Выражение встречается в следующем контексте: Various strat-
egies have been used to improve ovarian response, including the
use of higher doses of human menopausal gonadotrophins
(hMG) or recombinant follicle-stimulating hormone, use of adjuvant growth hormone or growth hormone releasing factor, flare-up protocols, administration of
gonadotrophin-releasing hormone (GnRH) agonists.
Статья посвящена ЭКО

Заранее спасибо!

http://www.gameta.pl/ru/dla-pacnenta/metody-lieczenia/stymulacja-owulacji.html

"Flare" protocols, also sometimes called "short" protocols
http://www.advancedfertility.com/ivfstim.htm