In women, abnormal development of the Mullerian ducts can lead to a condition known as uterus didelphys, in which the woman has a double set of reproductive tract organs-two each of the uterus, cervix, and vagina.
This test measures the level of Vitamin B6, or Pyridoxine, in the blood. It is recommended that the patient avoid alcohol and vitamins for 24 hours before testing. This Vitamin B6 Test is a blood test. An 8-12 hour fast is recommended before testing. It typically takes 4 business days or less.
So look on your lab sheet to check and see which blood tests they will be doing and then call the lab to see if there is a requirement to fast before doing any of them. Ask them your question about how long to fast. When I did A1c years ago, there was a 12 hour fast before hand as I recall.