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These may include pregnancy testing, complete blood count to assess for anemia, thyroid function tests (as thyroid disorders commonly affect menstrual cycles), and reproductive hormone panels measuring FSH, LH, estradiol, and prolactin levels

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[It] also aids in DNA synthesis and is involved in the metabolism of carbohydrates, fats, and proteins." Because it's so important, those with this type of vitamin deficiency, which is diagnosed via a blood test, are usually recommended to take either supplements or get regular B12 shots