[Expert Explanation] What Is Prenatal Genetic Testing? When and How It Reveals Your Baby's Talents and Constitution

Rewritten on: April 18, 2026

A thorough explanation of testing that analyzes fetal DNA from a mother's blood during pregnancy to determine genetic tendencies across 30 to 50 traits, including talent and constitution. Covers testing timing, the difference from NIPT, the steps for testing, and the relationship between genetics and environment.

What is genetic testing for talent and constitution during pregnancy: This test reads fetal-derived DNA (cell-free fetal DNA: cffDNA) contained in the mother's blood during pregnancy using the latest analysis technology to identify genetic traits at an early stage. From week 10 of pregnancy onward, it is possible to assess 30 to 50 traits, including memory, mathematical ability, height tendency, and susceptibility to weight gain. This allows parents to consider a parenting plan tailored to their baby's individual characteristics even before birth, offering a valuable clue for spending the pregnancy period more positively. (1)

In recent years, rapid advances in genetic analysis technology have made it possible to accurately read the trace amounts of fetal-derived DNA contained in maternal blood. In particular, the sophistication of next-generation sequencing (NGS) and microarray analysis has made it possible to simultaneously scan hundreds of thousands of SNPs (single nucleotide polymorphisms) or more—something that was previously difficult—enabling a more multifaceted assessment of a fetus's genetic tendencies. This technological background developed rapidly alongside the practical application of NIPT (non-invasive prenatal genetic testing), and analysis using cffDNA in maternal blood is widely recognized as an established method in the fields of obstetrics and medical genetics. (1)(2)

What Is Genetic Testing That Reveals a Fetus's Talent and Constitution?

A mother's blood during pregnancy contains trace amounts of fetal DNA that pass through the placenta. Thanks to dramatic advances in genetic analysis technology, including next-generation sequencing (NGS), it has become possible to read this trace amount of DNA with high precision. Because the test can be completed with just a small sample of maternal blood, no invasive procedure such as amniocentesis is required, making it a major advantage in terms of safety for both mother and baby. (3)

Cell-free fetal DNA (cffDNA) appears in maternal blood from early pregnancy and its concentration rises as gestation progresses. The accuracy of the test is therefore closely tied to gestational week; generally, once past week 10 of pregnancy, cffDNA concentration reaches a sufficient level, allowing stable detection of the many SNPs (single nucleotide polymorphisms) associated with talent and constitution. The proportion of cffDNA in maternal blood is called the "fetal fraction," and it has been reported to be approximately 10 to 15% around week 10 of pregnancy, rising further in the later stages of pregnancy. Once this fetal fraction exceeds a certain threshold, the reliability of SNP analysis is assured. (2)

How the Test Works and When Results Become Available

cffDNA in maternal blood is extracted and amplified, and microarray analysis or NGS analysis is performed to simultaneously read hundreds of thousands to millions of SNP sites. Testing institutions cross-reference this data against a massive genetic-statistical database, calculating results by quantifying the degree of association between each SNP and traits related to talent and constitution. Specifically, genome-wide SNP data is fed into a statistical model called a Polygenic Score (PGS), which evaluates the cumulative effect of multiple genetic variants as a single numerical index. This polygenic score has become widely used in recent genomic science for predicting behavioral traits and physical characteristics. (1)

• Weeks 6 to 9 of pregnancy: By analyzing the presence or absence of the Y chromosome, it is possible to determine the baby's sex. Since cffDNA concentration is not yet sufficient at this stage, analysis is focused specifically on sex determination.
• From week 10 of pregnancy onward: In addition to sex, genetic tendencies related to talent and constitution can be assessed simultaneously. Because cffDNA concentration has risen sufficiently by this stage, testing accuracy is stable. Testing after this point is recommended in order to carry out SNP analysis across multiple traits.

Specific Examples of Talent and Constitution Traits That Can Be Assessed

Based on the combination of SNPs inherited from both parents, 30 to 50 items can be examined. Recent genome-wide association studies (GWAS) have identified numerous SNPs that show a statistically strong correlation with specific phenotypes, and this knowledge is applied in this test. For example, thousands of SNPs related to height alone have been identified, and some studies suggest that the polygenic score calculated by combining these can explain approximately 40% of the variation in height between individuals. (4)

• Talent-related traits: Memory, mathematical ability, spatial awareness, language ability, musical sense, athletic ability (including tendencies toward explosive power or endurance), concentration, and creative tendencies can be assessed.
• Constitution-related traits: Height tendency, susceptibility to weight gain (obesity risk), mood tendency (stress tolerance), sleep duration tendency, allergy sensitivity, caffeine metabolism, genotypes related to alcohol metabolism, UV sensitivity, and risk of lactose intolerance can be assessed.
• Athletic-related traits: Tendencies toward a sprinter type or marathon-runner type based on variants of the ACTN3 gene (a gene associated with fast-twitch muscle fiber) may also be included among the items assessed.

These test items merely represent "genetic tendencies" and are not a definitive diagnosis. Since both genetic and environmental factors influence phenotypes, it is recommended to use the results as reference information and to remain flexible in considering daily parenting and educational approaches. It is important to understand that the scores and tendency values shown in the test results are based on statistical probabilities and do not determine an individual's future.

The Relationship Between cffDNA Concentration and Gestational Week

cffDNA (cell-free fetal DNA) is released into maternal blood through the natural process of apoptosis (cell death) in placental trophoblast cells. Although it can already be detected in early pregnancy (around weeks 5 to 7), the fetal fraction at this stage is often only a few percent, which can be insufficient for multi-item SNP analysis. Once past week 10 of pregnancy, the fetal fraction reaches an average of 10% or more, giving both high sensitivity and specificity to the test. Also, if the mother's BMI (body mass index) is high, or in the case of twin pregnancies, the fetal fraction ratio can be affected, so it is important to receive an explanation of these points during pre-test counseling. Note that cffDNA disappears quickly from maternal blood within a few hours after delivery, so there is basically no concern that residue from a previous pregnancy will contaminate testing in a subsequent pregnancy. (2)

What Are the Benefits of Learning Your Baby's Individuality During Pregnancy?

Learning about your baby's genetic individuality before birth allows you to convert vague anxiety into concrete preparatory actions and to develop a clear parenting plan. This scientifically grounded information can be a great source of reassurance, especially for first-time parents or families who want to share their parenting approach with a partner. Pregnancy is a time when hormonal changes can make one prone to emotional instability, but knowing your baby's traits in advance is thought to contribute to psychological stability as well.

Reducing Anxiety and Optimizing Preparation for Childbirth

Many people experience anxiety during pregnancy, wondering "Is my baby healthy?" or "What kind of child will they grow up to be?" Learning about a baby's genetic traits early on directly helps reduce this parental anxiety. (1)

• You can consider a parenting plan or the direction of extracurricular activities tailored to your baby's individuality even before birth. For example, if SNPs associated with athletic ability show a strong tendency, you could use this as an early opportunity to prepare for sports activities after birth.
• Knowing the sex and genetic tendencies makes the baby in the womb feel closer, increasing the joy of choosing a name or preparing the nursery, and deepening family bonds.
• Sharing test results with a partner or grandparents is expected to have a positive psychological effect, allowing the whole family to welcome the baby's arrival together.
• Knowing genetic tendencies related to allergy sensitivity allows you to systematically prepare the living environment before birth (such as bedding choices and plans for living with pets).
• Even if a tendency toward weight gain is shown, it can serve as motivation to more consciously design nutritional balance in postpartum breastfeeding and weaning plans, helping with health management from an early stage.

A Starting Point for Evidence-Based Parenting

Traditional parenting has tended to rely heavily on rules of thumb and intuition, but adding genetic test results as one indicator allows for a more evidence-based approach. Of course, genetic tendencies are not a definitive indicator of the future and are greatly influenced by environment and education throughout the growth process. However, having information such as "our child may have a strength in this particular area" can help you see your child's potential from a broader perspective. In fact, personalized education based on genetic information is attracting attention worldwide, and research reports are beginning to emerge suggesting that optimizing the learning environment according to genetic predisposition is effective for developing a child's abilities. What matters is not treating the genetic test results as the "one correct answer" in a fixed way, but flexibly using them as "one piece of reference information" to enrich parenting. (5)

The Difference from Conventional Prenatal Diagnosis (NIPT)

Genetic testing for talent and constitution and NIPT (Non-Invasive Prenatal Testing), which examines disease risk, both share the common feature of using cffDNA in maternal blood, but they clearly differ in purpose and target. According to the Ministry of Health, Labour and Welfare's "Report of the Expert Panel on Prenatal Testing Including NIPT," NIPT is a genetic test for detecting numerical chromosomal abnormalities in the fetus (such as trisomy 13, 18, or 21). Genetic testing for talent and constitution, on the other hand, is not aimed at detecting chromosomal abnormalities but at analyzing an individual's phenotypic tendencies based on SNPs. NIPT is positioned as a "screening test for disease risk," while talent and constitution testing is positioned as "predictive information on phenotypic tendencies"—the two are, in essence, fundamentally different categories of testing. (5)(6)

As shown above, since the two tests serve different purposes, they are complementary. By confirming the baby's health with NIPT and learning about individuality tendencies with a talent/constitution test, you can gain a multifaceted picture of your baby. Indeed, more and more families are choosing to take both tests at the same time. Confirming a negative (low-risk) NIPT result before positively using the talent/constitution test results also greatly contributes to psychological stability during pregnancy. Note that NIPT is strictly a screening test (a probabilistic test) and not a definitive diagnosis. If NIPT comes back positive, additional confirmation through a definitive test such as amniocentesis is recommended. (1)(3)

Basic Knowledge of SNPs (Single Nucleotide Polymorphisms) and GWAS

To properly understand genetic testing for talent and constitution, basic knowledge of SNPs (Single Nucleotide Polymorphisms) and GWAS (Genome-Wide Association Study) is helpful. An SNP is a site where individuals differ by a single base among the roughly 3 billion base pairs of the human genome. There are several million or more SNPs across the entire human genome, and these subtle differences are one factor that produces the diverse phenotypic variation among individuals in appearance, constitution, and talent.

GWAS is an analytical method that comprehensively examines the statistical association between SNPs across the entire genome and specific traits (such as height, BMI, or IQ) in large populations (tens of thousands to hundreds of thousands of people). Through this method, dozens to thousands of SNPs associated with a given trait are identified, and the small effect size that each SNP contributes to the trait is aggregated to calculate a Polygenic Score (PGS). (4)

• Characteristics of SNPs: The effect of any single SNP on a phenotype is very small, but when many SNPs act together, a meaningful overall tendency emerges.
• Reliability of GWAS: The larger the sample size used in the analysis, the greater the statistical power and the lower the risk of false positives. In recent years, GWAS studies involving a million or more participants have been conducted.
• Polygenic score: A predictive score that integrates the effects of many SNPs, allowing an individual's genetic tendency to be expressed numerically. However, predictive accuracy varies by trait, and traits with higher heritability, such as height, tend to have stronger predictive power.

Fetal talent and constitution testing uses a system that references a database built on this massive body of GWAS research findings and calculates a polygenic score from the fetus's SNP data. It is therefore important to understand that the reliability of test results heavily depends on the quality and sample size of the underlying GWAS research.

The Relationship Between Genetics and Environment: How to Use Your Test Results

The information obtained from a genetic test is strictly a "genetic tendency value" and does not determine a baby's future with 100% certainty. Human traits are formed through the complex interaction of genetic factors (differences in DNA sequence) and environmental factors (nutrition, education, lifestyle habits, social environment, etc.). Behavioral genetics research indicates that the genetic contribution to intelligence is approximately 50 to 80%, and to height approximately 80%, while the heritability of personality traits is reported at around 40 to 60%. (4)

This means that while genetic tendencies certainly exist, there is considerable room to develop talents or reduce risks depending on how the environment is shaped. For example, many epidemiological studies have shown that even individuals with a genotype associated with a tendency toward weight gain can prevent obesity by adopting appropriate dietary management and exercise habits from an early stage. Similarly, even if SNPs associated with musical talent show a strong tendency, that talent is unlikely to develop without opportunities to engage with instruments or a musical environment.

An Epigenetics Perspective

Recent research into "epigenetics," which has been attracting attention, has revealed a mechanism by which gene expression is regulated through chemical modifications such as DNA methylation and histone modification, even without any change to the base sequence of the gene itself. This means that even individuals with the same genotype can show different phenotypes depending on the mother's nutritional state and stress level during pregnancy, or the child's rearing environment after birth, as these factors change whether a gene's "switch" is turned on or off. (2)

Therefore, it is important to view the results of this test as a "map of your child's possibilities" and to use them as a compass for parenting that respects the baby's individuality, rather than as a source of excessive expectation or fixed conclusions. Even if a genetic tendency toward "high athletic ability" appears, the child may end up being drawn to the arts instead; likewise, a child with a tendency toward "high mathematical ability" might become passionate about languages. The test results indicate a range of possibilities, and it is ideal to use them as a tool for expanding those possibilities while respecting the child's own autonomy. If you have any anxiety or questions about the test results, we recommend consulting a genetic counselor or a specialized medical professional.

Step-by-Step Guide to Taking the Test

Through a testing provider such as the seeDNA Institute of Genetic Medicine, blood collection and testing can be carried out safely and conveniently at partner medical institutions nationwide. The process from application to receiving your results is as follows. (1)

1. Application and counseling
   Book your test through the testing provider's official website or similar channels. It is recommended that you receive counseling in advance, either online or by phone, to get a thorough explanation of the test's content and what it can and cannot reveal. During counseling, you can also receive an explanation of the test's limitations (the difference between a genetic tendency and a definitive diagnosis), the possibility of not obtaining results (such as when the fetal fraction is insufficient), and ethical considerations.
2. Blood collection
   Maternal blood is collected at over 300 partner medical institutions across all 47 prefectures of Japan. The method is the same as an ordinary blood test, and the amount of blood drawn is small (approximately 10 to 20 mL), so there is almost no burden on the body. Blood is drawn from a vein in the arm, and the procedure takes only a few minutes. No particular rest is required afterward, so it causes almost no disruption to daily life.
3. DNA analysis
   The collected blood is sent to the testing institution's laboratory, where the latest microarray analysis or NGS technology is used to read the fetal DNA's SNPs with high precision. The lab proceeds with analysis under a strict quality control system, statistically distinguishing maternal-derived DNA from fetal-derived DNA to build a profile of the fetus's SNPs.
4. Result report
   Once the analysis is complete, a results report on genetic tendencies related to talent and constitution is delivered to you. If you have any questions about the results, you can also consult with specialized staff. The report includes scores and tendency graphs for each item, presented in a visually easy-to-understand format.

The Importance of Genetic Counseling

Because genetic test results contain specialized content, many people feel anxious about interpreting them. In genetic counseling, a certified genetic counselor or a clinical genetics specialist carefully explains the meaning of the test results and provides support that addresses the family's concerns. Related academic societies, including the Japan Society of Human Genetics, recommend providing an opportunity for counseling when undergoing genetic testing. In particular, a dialogue with a specialist is extremely valuable for correctly understanding the difference between a "genetic tendency" and a "definitive fate," and for receiving the results not with excessive worry or excitement, but as positive information to help maximize your baby's potential. The seeDNA Institute of Genetic Medicine offers free counseling both before and after testing, so even first-time users can approach the test with peace of mind. (5)

\ Find out your unborn baby's talents and constitution during pregnancy! /

Frequently Asked Questions

Q1. Are talent and constitution 100% determined by genetics?

A. No. Many constitutional traits and characteristics are influenced by genetic factors (DNA), but environmental factors (diet, education, exercise habits, etc.) also play a major role. Behavioral genetics research suggests that the genetic contribution to intelligence is approximately 50 to 80%. The test results only indicate a "genetic tendency" and are not a definitive prediction of the future. (4)

Q2. Where should I go to get tested?

A. If you use the services of the seeDNA Institute of Genetic Medicine, blood collection is available at over 300 partner medical institutions across all 47 prefectures of Japan. No matter where you live, you can easily undergo the test at your nearest partner facility. (1)

Q3. Can this be taken together with NIPT (new-generation prenatal diagnosis)?

A. Yes, it is possible. Since NIPT, which examines disease risk, and the genetic test for talent and constitution serve different purposes, undergoing both allows you to gain a more multifaceted understanding of your baby's health status and individual tendencies. (6)

Q4. How long does it take to receive the test results?

A. This varies by testing institution, but generally results are delivered approximately 2 to 3 weeks after the blood sample is taken. At the seeDNA Institute of Genetic Medicine, you can also consult specialized staff with any questions about your results. (1)

Q5. Is there any risk to the mother or baby?

A. This test is a non-invasive test completed with only a maternal blood draw. Since no procedure that inserts a needle into the uterus, such as amniocentesis or chorionic villus sampling, is performed, there is no concern about an increased risk of miscarriage, making it a highly safe testing method for both mother and baby. (3)

Q6. Can the test also reveal the risk of genetic diseases?

A. The genetic test for talent and constitution is designed to examine an individual's phenotypic tendencies (talent, constitution, sex, etc.) and is not a test for diagnosing chromosomal abnormalities or genetic disease risk. To detect disease risk, a separate specialized test such as NIPT is required. (6)

Q7. Can the test be taken even in the case of twins (a twin pregnancy)?

A. The test itself is possible even in a twin pregnancy, but because the cffDNA in maternal blood contains a mixture from both fetuses, the accuracy of determining results for each individual fetus may be affected. In the case of a twin pregnancy, we recommend thoroughly confirming the accuracy and limitations of the test during pre-test counseling.

Q8. How can I make use of the test results for my child's future education?

A. The genetic tendencies obtained from the test results are only one piece of reference information. Based on the results, it is recommended to consciously create an environment that nurtures your child's areas of strength, or to consider building dietary and exercise habits based on constitutional tendencies. However, it is most important not to become fixated on the results and to remain flexible in responding to your child's interests and developmental changes.

[References]

(1) seeDNA Genetic Testing & DNA Paternity Testing, January 2024
(2) Ministry of Health, Labour and Welfare, "Report of the Expert Panel on Prenatal Testing Including NIPT," February 1999
(3) J Biol Chem, March 1997
(4) Trends Microbiol, December 2011
(5) PR TIMES, March 2026
(6) Nat Genet, September 2018