The partition coefficient of the ester in question is important because is effects how long the drug itself stays in the system. If the testosterone transfers too quickly from the oil to the blood, the result is a sudden spike in testosterone which then rapidly drops once the dose has been used up. In the example of free testosterone injected into the muscle from a water suspension (as in Aquiviron, mentioned above), the testosterone is essentially immediately available to the bloodstream due to its low partition coefficient, and thus there is an immediate spike of testosterone which is used up quickly in the body.
Aetna covers ovarian stimulation medications and techniques only for women who have a biologic capacity to effectively respond to ovarian stimulation. Serum FSH is a marker of ovarian responsiveness. Ovarian responsiveness is determined by measurement of an unmedicated day 3 FSH obtained within the prior 6 months if the woman is older than age 35 or in the prior 12 months if the individual is age 35 or younger. In women greater than age 40, any single FSH greater than 19mIU/mL, regardless of subsequent test results that may be lower than 19mIU/mL, are indicative of ovarian insufficiency. In women less than age 40, ovarian responsiveness is demonstrated by any unmedicated day 3 FSH of less than 19mIU/ml. Younger women with a day 3 FSH less than 19mIU/ml have the capacity to respond to ovarian stimulation, even if they have had other day 3 FSH measurements greater than 19 mIU/mL.