Integrated Screen, Part 1
Test code(s) 16148, 16976 (NY)Question 1. Why were we not provided with a Down syndrome and trisomy 18 risk after the first part of the integrated screen?
The integrated screening test provides a single risk assessment for Down syndrome and trisomy 18 in the second trimester after the second sample has been analyzed. To complete the test and obtain a final result please submit a second trimester sample within the date range provided on the report.
Question 2. The report indicates a different gestational age than what I determined. How is the gestational age calculated?
The gestational age is derived from the crown rump length (CRL) provided, using criteria from the Fetal Medicine Foundation. If the CRL is not provided, the gestational age is derived from the estimated date of delivery (EDD) and the collection date provided and is an exact calculation by calendar days. Gestational wheels may be inaccurate by several days or more.
Note that the gestational age is reported in decimal weeks. For example, 11 weeks 4 days is reported as 11.6 weeks.
Reference
- ACOG Committee on Practice Bulletins. ACOG Practice Bulletin No. 77: screening for fetal chromosomal abnormalities. Obstet Gynecol. 2007;109:217-227.