Role of anti mullerian hormone (AMH) in diagnosis of polycystic ovarian syndrome (PCOS) in Indian women

Introduction

Polycystic ovary syndrome (PCOS) is a complex disorder that manifests a spectrum of clinical features. These features can vary in severity and can affect metabolic functions as well as reproductive endocrine functions. The symptoms of PCOS are heterogeneous and can range from mild to severe.

The pathophysiology of polycystic ovary syndrome (PCOS) is believed to be polygenic and multifactorial, meaning that it involves the interaction of multiple genetic and environmental factors. This complexity makes it challenging to pinpoint a single cause for PCOS, but research suggests that it may involve abnormal hormone levels, insulin resistance, and chronic low-grade inflammation. The exact mechanisms underlying PCOS pathophysiology are still being studied and remain a subject of ongoing research.

According to the Rotterdam criteria of 2003, polycystic ovarian syndrome (PCOS) is normally diagnosed by the appearance of at a minimum two of the following three criteria:

Oligo and Anovulation

Hyperandrogenism

Polycystic Ovaries

PCOS is a common disorder among young women of reproductive age, with a prevalence of around 20-30%. Women with PCOS often have insulin resistance, dyslipidemia, and central obesity, which can increase their risk of developing diabetes and cardiovascular disease.^[1], ^[2] Ovarian reserves can be assessed using biochemical and ultrasound parameters, with anti-mullerian hormone (AMH) being a more reliable indicator of ovarian reserve than FSH and oestradiol levels.^[3] AMH levels decrease steadily with age, from 24 to 50 years old.^[4] AMH levels are directly related to the antral follicle count and are a better marker for ovarian reserve than FSH and oestradiol levels. The involvement of AMH in the pathophysiology of PCOS has led to discussions about its potential use as a more sensitive and specific marker for diagnosis, particularly as a replacement or adjunct to ultrasonography for the detection of polycystic ovaries. In healthy, reproductive-aged women the ovaries and the adrenal cortex share the bulk of the steroid biosynthesis pathways, with relatively equal contributions to the circulating levels of testosterone and androstenedione. The ovaries and the adrenal cortex both secrete more androstenedione than testosterone, but ~50% of circulating testosterone is derived from the peripheral metabolism of and rostenedione.^[5], ^[6], ^[7], ^[8], ^[9] Within the ovary, the theca interna layer within the ovarian follicle produces androgens, whilst within the adrenal cortex; it is the zona fasciculate responsible for synthesis.^[10]

Materials and Methods

Results

On correlating AMH level with various study parameters in PCOS patients, there was significant negative correlation was observed between AMH level with LH and FSH level (p<0.001 and p<0.001), and a positive correlation was observed with T3 level (p=0.014). No significant correlation was observed between AMH level with age, BMI, FBS, T4, TSH, testosterone, prolactin, AFC, ovary volume, and estragon.

The [Table 2] shows that the best cut-off value of AMH level was 4.70 with a sensitivity of 90% and specificity of 90.60% and the p-value was statistically significant. Based on the current study findings and ROC data table, the cut-off for AMH level between 4.70 units seems appropriate in delineating PCOS subjects and control subjects as it has a high level of sensitivity and specificity.

Logistic regression of various factors with PCOS shows that.

From the [Table 3] show the variable which has the maximum influence on the occurrence of PCOS is the serum anti-mullerian hormone levels.

The odds ratio for age and FSH levels were not significant and hence cannot be accounted as an association with the occurrence of PCOS

Elevated serum levels of LH, testosterone, and AMH were found statistically significant predictors of PCOS, with AMH levels demonstrating high odds of developing the disease.

Discussion

Polycystic ovary syndrome is a set of symptoms related to a hormonal imbalance that can range from mild to severe and it has reproductive, endocrine, and metabolic implications.^[5] PCOS is one of the leading causes of female subfertility and the most common endocrine disorder among women of reproductive age. Despite many decades of extensive research, the exact etiology and pathogenesis of this complex disorder remain hidden. The use of ultrasound to diagnose PCOS can be problematic; the interpretation of ultrasound results may demand subjective judgments and is subjected to interobserver variability.^[11] Moreover, most of the target population is teenagers and women of reproductive age, and they may be unavailable for transvaginal ultrasound evaluation because of their virginal status or obesity.^[12] In addition to unclear diagnostic criteria, the presence of different phenotypes with PCOS further complicates the diagnosis. The technical advances in imaging have led to an artificial increase in PCOM resulting in confusion over its use as diagnostic criteria. The diagnosis of PCOS requires objectives and quantitative criteria to help clinicians to diagnose and treat patients suffering from this complex endocrine disorder. AMH is a promising marker for this condition, as its concentration is stable throughout the menstrual cycle and is not affected by fluctuations of other reproductive hormones.^[5], ^[13]

Although AMH serum levels are used as a predictive marker of ovarian response during IVF, there are conflicting reports of its predictive value for folliculogenesis in ovulation induction with clomiphene citrate.^[5]

Measuring AMH levels allows for the further investigation of PCOS and its clinical implications. The present study aims to assess the diagnostic power of serum AMH for the diagnosis of PCOS and analyze if serum AMH can replace PCOM in Rotterdam Criteria and also analyze the correlation of AMH with hyperandrogenaemia. In the present study, there was no statistical difference between the mean age of PCOS cases and controls this finding correlates with the study of Singh et al.,^[14] in which no statistically significant difference was found between the mean age of the PCOS group and control group.

A similar finding was also observed by Ahmed et al.^[15] Saxena et al.,^[16] and Sahmay et al^[17] however, a different result was found in a study by Wiweko et al^[18] Johnstone et al.^[19] and Hsu, M. I.,^[20] in which the average age of PCOS patients were significantly younger than non-PCOS patients, they concluded that the proportion of women with PCO decreased with age. In our study the mean age of menarche was also comparable and statistically not significant between PCOS and the control group. In the present study, the mean BMI in the PCOS group was significantly high in PCOS group as compared to the control group.

PCOS tends to affect women of reproductive age, but it can also occur in younger or older women. It would be important to investigate further whether age is a significant factor in the development of PCOS or if it has any impact on the diagnostic power of serum AMH. AMH levels were found to be substantially higher in the PCOS group compared to the control group in the current study; the median AMH levels in the PCOS group were 7.1686 ±2.73776 ng/ml, which was nearly twice as high as the 3.8034± 0.63199 ng/ml in the control group (p <0.001). According to a study, women who meet all three of the Rotterdam criteria and have an AMH level of at least 11 ng/ml have an 80% chance of having PCOS.^[7] In a study, 97% of women with AMH levels greater than 10 ng/ml had PCOS.^[8]

In the present study, a cut-off of 4.70 ng/ml with sensitivity and specificity of 90% and 90.60%, was found as the best diagnostic potential of AMH. A similar cut-off of AMH of 4.90 ng/ml with a higher sensitivity and specificity of 92% and 97%, respectively, was reported by Dewailly et al.^[9] Hence, they concluded that AMH is a more accurate predictor than follicle counts per ovary because it not only indicates AFC but also the level of hyperandrogenism.

Conclusion

The current Rotterdam criteria, PCOM, are used to diagnose PCOS, a complex and widespread gynecological disorder. PCOM is extremely subjective and has poor reproducibility.

Despite the fact that its sensitivity and specificity on their own are weak and no single cut-off of AMH is diagnostic, AMH is a promising method of diagnosis for PCOS as an addition to the current Rotterdam criteria. This is especially the case when it is used to replace PCOM. The fact that AMH is a biological, objective, quantitative marker that is unaffected by the day of menstruation or OCP ingestion gives it further advantages as a diagnostic tool. Therefore, more research should be done in the future to support its use as a PCOS diagnostic tool.

Source of Funding

None.

Conflict of Interest

None.