The cell-free fetal DNA fraction in maternal blood decreases after physical activity

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  • Jacob Mørup Schlütter
  • Lotte Hatt, Department of Obstetrics and Gynecology, Horsens Regional Hospital
  • ,
  • Cathrine Bach, Denmark
  • Ida Kirkegaard
  • Steen Kølvraa, Department of Clinical Genetics, Vejle Hospital, Vejle, Denmark., Syddansk Universitet, Denmark
  • Niels Uldbjerg

OBJECTIVE: If noninvasive prenatal testing using next generation sequencing is to be effective for pregnant women, a cell-free fetal DNA (cffDNA) fraction above 4% is essential unless the depth of sequencing is increased. This study's objective is to determine whether physical activity has an effect on the proportion of cell-free DNA (cfDNA) arising from the fetus (fetal fraction).

METHODS: Nine pregnant women carrying male fetuses at gestational age 12(+0)  weeks to 14(+6)  weeks were included. Plasma from nine pregnant women was drawn prior to, immediately after, and 30 min after 30 min of cycling with a pulse-rate of 150 beats per minute. The concentrations of cffDNA (DYS14) and cfDNA (RASSF1A) were assessed using quantitative real-time polymerase chain reaction.

RESULTS: The fetal fraction decreased significantly in all participants after physical activity (p < 0.01), a decrease varying from 1-17 percentage points. This was due to a significant increase in the concentration of cfDNA (p < 0.01), whereas the concentration of cffDNA remained the same. This alteration of the fetal fraction was not present 30 min after physical activity.

CONCLUSION: When planning the timing of noninvasive prenatal diagnosis based on the fetal fraction, physical activity prior to sampling should be avoided. © 2013 John Wiley & Sons, Ltd.

Original languageEnglish
JournalPrenatal Diagnosis
Pages (from-to)341-4
Number of pages4
Publication statusPublished - Apr 2014

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