Vitamin K1 in the newborn

Area of Science:

• Biochemistry
• Neonatal Medicine
• Maternal-Fetal Health

Background:

• Vitamin K1 is essential for blood clotting.
• Previous studies indicated lower vitamin K1 levels in newborns compared to mothers.
• Understanding vitamin K1 transfer across the placenta is crucial for neonatal health.

Purpose of the Study:

• To accurately measure vitamin K1 concentrations in maternal and neonatal blood.
• To investigate the relationship between maternal and neonatal vitamin K1 levels.
• To determine the most effective method for obtaining cord blood samples for vitamin K1 analysis.

Main Methods:

• Utilized a sensitive high-performance liquid chromatography (HPLC) method for precise vitamin K1 quantification.
• Collected blood samples from full-term, uncomplicated pregnancies from both mothers and their neonates.
• Analyzed venous, arterial, and mixed cord blood samples.

Main Results:

• Established a reliable method to measure vitamin K1 down to 0.5 nmol/l.
• Neonatal vitamin K1 concentrations were found to be approximately 50% of maternal levels.
• No significant differences were observed between venous, arterial, and mixed cord blood vitamin K1 levels.

Conclusions:

• A partial placental barrier likely restricts vitamin K1 transfer from mother to fetus.
• Umbilical vein blood sampling is adequate for assessing neonatal vitamin K1 status.
• Findings support the need for potential vitamin K1 supplementation in newborns.