SimThyr is a simulation program for thyroid homeostasis. It is based on a published nonlinear parametric isomorphic model of thyrotropic feedback control. Applications of SimThyr cover generation of hypotheses for biomedical research, education and presentation. Binaries and sourcecode are available for Mac OS, Mac OS X, Windows, Linux and other Unix derivatives.
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SPINA (structure parameter inference approach) is a method for calculating constant structure parameters of endocrine feedback control systems in vivo from hormone levels obtained from serum or plasma.
A first successful implementation applies to evaluation of thyroid function. It allows for calculating the thyroid's maximum secretory capacity (GT or SPINA-GT) and the sum activity of peripheral 5'-deiodinases (GD or SPINA-GD) from levels of TSH, (F)T4 and (F)T3 that have been determined once only (SPINA Thyr).