UCSF Navigation Bar

UCSF Departments of Pathology & Laboratory Medicine Home Page

Lab Manual for UCSF Clinical Laboratories

Lab Manual for SFGH

Internal Resources

Click here for more information about laboratory operations and procedures

If you have additional questions regarding this test, please call: 415-353-1667

Search Our Test Menu

Prenatal Screen, Cell-free DNA

Item Value
Available Stat? No
Test code CFFD
Performed by Counsyl
Sendout? Yes
Method Massively parallel sequencing
Collection Instructions Draw two BCT black/tan tubes per patient. Fully completed Counsyl requisition/kit required before draw.
Container type Cell-Free DNA (cfDNA) BCT Tube
Amount to Collect 10 mL blood
Sample type Whole blood
Preferred volume 10 mL blood
Min. Volume 10 mL blood
Processing notes Do not aliquot. Maintain at ambient temperature.
Ref Lab Rejection Criteria Gestational age <10 weeks; incorrect or expired blood tube; quantity not sufficient for analysis; specimen received more than five days from collection; excessive hemolysis; frozen specimens
Normal range
Synonyms Counsyl Prelude Prenatal Screen, NIPT, Non-invasive Prenatal Test
Stability 5 days
Turn around times 7 days days
Additional information Determination in women at high risk for fetal trisomies 13, 18, and 21 who are pregnant with twins or a single fetus of at least 10 weeks' gestation. Test results that suggest high risk for fetal trisomy should prompt consideration for genetic counseling and/or additional genetic testing. Test results that suggest low risk for fetal trisomy should be reviewed with the patient by the health care provider. Results should be considered in the context of other clinical criteria.
CPT coding 81599-90
Last Updated 1/10/2018 11:22:01 AM
Entry Number 1574
UCSF home page UCSF home page About UCSF Search UCSF UCSF Medical Center