Vitamin D Status Among Infertile Women in Sweden

Vitamin D Status, Its Determinants and IVF Outcomes Among Infertile Women in South-Western Sweden.

The goal of this prospective cohort study is to learn about the overall and seasonal prevalence of vitamin D insufficiency and its determinants in a population of women with infertility who will go through in vitro fertilization in Sweden. The main questions it aims to answer are:

• What is the prevalence of vitamin D insufficiency?
• What are the determinants of this insufficiency? Participants will be asked to complete a questionnaire validated for dietary assessment of vitamin D intake and sun exposure habits and they will leave a blood sample for measurement of 25(OH)D concentration.

Researchers will compare the in vitro fertilization outcomes between women with vitamin D insufficiency and sufficiency to see if there is any difference.

Inclusion Criteria:

• women aged 18-38 years, who will go through in vitro fertilization for infertility.

Exclusion Criteria:

• women who will go through pre-implantation genetic testing
• women who will go through sperm- or oocyte donation treatment
• Fertility preservation cycles