Ntchito yaikulu ya chithokomiro ndi kupanga ndi kutulutsa mahomoni a chithokomiro, kuphatikizapo thyroxine (T4) ndi triiodothyronine (T3), Free Thyroxine (FT4), Fre Triiodothyronine (FT3) ndi Thyroid Stimulating Hormone zomwe zimagwira ntchito yofunika kwambiri pa kagayidwe ka thupi ndi kugwiritsa ntchito mphamvu.

Mahomoni a chithokomiro amakhudza kukula kwa thupi la munthu, kukula, kagayidwe kachakudya, ndi thanzi lake lonse mwa kulamulira njira za thupi monga kuchuluka kwa kagayidwe kachakudya m'maselo, kutentha kwa thupi, kugunda kwa mtima, mphamvu ya kugaya chakudya, ntchito ya mitsempha ndi minofu, kupanga maselo ofiira a magazi, ndi kagayidwe ka mafupa.

Chithokomiro chogwira ntchito mopitirira muyeso kapena chosagwira bwino ntchito chingayambitse kusagwirizana kwa thupi ndi mahomoni amenewa. Hyperthyroidism ingayambitse kagayidwe kachakudya mofulumira, kuchuluka kwa kugunda kwa mtima, kutentha kwa thupi, komanso kugwiritsa ntchito mafuta mwachangu, pomwe hypothyroidism ingayambitse kuchepa kwa kagayidwe kachakudya, kuchepa kwa kugunda kwa mtima, kuchepa kwa kutentha kwa thupi, komanso kuchepa kwa kutentha kwa thupi.

Apa tili ndiMayeso a TT3t,Mayeso a TT4, Mayeso a FT4, Mayeso a FT3,Kiti yoyesera ya TSHkuti azindikire ntchito ya chithokomiro