were both within the normal range.

A TSH test measures thyroid-stimulating hormone, or TSH, a signal from the pituitary gland that the body needs more thyroid hormone.

Wagonhurst’s pediatrician, Dr. James E. Fragetta, said the teenager’s thyroid-stimulating hormone was elevated at times when her melanoma seemed to present and spread.

Thyroid hormone works by: The pituitary gland in the brain produces thyroid-stimulating hormone, or TSH.

When these cells were grown in Petri dishes in the presence of thyroid-stimulating hormone, they turned into thyroid cells.