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Doi:10.1016/s0015-0282(02)04757-x

FERTILITY AND STERILITY
VOL. 79, NO. 3, MARCH 2003Copyright 2003 American Society for Reproductive MedicinePublished by Elsevier Science Inc.
Printed on acid-free paper in U.S.A.
Luteal estradiol administration strengthens
the relationship between day 3 follicle-
stimulating hormone and inhibin B levels
and ovarian follicular status

Renato Fanchin, M.D.,a Joa˜o Sabino Cunha-Filho, M.D.,a Luca Maria Schona¨uer, M.D.,aClaudia Righini, M.D.,a Dominique de Ziegler, M.D.,b and Rene´ Frydman, M.D.a Department of Obstetrics and Gynecology and Reproductive Medicine, Hoˆpital Antoine Be´cle`re, Clamart,France Objective: To investigate whether the prevention of early follicular growth by luteal E administration
improves the relationship between day 3 hormone measurements and the ovarian follicular status.
Design: Prospective, cohort study.
Setting: Assisted reproductive technology unit in Clamart, France.
Patient(s): One hundred sixty-two infertile women.
Intervention(s): Participants received oral 17␤-E , 4 mg/day, from day 20 to the next cycle day 1 (n ϭ 81)
or served as controls (n ϭ 81). Serum E , inhibin B, and FSH were measured during the 3 days after E discontinuation (FD1, FD2, and FD3) in E -treated women and on cycle day 3 (CD3) in controls. Early antral follicles were counted at ultrasound scans on FD3 and CD3.
Main Outcome Measure(s): Hormonal-follicular correlations on FD3 and CD3.
Result(s): As expected, after E withdrawal, inhibin B and FSH increased from FD1 to FD3 whereas E
decreased. Correlations between FSH and inhibin B and follicular counts were stronger on FD3 than on CD3.
Conclusion(s): Luteal E administration notably strengthens the relationship between serum FSH and inhibin
B levels and the number of antral follicles on day 3. This approach may represent an alternative test of ovarian
follicular status. (Fertil Steril௡ 2003;79:585–9. 2003 by American Society for Reproductive Medicine.)
Key Words: FSH, estradiol, ovarian reserve, controlled ovarian hyperstimulation
During the luteal-follicular transition, in- During the ultimate phase of the menstrual cycle, there is a progressive increase in FSH early antral follicles modulate their own stim- levels that parallels the corpus luteum demise ulation by FSH. Given that reproductive aging and starts up to 5 days before the onset of is characterized by the quantitative depletion of premenstrual exposure of early antral follicles consequent reduction in peripheral inhibin B to FSH may accelerate their development dur- and E concentrations amplifies intercycle FSH ing the first days of the follicular phase secretion, which culminates 2 to 3 days after Because larger follicles are likely to produce sible that such a phenomenon interferes with FSH secretion, thereby altering the predictabil- widely used as markers of ovarian status and ity of peripheral day 3 FSH and inhibin B responsiveness to controlled ovarian hyper- measurements on the ovarian follicular status.
dence indicates that these hormone measure- Based on this contention, it is conceivable ments, arbitrarily timed to the onset of menses, that the suppression of FSH secretion during offer only a pale reflection of women’s fecun- the late luteal phase could avoid premature development of early antral follicles and im- prove the reliability of hormonal measurements. Indeed, the previously described For inhibin B, the lower limit of administration of physiological E doses during the luteal- detection was 10 pg/mL, and the intraassay and interassay follicular transition has been shown to effectively prevent CV were Ͻ6% and Ͻ9%, respectively. Serum E was de- intercycle FSH rise and, consequently, untimely follicular termined by an automated multianalysis system using a growth In addition, after E discontinuation, FSH chemiluminescence technique (ACS-180, Bayer Diagnos- levels increase rapidly and peak 3 days later Hence, tics, Puteaux, France). For E , the lower limit of detection we hypothesized that the control of early antral follicular was 15 pg/mL, and intraassay and interassay CV were 8% development by exogenous E would be instrumental in and 9%, respectively. The specificity of the FSH, inhibin B, strengthening correlations between FSH and inhibin B levels and E assays was 100%, 99.5%, and 100%, respectively.
measured on day 3 and the ovarian follicular status.
Ultrasound Monitoring
Both on FD3 and on CD3, ultrasounds scans of the MATERIALS AND METHODS
ovaries were performed with a 4.5–7.2 MHz multifrequencytransvaginal probe (Siemens Elegra, Siemens S.A.S., Saint- Patients
Denis, France) by one single operator (C.R.) at approxi- We prospectively studied 162 infertile women, 27 to 44 mately 9:00 AM. The objective of these examinations was to years of age who met the following inclusion criteria: 1) count the total number of early antral follicles (2 to 8 mm in regular, ovulatory menstrual cycles every 25 to 35 days; 2) diameter) in both ovaries. The operator was unaware of both both ovaries present; 3) no current or past diseases affecting treatment schedule and hormonal results. In an attempt to ovaries or gonadotropin or sex steroid secretion, clearance, optimize recognition of ovarian follicles, the ultrasound or excretion; 4) body mass indexes ranging from 18 to 25 scanner used was equipped with a tissue harmonic imaging kg/m2; 5) no current hormone therapy; and 6) adequate system Tissue harmonic imaging is based on ultrasound visualization of ovaries in transvaginal ultrasound scans.
signal frequency changes during propagation through the Infertility was unexplained (69%), or due to sperm (21%) or target media. This change is called a harmonic and is essen- mild tubal (9%) abnormalities. An informed consent was tially a doubling of the original frequency. Hence, the re- obtained from all women and this investigation received the turning high frequency signal has to only travel one direction approval of our internal institutional review board.
(return to the probe), which enhances signal penetration, Study Protocol
reduces near field noise and image haze, and provides in- Participants either received luteal E treatment or served as controls. Women included in the E -treated group (n ϭ Statistics
81) were given oral micronized 17␤-E (4 mg/day; Pro- The measure of central tendency used for continuous vame`s, Cassenne Laboratories, Puteaux, France) in the variables was the mean and the measure of variability was evening at 8:00 PM, from day 20 until day 1 of the next cycle.
the standard error of the mean. Longitudinal hormonal To document the hormonal profile following E discontinu- changes were assessed by analysis of variance with repeated ation, serum FSH, inhibin B, and E levels were measured on measures or paired Student’s t-test when appropriate. Rela- the 3 subsequent days referred to as functional days (FD): tionship between two different continuous variables were FD1, FD2, and FD3, respectively. On FD3, early antral assessed by correlation. The Fisher r to z test was used to follicles were counted at ultrasound scans. Women included determine if correlation coefficients (r) were different from in the control group (n ϭ 81) did not receive any treatment zero. Comparison of strength of correlations was performed during the luteal phase and had similar hormonal and ultra- using the Hotelling’s t-test which assesses the differ- sonographic measurements on the third day of the subse- ence between coefficients of correlation for correlated sam- quent cycle, referred to as cycle day (CD) 3. Women in both ples. PϽ.05 was considered statistically significant.
groups were asked to compute the length of the menstrualcycle studied.
Hormonal Measurements
All blood samples were obtained by venipuncture, per- Overall Data
formed at approximately 8:00 AM, and serum was separated As expected by design, E -treated and control groups and frozen in aliquots at Ϫ20°C for subsequent centralized were strictly comparable in regard to mean women’s ages analysis. Serum FSH levels were determined by an auto- (33.9 Ϯ 0.4 vs. 33.6 Ϯ 0.5 years, respectively), frequency mated multianalysis system using a chemiluminescence distributions of causes of infertility (unexplained, 68% and technique (ACS-180, Bayer Diagnostics, Puteaux, France).
70%; sperm abnormalities, 22% and 21%; mild tubal alter- Intraassay and interassay coefficients of variation (CV) were, ation, 9% and 9%, respectively), and early antral follicular respectively, 3% and 5%, and the lower limit of detection counts (10.1 Ϯ 0.7 follicles on FD3 and 10.6 Ϯ 0.6 follicles was 0.1 mIU/mL for FSH. Serum inhibin B was determined on CD3). In addition, the number of early antral follicles and by double antibody ELISA (Serotec, Varilhes, France) as women’s ages showed similar negative correlations in E - Fanchin et al.
treated as in control groups (r ϭ Ϫ0.41, PϽ.0001 and r ϭ Ϫ0.39, PϽ.0001, respectively). The mean length of the preceding cycle was not altered by luteal E administration Serum FSH (top panel), inhibin B (middle panel), and E and remained similar in both groups (28.1 Ϯ 0.2 versus (bottom panel) profiles during the first 3 days after E discon- 28.2 Ϯ 0.2 days, respectively). However, the subsequent tinuation (FD1, FD2, and FD3) in the E -treated group. Both menstrual cycles lasted slightly, but significantly, longer in the progressive elevation in FSH and inhibin B levels, as wellas the decrease in E levels, from FD1 to FD3 were statisti- the E -treated women (29.1 Ϯ 0.2 days) than in the controls cally significant (open bars, PϽ.0001). Hormone levels on FD3 were significantly different as compared to controls(CD3, closed bars, *PϽ.0001).
The hormonal dynamics after exogenous E discontinua- tion in the E -treated group as well as the comparison of hormone levels between FD3 and CD3 are depicted in Serum FSH levels were low at 3.8 Ϯ 0.2 mIU/mL onthe first day of E withdrawal (FD1) and increased progres- sively on FD2 (7.2 Ϯ 0.4 mIU/mL) and FD3 (10.5 Ϯ 0.6mIU/mL) (PϽ.0001). It is noticeable that FSH levels weresignificantly higher on FD3 than on CD3 (8.3 Ϯ 0.4 mIU/mL, PϽ.0006). Similarly to FSH, serum inhibin B levelswere low on FD1 (18.6 Ϯ 1.1 pg/mL) and increased pro-gressively from FD2 to FD3 (33.2 Ϯ 2.9 and 71.2 Ϯ 5.6pg/mL, respectively) (PϽ.0001). Yet serum inhibin B levelson FD3 were lower than inhibin B levels on CD3 (90.0 Ϯ 3.6pg/mL, PϽ.006). Further, E administration maintained se- rum E at levels comparable to those observed during the late follicular phase of the menstrual cycle as measured on FD1(152.7 Ϯ 5.9 pg/mL). After oral treatment was discontinued,serum E levels decreased progressively (73.6 Ϯ 4.2 and 52.2 Ϯ 3.2 pg/mL, on FD2 and FD3, respectively)(PϽ.0001). Serum E levels were higher on FD3 than on CD3 (34.3 Ϯ 2.3 pg/mL, PϽ.0001), presumably as a resultof exogenous and endogenous contributions.
Follicular and Hormonal Relationships
The strength of the correlations between serum hormone levels on FD3 (E -treated group) and on CD3 (control group) and early antral follicular counts are summarized in Table 1.
Serum FSH levels showed a stronger negative correlationwith the number of early antral follicles on FD3 (r ϭ Ϫ0.44,PϽ.0001) than on CD3 (r ϭ Ϫ0.23, PϽ0.04). Comparisonof strength of correlations indicated that this difference wasstatistically significant (PϽ.02). Similarly, the correlationbetween serum inhibin B levels and early antral follicularcounts was stronger (PϽ.001) on FD3 (r ϭ 0.59, PϽ.0001)than on CD3 (r ϭ 0.24, P Ͻ.03). In contrast, serum E levels failed to correlate with early antral follicular counts on eitherFD3 or CD3. Furthermore, serum FSH and inhibin B were Fanchin. FSH and inhibin B elevation timed by E . Fertil Steril 2003. correlated to each other only in patients who were pretreatedwith E (r ϭ Ϫ0.30, PϽ.0007 vs. r ϭ Ϫ0.07, PϾ.05). This measurements performed on cycle day 3. The objective of E2 difference was statistically significant (PϽ.02).
administration was to control the timing of FSH elevationduring the luteal-follicular transition to prevent premature DISCUSSION
follicular development and, therefore, optimize hormonal- The results of the present investigation indicate that the magnitude of FSH and inhibin B elevation timed by luteal E Indeed, previous data have demonstrated that, during the administration is better correlated to the ovarian follicular late luteal phase of the menstrual cycle, spontaneous demise status than conventional, uncontrolled FSH and inhibin B of the corpus luteum leads to a progressive FSH rise that FERTILITY & STERILITY
starts approximately 5 days before menses and reach that observed after profound FSH suppression by GnRH serum levels Ͼ7 mIU/mL 3 days before the onset of men- agonist administration and subsequent FSH treatment as strual bleeding On account of the enhanced sensitivity of reported previously This strengthens the hypothesis early antral follicles to FSH during the late luteal phase that similar follicular status may be obtained after FSH it is presumable that luteal FSH secretion hastens the suppression by exogenous E as compared to pituitary de- pace of follicular development In addition, this phe- nomenon has been reported as being more striking in women In addition, it is noteworthy that serum inhibin B levels who display some degree of follicular exhaustion and de- were lower on FD3 as compared to CD3. Given that inhibin clined fecundity Our data confirmed that administration secretion also depends on follicular sizes it is of physiological E doses during the late luteal phase effec- possible that early antral follicles were smaller in E -treated tively maintained FSH secretion at low levels (3.8 Ϯ 0.2 patients as compared with controls. In line with this, men- mIU/mL on FD1), which is in keeping with results reported strual cycles lasted longer in women who were pretreated with E , possibly due to a longer growth course of smaller As expected, a dramatic FSH elevation occurred during antral follicles to ovulation. An analogous phenomenon has the 3 subsequent days after E withdrawal. Interestingly, been observed in E -treated monkeys Unfortunately, serum FSH levels were significantly higher on FD3 than on the design of the present study did not include antral follic- CD3. Some elements led us to infer that these differences ular size measurements, which prevents us from making any were neither phenomenological nor due to patient heteroge- conclusion on this point. This issue is currently being inves- neities. Indeed, our experimental design required population selection, randomization, and blinded measurements; also, Furthermore, no evidence of increasing E production as clinical and ultrasonographic attributes of patients were re- a result of endogenous FSH stimulus was observed in the markably similar in both groups. Taken together, these meth- E -treated group. In response to FSH, E secretion by the odological characteristics minimized as far as possible the early antral follicles is scarce and variable, probably due to likelihood that individual discrepancies accounted for the the incipient aromatase activity in early antral follicles observed hormonal differences. Moreover, these results cor- In agreement, serum E levels correlated with the roborate previous experiments conducted in rhesus monkeys, number of early antral follicles on neither FD3 nor CD3, in which removal of E administration during the follicular which challenges the reliability of day 3 E measurements phase led to larger FSH release as compared to untreated for prognosticating antral follicular reserve. Yet endogenous E secretion by antral follicles participates in the regulation Hence, it is conceivable that FSH level differences be- of FSH levels. Hence, the lack of mutual FSH and inhibin B tween FD3 and CD3 result from luteal E administration correlation in the untreated group is consistent with the through a number of mechanisms. First, the overall reduced varying E production by antral follicles displaying hetero- inhibin B and E secretion by small early antral follicles is likely to insufficiently suppress FSH secretion. Indeed, our The central observation of the present study was the more results indicated that inhibin B levels were very low on the strict correlation between the magnitude of FSH and inhibin day after E withdrawal (FD1) and reached lower levels on B rise timed by E administration and the number of early FD3 than on CD3. Second, whereas FD3 corresponded pre- antral follicles as compared to controls. This indicates that cisely to the third day of FSH elevation in E -treated pa- the control of follicular exposure to FSH by E administra- tients, the timing of FSH elevation could not be directed in tion may refine the analysis of hormonal-follicular relation- controls. Hence, on CD3, serum FSH levels may have been ships, commonly timed to the onset of menses, and improve influenced by the stage of follicular growth in untreated their clinical usefulness. Indeed, it is conceivable that the women. Finally, the putative negative feedback effect of putative prognostic value of early antral follicular counts prolonged E treatment on GnRH pulse characteristics on women’s fertility and responsiveness to controlled and/or on pituitary gonadotropin secretion could have ovarian hyperstimulation may be further improved by con- elicited a select favoritism of FSH beta expression in E - treated patients. However, this issue deserves further clari- In conclusion, the intercycle FSH and inhibin B rise timed by E administration represents an interesting, alternative Serum E and inhibin B profiles from FD1 to FD3 in strategy to assess ovarian follicular status. The observed E -treated group markedly differed from each other.
improvement of hormonal-follicular correlations may be ex- Whereas inhibin B levels dramatically increased in response plained by a possible modification of early follicular growth to FSH stimulation, E levels fell progressively from FD1 to and steroidogenesis due to decreased premenstrual FSH se- FD3 as a result of the interrupted exogenous contribution.
cretion. Additional investigation is needed to assess possible Incidentally, the pace of inhibin B increase after E with- consequences of luteal E administration on the early antral drawal observed in the present study is remarkably similar to follicle characteristics during the early follicular phase. More Fanchin et al.
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FERTILITY & STERILITY

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