drg fsh, 96 wells
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- drg international inc.
- fsh, 96 wells
for the widest selection of hormone assays, there’s no place like block scientific. we are one of the well-known laboratory equipment dealers in bellport, new york. we offer the fsh, 96 wells at a competitive price and can deliver it to you promptly too. the drg fsh elisa is an enzyme immunoassay for the quantitative in vitro diagnostic measurement of follicle stimulating hormone (fsh) in serum.
follicle stimulating hormone assay
the drg fsh elisa kit is a solid phase enzyme-linked immunosorbent assay (elisa) based on the sandwich principle.
- provided reagents – standard (standard 0-5), microtiterwells, enzyme conjugate, stop solution, substrate solution
- when stored at 2 °c to 8 °c unopened reagents will retain reactivity until expiration date.
summary and explanation
follicle-stimulating hormone (fsh) and luteinizing hormone (lh) are intimately involved in the control of the growth and reproductive activities of the gonadal tissues, which synthesize and secrete male and female sex hormones through a negative feedback relationship (1,2).
fsh is a glycoprotein secreted by the basophil cells of the anterior pituitary. gonadotropin-releasing hormone (gnrh), produced in the hypothalamus, controls the release of fsh from the anterior pituitary. like other glycoproteins, such as lh, tsh, and hcg, fsh consists of subunits designated as alpha and beta. hormones of this type have alpha subunits that are very similar structurally, therefore the biological and immunological properties of each are dependent on the unique beta subunit (3,4,5).
in the female, fsh stimulates the growth and maturation of ovarian follicles by acting directly on the receptors located on the granulosa cells; follicular steroidogenesis is promoted and lh production is stimulated. the lh produced then binds to the theca cells and stimulates steroidogenesis. increased intraovarian estradiol production occurs as follicular maturation advances, thereupon stimulating increased fsh receptor activity and fsh follicular binding. fsh, lh, and estradiol are therefore intimately related in supporting ovarian recruitment and maturation in women (6,7,9). fsh levels are elevated after menopause, castration, and in premature ovarian failure. the levels of fsh may be normalized through the administration of estrogens, which demonstrate a negative feedback mechanism. abnormal relationships between fsh and lh, between fsh and estrogen have been linked to anorexia nervosa and polycystic ovarian disease. although there are significant exceptions ovarian failure is indicated when random fsh concentrations exceed 40 miu/ml (8).
the growth of the seminiferous tubules and maintenance of spermatogenesis in men are regulated by fsh. however, androgens, unlike estrogens, do not lower fsh levels, therefore demonstrating a feedback relationship only with serum lh (10,11,12). for reasons not fully understood, azospermic and oligospermic males usually have elevated fsh levels. tumors of the testes generally depress serum fsh concentrations, but levels of lh are elevated, as determined by radioimmunoassay. it has been postulated that the apparent lh increase may be caused by crossreactivity with hcg-like substances secreted by tumors of the testes (11,12). high levels of fsh in men may be found in primary testicular failure and klinefelter syndrome. elevated concentrations are also present in cases of starvation, renal failure, hyperthyroidism, and cirrhosis (1,3).