Body Mass Index (BMI) dependent effect of thyroid stimulating hormone (TSH) and gonadotropins on ovarian reserve markers in the secondary infertile women at fertile age.
Abstract Background: Infertility is a medical condition when a couple fails to conceive after having regular unprotected intercourse without the use of any contraceptive, it a complex global health issue that can be primary with no previous conception or secondary with one or more previous conceptions. A number of anomalies in the reproductive track govern the state of infertility in female of reproductive age.Materials and Methods: The study was conducted on 100 secondary infertile women based on BMI groups {Normal 18-23.9 kg/m2 (N=35) and Overweight 24-27 kg/m2 (N=65)}, attending tertiary care infertility center: Lahore Institute of Fertility and Endocrinology, Hameed Latif Hospital. The present analytical cross sectional study was conducted to assess the BMI based combinatorial effect of gonadotropins with thyrotropin and ovarian reserve markers in secondary infertile women. Serum hormonal levels of TSH, LH, FSH and AMH were measured by using Roche electrochemiluminescence immunoassay (ECLIA) and AFC was recorded by transvaginal ultrasonography. The results were statistically analyzed by Spearman correlation test using XLSTAT, considered significant at p-value <0.05. Results: A total of 18% of secondary infertile women with normal BMI were found to have a lower serum TSH levels (<0.27µIU/ml) which can be characterized as hyperthyroidism as compared to overweight population. A strong significant positive correlation was found in the TSH, age and BMI, however, these factors were found to be negatively correlated with AMH and AFC. Gonadotropins level was increased with increase in TSH levels among participants with normal BMI but decreased with TSH escalation values among overweight population. Conclusion: TSH was found to be one of the most important diagnostic factors of infertility must be monitored in relation with other parameters (AMH, AFC, FSH, and LH) in order to spot instigation point, as it directly acts upon ovulation surge by controlling gonadotropins related actions on ovarian reserve. Weight should also be assessed regularly with age to minimize the infertility issues.