Specific fetal sex test
Primarily answers the fetal sex question and is not equivalent to full chromosome screening.
A specific test for a specific question
Finding out fetal sex from maternal blood
This test is for patients who want fetal sex information without requesting full chromosome screening. Before collection we confirm the timing and conditions of the specific method used.
- Obstetric consultation
- Advanced ultrasound
- Laboratory and screening
- Late-pregnancy monitoring
- Nutrition
Complementary follow-upAskabide + Osakidetza · birth at the reference hospital
How it works
A maternal blood sample is collected and circulating genetic material is analysed for information related to sex chromosomes. Collection is similar to a routine blood test.
The minimum gestational age, turnaround and conditions depend on the current method; Askabide confirms them when the test is booked rather than publishing details that may become outdated.
Difference from NI/+
Calderón NI/+
Estimates risk across all chromosomes and CNVs >7 Mb and can include fetal sex.
Open informationLimitations and repeat samples
Gestational age, the amount of fetal genetic material and other factors may affect the result. An inconclusive result may require a new sample.
Genetic fetal sex information does not replace anatomical ultrasound and says nothing definitive about overall fetal health.
Before attending
- Confirm the applicable minimum gestational age.
- Ask about the estimated report time.
- Mention twin pregnancy, transfusion, transplant or another relevant circumstance.
- Choose whether you want fetal sex only or expanded prenatal screening.