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SYSTEMATIC REVIEW article

Front. Endocrinol., 13 October 2021
Sec. Reproduction
This article is part of the Research Topic Clinical Applications of Anti-Mullerian Hormone and its Measurement in Reproductive Medicine and Women's Health View all 12 articles

The Value of Anti-Müllerian Hormone in the Prediction of Spontaneous Pregnancy: A Systematic Review and Meta-Analysis

Chenxi Lin&#x;Chenxi Lin1†Miaomiao Jing&#x;Miaomiao Jing1†Wenjun ZhuWenjun Zhu2Xiaoyu TuXiaoyu Tu1Qi Chen,Qi Chen1,3Xiufang Wang,Xiufang Wang1,4Youbing Zheng,Youbing Zheng1,5Runju Zhang*Runju Zhang1*
  • 1Key Laboratory of Reproductive Genetics (Ministry of Education), Department of Reproductive Endocrinology, Women’s Hospital, Zhejiang University School of Medicine, Hangzhou, China
  • 2Medical Quality Management Section, Women’s Hospital, Zhejiang University School of Medicine, Hangzhou, China
  • 3Department of Gynaecology and Obstetrics, Hangzhou Fuyang Women and Children Hospital, Hangzhou, China
  • 4Department of Gynaecology, Zhejiang Xiaoshan Hospital, Hangzhou, China
  • 5Department of Gynaecology, Shengzhou Maternal and Child Health Hospital, Shaoxing, China

Objective: To determine whether serum anti-Müllerian hormone (AMH) level is a predictor of clinical pregnancy in women trying to achieve a natural conception.

Methods: The PubMed, Embase, and Cochrane Library databases were searched for articles published until August 2020. Studies that met the inclusion and exclusion criteria were included in the meta-analysis; no language limitations were imposed. Quality was appraised using the Quality Assessment of Diagnostic Accuracy Studies-2 checklist. Heterogeneity due to the threshold effect was identified; thus, we plotted a summary receiver operating characteristic curve and calculated its area under the summary receiver operating characteristic curve (AUC) and Cochran’s Q index to assess whether AMH level is a predictor of spontaneous pregnancy. Publication bias and sensitivity were also assessed.

Results: Eleven studies (4,388 women) were ultimately included in this meta-analysis. The AUC and Cochran’s Q indices were 0.5932 and 0.5702, respectively. For women younger than 35 years, the AUC was 0.6355 and the Q index was 0.6025. For those older than 35 years, the AUC was 0.5536 and the Q index was 0.5403. Subgroup analyses by study type and population characteristics showed results similar to the overall outcome. No publication bias was identified, and the sensitivity analysis confirmed the robustness of the final result.

Conclusions: Serum AMH levels have poor predictive value for natural pregnancy. The predictive value of AMH was poor in the younger and older subgroups. Our findings suggest that low serum AMH levels are not associated with reduced fertility.

Introduction: This study investigated the predictive value of anti-Müllerian hormone (AMH) level for natural pregnancy. Other than age, few factors can predict the chances of natural fertility. AMH is an established biomarker of ovarian reserve that is widely used to predict oocyte yield in cases of in vitro fertilization (IVF) and menopause. In clinical practice, the applications of AMH are increasing. However, its predictive value for natural conception remains controversial. In this study, since AMH is closely related with ovarian reserve, we evaluated whether it has predictive value for natural pregnancy. Our findings will fine-tune the clinical application of AMH in pre-pregnancy counseling. The topic should be of wide interest to investigators in the reproductive endocrinology and gynecology fields.

Systematic Review Registration: PROSPERO 2020 CRD42020216265, Available from: https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42020216265.

Introduction

Female fecundability declines with increasing age due to decreasing oocyte quality and quantity, also known as diminished ovarian reserve (DOR). Age is an independent predictor of ovarian reserve, and females in the late reproductive period usually have a lower chance of spontaneous pregnancy and worse pregnancy outcomes (1). Approximately 10% of women develop a latent ovarian function decline at a younger age, leading to undesirable reproductive outcomes. In such cases, DOR is not clearly identified, and the clinical manifestation shows a regular menstrual cycle but a lower response to ovarian stimulation than that of their peers. Moreover, an ancillary examination shows abnormal ovarian reserve test results. DOR treatment mainly focuses on oocyte quality, oocyte quantity, and fertility (2).

There are several biomarkers of ovarian reserve, such as anti-Müllerian hormone (AMH), follicle-stimulating hormone (FSH), and inhibit-B (3). AMH, a member of the transforming growth factor-β family that is secreted by the granulosa cells of preantral and antral follicles, reflects the follicle reserve and is considered one of the most established biomarkers of ovarian reserve. Compared to other biomarkers, AMH levels are more stable during the menstrual cycle (4). When ovarian reserve starts to decline, serum AMH level changes occur earlier than basal FSH level increases, and menstrual disorders develop. Thus, AMH level is thought to reflect decreased ovarian function early. In clinical practice, AMH level is widely used to predict menopause and reflect ovarian response in cases of assisted reproductive technology (ART) (57). However, existing studies have shown inconsistent viewpoints regarding its application in the prediction of natural conception. Several researchers have indicated that clinical doctors should consider AMH levels during fertility counseling, as low AMH levels appear to be a risk factor for a reduced natural pregnancy rate (813). However, other studies have reported the opposite result (1421).

Although numerous case-control and cohort studies have been published to date, high-quality prospective cohort studies stratified by age that fully explore the predictive value of AMH in natural pregnancy are lacking.

Since previous studies presented inconsistent conclusions about AMH for predicting natural clinical pregnancy, this systematic review and meta-analysis aimed to identify whether serum AMH levels can predict natural clinical pregnancy in age-stratified women.

Materials and Methods

Search Strategy

This study was performed in accordance with PRISMA guidelines (22). This meta-analysis was registered in PROSPERO (ID: CRD42020216265). The PubMed, Embase, and Cochrane Library databases were searched for articles published until August 2020. The following keywords and subject terms were used: (Pregnancy OR Pregnancies OR Gestation OR Reproductive outcome OR Fertility OR Fecundability OR Conception) AND (AMH OR Anti-Muellerian Hormone OR Mullerian-Inhibiting Hormone OR Mullerian Regression Factor OR Mullerian Inhibiting Hormone OR Mullerian-Inhibitory Substance OR Anti-Mullerian Factor OR Mullerian-Inhibiting Factor OR Anti-Mullerian Hormone). The reference list of each identified primary study was also manually searched to ensure that all eligible studies were included in this meta-analysis. No language-related limitations were imposed.

Eligibility Criteria and Exclusion Criteria

The inclusion criteria were as follows: (i) the study population included women of reproductive age and trying to get pregnant naturally for which the outcomes of clinical pregnancy within a year were recorded; (ii) serum AMH level was measured and study identify a low AMH cutoff value; (iii) women were recruited from the hospital or community; and (iv) sufficient information was available to construct the 2×2 contingency table—the true-positive, true-negative, false-positive, and false-negative test results at certain cutoff values. Considering that infertility is identified as the failure to achieve a successful pregnancy after 12 months or more of regular unprotected intercourse, studies comparing AMH levels of infertile and fertile women were included as well. If multiple publications reported the same or overlapping data, the most recent study with the largest population was included. If the same population was included in different studies with different selected AMH cutoff values, both studies were included in the meta-analysis. Studies were excluded if populations were restricted to women with diagnosed fallopian tube obstructive infertility, polycystic ovarian syndrome, or autoimmune disease. Reviews, conference abstracts, case reports, and comments were excluded from the study. Studies with insufficient or unavailable data were excluded from the analysis as well.

Study Selection and Data Extraction

Two investigators (CL and MJ) independently screened all titles and abstracts. The full text of the preselected studies was read separately by the same two investigators to identify which met the inclusion criteria. Discrepancies were resolved by discussion with a third investigator (RZ).

The original data were collected separately by the two reviewers to avoid extraction errors. The characteristics of each study were extracted as follows: first author, year of publication, study type, population characteristics, patient ages, suggested AMH threshold (converted to ng/ml using the conversion formula ng/ml = 7.14 pmol/L), AMH assay, and number of true- and false-positive and -negative results. True-positive results were identified as failing to achieve natural pregnancy in a year with a low AMH serum level.

Risk of Bias Assessment

The quality of the selected studies was assessed using RevMan 5.3 according to the QUADAS-2 checklist (23). The risk of bias of each study was divided into low, high, or unclear in terms of patient selection, index test, reference test, and flow and timing.

Data Synthesis

The meta-analysis was performed using Meta-DiSc 1.4 software and STATA 12.0 software. The threshold effect, one of the most important causes of heterogeneity in diagnostic tests, was explored in Meta-DiSc 1.4 (24). The correlation between sensitivity and specificity was calculated to identify the threshold effect (25). A negative correlation (or positive correlation between sensitivities and 1-specificities), which results in a typical pattern of a “shoulder arm” plot in a summary receiver operating curve (SROC) space, suggests that different thresholds or cutoffs used in different studies cause the primary heterogeneity. If the threshold effect was present, the SROC curve was plotted, and its area under the curve (AUC) was calculated with the Cochran’s Q index. If no threshold effect is present, diagnostic odds ratio, sensitivity, specificity, and positive and negative likelihood ratios of AMH for predicting pregnancy were also generated. The Chi-square test was further used to explore heterogeneity other than the threshold effect, and the I-squared measure was used to quantify heterogeneity. The test level for the meta-analysis was set at α=0.05. Heterogeneity analyses were performed according to study type and population characteristics (e.g., risk factors for infertility). Deeks’ funnel and sensitivity analyses were also performed using STATA 12.0 software to analyze potential publication bias and the robustness of the results.

Results

Study Selection

A flowchart of the study selection process is shown in Figure 1. We searched the PubMed, Cochrane Library, and Embase databases and retrieved 4,730 pieces of literature. A total of 3,942 records remained after the removal of duplicates. After careful screening of the titles and abstracts, 110 studies remained and were subjected to the full-text review. In this process, 55 were excluded for the lack of relevance, not meeting the inclusion criteria, or meeting the exclusion criteria; 32 were excluded for article type (25 conference summaries, four reviews, and three clinical study registrations). Of the remaining studies, three did not include sufficient data to make a 2×2 contingency table, seven had unavailable full text, and two included a duplicate population. Finally, 11 studies were included in this meta-analysis (8, 11, 1416, 2631).

FIGURE 1
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Figure 1 Flow of studies through the review.

Study Characteristics

The characteristics, inclusion criteria, and exclusion criteria of the 11 studies are listed in Tables 1 and 2. Of them, seven were prospective (8, 11, 1416, 27, 31), two were case-control studies (15, 30), one was a retrospective cohort study (26), and one was a cross-sectional cohort study (28). Four other studies further included women over the age of 35 years (16, 28, 30, 31), while two focused on only women of younger reproductive age (≤35 years) (11, 14). Among the eligible studies, three included participants with one or more risk factors that may affect natural conception, such as ovarian surgery, endometriosis, or a history of infertility, while five studies did not and three studies compared the serum AMH levels in infertile women or those who achieved a pregnancy after more than 12 months of trying, to those with normal fertility.

TABLE 1
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Table 1 Characteristics of the studies included in the meta-analysis.

TABLE 2
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Table 2 Characteristics of the studies included in the meta-analysis.

Synthesis of Results

Test heterogeneity presented a threshold effect in these 11 studies (n=4,388, Spearman correlation coefficient=0.902, p<0.01). Thus, we plotted an SROC curve and calculated its AUC and Q index, which were 0.5932 and 0.5702, respectively (Figure 2A). We further stratified this analysis into age subgroups. Six studies (n=2,908) were included in the young group, with an AUC of 0.6355 and a Q index of 0.6025 (Figure 2B). Four studies (n=863) were included in the elderly group, with an AUC of 0.5536 and Q index of 0.5403 (Figure 2C). When the studies were categorized by type, seven (n=2,539) were included in the prospective group, while four studies were included in another group (retrospective cohort, case-control, and cross-sectional studies; n=1,849). The AUC was 0.6186 vs. 0.5707, while the Q index was 0.5895 vs. 0.5531, respectively (Figures 3A, B). Among the eligible studies, six included participants with one or more risk factors that may affect natural conception, such as ovarian surgery, endometriosis, and history of infertility (n=1,907), and the AUC was 0.5927 and the Q index was 0.5698 (Figure 3C). Five studies included participants without known risk factors that may affect natural conception (n=2,481), with an AUC of 0.6042 and a Q index of 0.5786 (Figure 3D).

FIGURE 2
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Figure 2 (A–C) SROC curves of AMH in the prediction of spontaneous clinical in (A) all women; (B) women younger than 35 years; (C) women elder than 35 years. AUC, area under the summary receiver operating characteristic curve; Q*,Cochran’s Q index.

FIGURE 3
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Figure 3 (A–D) SROC curves of AMH in the prediction of spontaneous clinical in (A) prospective subgroup; (B) non-prospective subgroup; (C) subgroup with risk factors for infertility; (D) subgroup without risk factors for infertility. AUC, area under the summary receiver operating characteristic curve; Q*, Cochran’s Q index.

Risk of Bias of Included Studies

The quality assessment of the included studies is shown in Figures 4 and 5. Deeks’ funnel plot did not suggest publication bias (p>0.05, Figure 6). The sensitivity analysis confirmed the robustness of the calculated results (Figure 7). Moreover, a subgroup analysis of study type and population characteristics revealed the same results.

FIGURE 4
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Figure 4 Risk of bias and clinical applicability of the included studies.

FIGURE 5
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Figure 5 Graphical display for QUADAS-2 results.

FIGURE 6
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Figure 6 Deeks funnel for publication of included studies.

FIGURE 7
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Figure 7 Sensitivity analysis.

Discussion

Our meta-analysis indicated a weak predictive value of AMH for spontaneous pregnancy. The heterogeneity analysis confirmed the robustness of the calculated results. Calculations performed after the age stratification did not show an increased predictive ability.

AMH directly reflects the original follicular pool, and its secretion is unaffected by FSH, possessing the advantages of sensitivity and reliability. AMH has gradually replaced basic FSH as the most reliable ovarian reserve biomarker (3). Despite being one of the most widely used ovarian reserve tests in the clinical setting, a uniformly accepted low AMH cutoff is still lacking (3, 32), and the current primary reference is the Bologna Standard of AMH < 0.5–1.1 ng/ml.

In this meta-analysis, the included studies chose different cutoff AMH values detected by different AMH assays of 0.75–2 ng/ml. As a result, a negative correlation between sensitivity and specificity (known as the threshold effect) was presented. To prevent the benefits of the experimentation from being exaggerated, we plotted the SROC curve. The predictive value was limited when the AUC was 0.5–0.7, better when it was 0.7–0.9, and best when it was >0.9. The overall AUC was 0.5932 and the Q index was 0.5702, suggesting a weak predictive ability.

A woman’s serum AMH concentration usually peaks at around 20–25 years of age and gradually decreases with age to undetectable levels (33). The age-related ovarian function decline is generally accompanied by menstrual cycle disorders, ovulation disorders, and oocyte quality reduction, which account for approximately 10% of female infertility cases (34). In addition, decreased estrogen levels also adversely impact endometrial receptivity, the pelvic microenvironment, and other factors, which also leads to a decline in female fertility (34). To fully explore the predictive value of AMH for natural fertility, participants were stratified into older or younger than 35 years of age subgroups. Four studies divided the included participation by age (16, 28, 30, 31), while two studies included only women under 35 years of age (11, 14). An increased AUC and Q index were found in women younger than 35 years of age (0.6355 and 0.6025, respectively). Considering that the AUC was still lower than 0.7, AMH has weak predictive value for spontaneous pregnancy in young women. In women older than 35 years of age, the AUC was 0.5536 and the Q index was 0.5403, indicating poor predictive value.

Our age-stratified results indicated that low serum AMH levels do not necessarily represent decreased natural fertility in younger or older women. Statistics on age-specific AMH levels in Korean women with regular menstrual cycles show that women older than 35 years of age have an AMH level lower than 1.5 ng/ml, a finding that is consistent with the cutoff values that most included studies chose (0.75–2 ng/ml) (35). In younger women, an early decrease in AMH levels suggests an abnormally declined ovarian reserve, which might lead to decreased fertility. However, our meta-analysis showed that the predictive value of AMH for spontaneous pregnancy in this group was limited. AMH levels may be more closely associated with follicle quantity than oocyte quality in young women, which is inferred in some IVF-related studies as well (3638).

Compared to ovarian reserve, regular ovulation and oocyte quality may hold greater significance in spontaneous pregnancy. Our meta-analysis did not further stratify AMH levels into low versus extremely low AMH because of the limited number of original studies. Some researchers believe that active treatment could be considered for young women with extremely low AMH levels, except for those with low AMH levels but no infertility factors (39, 40). Unfortunately, few original studies further divided AMH levels into low and extremely low subgroups; thus, we failed to determine whether there is an improved predictive value. In women of later reproductive age, a significant reduction in ovarian reserve is part of the biological progress due to the accelerated depletion of the follicular pool. Thus, the serum AMH concentration varied from low to undetectable. In this group, a relatively higher AMH concentration might enable a slower follicular failure rate and better conception ability.

A previous meta-analysis synthesized the effect of AMH on implantation, clinical pregnancy, and live birth in IVF, and its results demonstrated that the predictive effect was weak overall, although better but still low in women with DOR. Most studies defined DOR as age >35 years (41, 42). Contrary to the expected outcome, this meta-analysis does not determine a reliable predictive value in women aged >35 years. A decreased AMH level does not indicate decrease natural fertility either. A possible reason for this finding might be that only the oocyte quantity experiences a slower depletion.

A committee opinion on ovarian reserve tests indicated that a suitable crowd should be fully considered. As a screening test, AMH would be more applicable to the general IVF population as well as women at a high risk of DOR than women at a lower risk of DOR (3). However, AMH is more universally applied in clinical practice. Therefore, a confirmed quantitative or qualitative relationship between AMH and natural pregnancy is necessary for clinicians to provide individualized fertility guidance. The findings of our meta-analysis might be complementary to previous opinions about natural pregnancy. Meanwhile, it is important to avoid unnecessary fertility anxiety among reproductive-aged females, especially young nulliparas with decreased serum AMH levels.

To our knowledge, this meta-analysis is the first to examine the effects of AMH for natural pregnancy prediction. Furthermore, we also analyzed the effects in young versus old subpopulations. However, this study has several limitations. First, most primary studies analyzed AMH levels as predictors of reproductive outcomes using a certain cutoff value. However, in clinical practice, the use of only one cutoff value probably does not reflect the biological situation. We considered the factor of age; however, in each age range, further stratification of AMH values may show increasing predictive value. Unfortunately, studies dichotomized the data using a certain cutoff value, resulting in a non-differential classification error. Second, not all studies were performed in an age-stratified manner. The limited number of subgroup studies might affect the accuracy of the SROC curve. In addition, the included studies were mainly from western countries, which might restrict the application of their findings to other races. Additionally, different AMH assays were performed. Incomparable values and measurement deviations may influence the conclusions. Considering that our meta-analysis only assessed the predictive value of AMH for natural pregnancy, its predictive value for other important reproductive outcomes, such as live birth, requires further exploration.

In conclusion, the findings of existing studies vary regarding whether AMH levels can predict natural pregnancy, and our meta-analysis suggested weak predictive value of serum AMH level for natural clinical pregnancy. A decreased AMH level does not represent decreased natural fertility in young or old females. Thus, caution should be exercised regarding the appropriate application of AMH measurements, especially in pre-conception counseling, to avoid over-interpreted and unnecessary fertility anxiety.

Author Contributions

CL performed the literature screening, the data extraction, the analyses, and the drafting of the manuscript. MJ performed the literature screening, data extraction. CL and MJ have contributed equally to this work. WZ reviewed the protocol. XT and QC drafted the protocol. XW and YZ extracted the baseline characteristic. RZ contributed to the literature inclusion and revised the manuscript for important intellectual content. All authors contributed to the article and approved the submitted version.

Funding

Zhejiang University Education Foundation Global Partnership Fund, Fundamental Research Funds for the Central Universities, Key Research and Development Program of Zhejiang Province (No. 2021C03098).

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s Note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Acknowledgments

We would like to express our gratitude to Professor Yunxian Yu from Zhejiang University, School of Public Health for his guidance on analytical methods.

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Keywords: AMH, spontaneous pregnancy, meta-analysis, fertility, anti-Müllerian hormone

Citation: Lin C, Jing M, Zhu W, Tu X, Chen Q, Wang X, Zheng Y and Zhang R (2021) The Value of Anti-Müllerian Hormone in the Prediction of Spontaneous Pregnancy: A Systematic Review and Meta-Analysis. Front. Endocrinol. 12:695157. doi: 10.3389/fendo.2021.695157

Received: 14 April 2021; Accepted: 15 September 2021;
Published: 13 October 2021.

Edited by:

William Leigh Ledger, University of New South Wales, Australia

Reviewed by:

Ludwig Wildt, Innsbruck Medical University, Austria
Rodolfo A. Rey, Centro de Investigaciones Endocrinológicas “Dr. César Bergadá” (CONICET), Argentina

Copyright © 2021 Lin, Jing, Zhu, Tu, Chen, Wang, Zheng and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Runju Zhang, NTMxMTAwNUB6anUuZWR1LmNu

These two authors have contributed equally to this work and share first authorship

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.