You will be shown biomedical passages and your task is to the answer the provided question. Provide a concise and accurate response and do not include any additional text in the response other than the answer.

Question: How early during pregnancy does non-invasive cffDNA testing allow sex determination of the fetus?

Context: The use of cffDNA in fetal sex determination during the first trimester of pregnancy of female DMD carriers.
We determined fetal sex during the first trimester using a quantitative real-time polymerase chain reaction (PCR) assay of cffDNA in pregnant carriers of DMD.
Early fetal gender determination using real-time PCR analysis of cell-free fetal DNA during 6th-10th weeks of gestation.
Considerable 97.3% sensitivity and 97.3% specificity were obtained in fetal gender determination which is significant in the first trimester of pregnancy.
Therefore in this study, the probability of detecting sequences on the human Y-chromosome in pregnant women has been evaluated to identify the gender of fetuses. Peripheral blood samples were obtained from 80 pregnant women with gestational age between 6th to 10th weeks and the fetal DNA was extracted from the plasma.
We evaluated the feasibility and accuracy of non-invasive fetal gender determination using quantitative fluorescent-polymerase chain reaction (QF-PCR) analysis of circulating cffDNA in the first-trimester maternal plasma.
This study aims to validate a reliable method for non-invasive prenatal diagnosis of fetal gender using maternal plasma cell-free fetal DNA (cffDNA) for fetal sex assessment in the first trimester of pregnancy and test its clinical utility in the diagnosis of potentially affected pregnancies in carriers of X-linked disorders.
We performed a review of the published literature evaluating the use of cffDNA and ultrasound for prenatal determination of fetal sex during the first trimester of pregnancy.
The use of cffDNA in fetal sex determination during the first trimester of pregnancy of female DMD carriers
We performed a review of the published literature evaluating the use of cffDNA and ultrasound for prenatal determination of fetal sex during the first trimester of pregnancy
Fetal Sex Determination using Non-Invasive Method of Cell-free Fetal DNA in Maternal Plasma of Pregnant Women During 6(th)- 10(th) Weeks of Gestation
US allows reliable fetal sex determination only during the second trimester.
6th to 10th week of gestation, or first trimester of pregnancy