Dr Daniel J Bell and Radswiki et al.

Cordocentesis is a method of fetal blood sampling which is usually carried out under ultrasound guidance.

It may be performed for various reasons which include:

Usually, a 20-gauge spinal needle is inserted under direct sonographic guidance towards the umbilical vein.  A typical sampling site would be where the segment of the umbilical cord is closest to the placenta where the cord is relatively fixed. The presence of a posterior placenta increases the difficulty of the procedure and in such cases, a muscle relaxant may be required prior to the procedure to immobilize the intervening fetus.

There is a higher complication rate if performed prior to 20 weeks. An associated fetal loss rate as high as 4% has been reported 2.

Recognized complications include:

Share article

Article information

rID: 15266
Tag: cases
Synonyms or Alternate Spellings:
  • Cordocenteses
  • Umbilical vein sampling
  • Fetal blood sampling
  • Percutaneous umbilical cord blood sampling (PUBS)
  • Percutaneous umbilical cord blood sampling

Support Radiopaedia and see fewer ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.