Vitamin D Deficiency Is Associated With Poor Ovarian Stimulation Outcome in PCOS but Not Unexplained Infertility
Samantha F Butts, David B Seifer, Nathanael Koelper, Suneeta Senapati, Mary D Sammel, Andrew N Hoofnagle, Andrea Kelly, Steven A Krawetz, Nanette Santoro, Heping Zhang, Michael P Diamond, Richard S Legro, Eunice Kennedy Shriver National Institute of Child Health and Human Development Reproductive Medicine Network, Samantha F Butts, David B Seifer, Nathanael Koelper, Suneeta Senapati, Mary D Sammel, Andrew N Hoofnagle, Andrea Kelly, Steven A Krawetz, Nanette Santoro, Heping Zhang, Michael P Diamond, Richard S Legro, Eunice Kennedy Shriver National Institute of Child Health and Human Development Reproductive Medicine Network
Abstract
Context: The impact of vitamin D deficiency on the success of ovarian stimulation according to underlying infertility diagnosis has not been investigated.
Objective: To evaluate the relationship between vitamin D deficiency and reproductive outcomes after ovarian stimulation in women with either polycystic ovary syndrome (PCOS) or unexplained infertility.
Design: Retrospective cohort study.
Setting: Analysis of randomized controlled trial (RCT) data.
Participants: Participants from the Pregnancy in Polycystic Ovary Syndrome II (PPCOS II) RCT (n = 607); participants from the Assessment of Multiple Intrauterine Gestations from Ovarian Stimulation (AMIGOS) RCT of unexplained infertility (n = 647).
Interventions: Serum 25(OH)D levels measured in banked sera.
Main outcome measures: Primary: live birth; secondary: ovulation (PPCOS II), pregnancy, and early pregnancy loss.
Results: In PPCOS II, subjects with vitamin D deficiency [25(OH)D < 20 ng/mL or 50 nmol/L] were less likely to ovulate (adjusted OR, 0.82; 95% CI, 0.68 to 0.99; P = 0.04) and experienced a 40% lower chance of live birth (adjusted OR, 0.63; 95% CI, 0.41 to 0.98; P = 0.04) than those not deficient. In AMIGOS, no significant association between vitamin D deficiency and live birth was noted. In pregnant subjects from both studies, vitamin D deficiency was associated with elevated risk of early pregnancy loss (OR, 1.6; 95% CI, 1.0 to 2.6; P = 0.05).
Conclusions: In this investigation of women pursuing ovarian stimulation, the association between vitamin D deficiency and diminished live birth relied on carrying the diagnosis of PCOS and was not observed in unexplained infertility. Given the generally modest success of ovarian stimulation, addressing vitamin D deficiency may prove an important treatment adjunct for many infertile women.
Trial registration: ClinicalTrials.gov NCT00719186 NCT01044862.
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Source: PubMed