estrane

es·trane

(es'trān),
Hypothetic parent hydrocarbon of the (steroid) estrogenic compounds with names that begin with "estr-" (estradiol, estrone, estriol); conceived to establish a systematic nomenclature.
Farlex Partner Medical Dictionary © Farlex 2012
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* Breakthrough bleeding may be due to progestin type; switching from an estrane to a gonane may reduce it
(46) An OC with a gonane rather than an estrane progestin may be beneficial as this class of progestins may provide more consistent hormonal effects on the endometrium.
The 2 most common contraceptive progestins are derived from 19-nortestosterone, and are classified as gonanes or estranes. (23)
OCs, breakthrough bleeding, and patients' need to know: managing expectations is as important as adjusting formulations

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