Fasting plasma gastrin levels measured by radioimmunoassay were found to be elevated in patients with hyperthyroidism. The intravenous injection of arginine caused an increase of plasma gastrin in hyperthyroid patients as in normal subjects. The elevated gastrin level in patients with hyperthyroidism was significantly lowered after the thyroid function was normalized by treatment.
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Seino et al. (1976) studied this question.
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