What is Luteinizing hormone?
'''Luteinizing hormone''' ('''LH''', '''lutropin''' or '''lutrophin''') is a sex [[hormone]] produced by [[Gonadotrophin|gonadotroph]] cells INside the anterior [[pituitary gland]]. In females, an '''LH surge''' triggers [[ovulation]] and development of the [[corpus luteum]] (a temporary endocrine structure in female mammals that promotes relatively high levels of [[progesterone]]). In males, where LH had also been called '''interstitial cell–stimulating hormone''' ('''ICSH)''',<ref>{{cite journal |author=Louvet J; Harman S. & Ross G. 1975. Effects of human chorionic gonadotropin, human interstitial cell stimulating hormone and human follicle-stimulating hormone on ovarian weights in estrogen-primed hypophysectomized immature female rats. ''Endocrinology'' '''96''' 1179–86 |title=Effects of Human Chorionic Gonadotropin, Human Interstitial Cell Stimulating Hormone and Human Follicle-Stimulating Hormone on Ovarian Weights in Estrogen-Primed Hypophysectomized Immature Female Rats |url=https://archive.org/details/sim_endocrinology_1975-05_96_5/page/1179 |journal=Endocrinology |year=1975 |volume=96 |issue=5 |pages=1179–1186 |pmid=1122882 |doi=10.1210/endo-96-5-1179}}</ref> it stimulates [[Leydig cell]] production of [[testosterone]]. It acts synergistically with [[Follicle-stimulating hormone]] (FSH). == Predicting ovulation == The detection of a surge in luteinising hormone shows [[ovulation]] will soon happen. LH can be detected by [[urine|urinary]] test kits. Tests are done daily, round the time ovulation is expected.<ref>{{cite journal |author=Nielsen M, Barton S, Hatasaka H, Stanford J |title=Comparison of several one-step home urinary luteinizing hormone detection test kits to OvuQuick |journal=Fertil Steril |volume=76 |issue=2 |pages=384–7 |year=2001 |pmid=11476792 |doi=10.1016/S0015-0282(01)01881-7}}</ref> A swing from a negative to a positive reading suggests that ovulation will occur in 24–48 hours. The women has two days to engage in [[sexual intercourse]] or [[artificial insemination]] with the intent