Background introduction
Down syndrome screening is a genetic test performed during the first trimester of pregnancy to screen the fetus for genetic defects such as Down syndrome. In addition, Down syndrome screening results can also predict the gender of the fetus. So, how to determine the gender of the fetus in the Tang screening results?
Version analysis
Tangsie has two ways of writing results, one is expressed in numbers, such as \”1/10000\”, and the other is classified as \”high/low risk\”, such as \”high risk/low risk\”. In both of these results, the gender of the fetus can be inferred.
Numerical results are based on the proportion of \”X\” and \”Y\” chromosome content. If it contains a Y chromosome, it is a male fetus, otherwise it is a female fetus. In the \”high/low risk\” category, the judgment is based on the proportion of sex hormones. If the levels of human chorionic gonadotropin (HCG) and free estriol (E3) are higher than the normal reference value, it may be a male fetus; if it is lower than the normal reference value, it may be a female fetus.
Interpretation of numerical results
Tangsi digital results are usually in the form of \”1/XXX\” or \”1:XXX\”. Among them, \”1\” indicates how much the risk of pregnancy increases compared with the risk of the overall population; \”XXX\” indicates the incidence of fetal Down syndrome, such as \”1/10000\” represents the occurrence of Down syndrome The rate is 1/10000.
In the numerical results, fetal gender is inferred based on the proportion of Y chromosome content. Normally, the cells of a male fetus contain one Y chromosome and one X chromosome; while the cells of a female fetus contain two X chromosomes. If the Tang screening results show that the Y chromosome content ratio is higher than the normal reference value, it may be a male fetus; otherwise, it may be a female fetus.
Interpretation of high/low risk classification
Tangsie classification results are usually \”high risk\”, \”low risk\”, or \”lower risk\”, etc. Among them, \”high risk\” means that at this risk, the risk of genetic defect diseases such as Down syndrome is higher than the normal reference value. \”Low risk\” is the opposite, indicating that the probability of Down syndrome is low for that pregnancy risk.
In the high/low risk category, fetal gender is estimated based on the ratio of human chorionic gonadotropin (HCG) and free estriol (E3). If both HCG and E3 are higher than the normal reference values, it may be a male fetus; otherwise, it may be a female fetus.
Notes
Although Tang screening results can predict the gender of the fetus, its prediction accuracy is not 100%. Therefore, the Tang screening results cannot be used as accurate fetal gender diagnosis results and are for reference only. In addition, Tang screening should be performed under the guidance of professionals to obtain more reliable results.
All in all, the fetal gender can be inferred through the results of Tang screening, but Tang screening is not an accurate method for fetal gender diagnosis and can only be used as a reference. When performing Tang screening, you should follow the advice of professionals and strictly follow the operating procedures.
