Author Archives: jonptc

The alleged father is deceased or unavailable for testing. What are the options?


There are a few different avenues you can explore when an alleged father is deceased or missing.

If the alleged father passed away in the last few years, it is possible that the hospital, pathologist, or medical examiner has maintained a DNA sample. The most common types of sample maintained are blood cards and tubes of blood. If a sample has been maintained, the Next of Kin (usually the child, spouse or parent of deceased) must give permission for the facility to release the sample to our lab for DNA testing or a court order must be obtained. When a DNA sample for the alleged father is available then specimens from the mother and child are obtained and a paternity test can be performed. If a standard sample has been maintained for the alleged father (buccal swab, tube of blood, blood card) the price is the same as a standard paternity test.

If another type of sample exists (pathology slide, paraffin block with tissue, etc.), we can attempt to get a DNA profile from that specimen. In some rare cases, a body can be exhumed and a bone sample can be used. However, an unusual specimen fee would apply for any sample that is not a buccal swab, blood card, or tube of blood, and that cost depends on the type of sample to be tested. There is no guaranty that DNA will be obtained from a DNA profile from an unusual sample, and the specimen fee is nonrefundable in the event we are unsuccessful. The unusual specimen fee also does not include the cost of any paternity or relationship analysis. To discuss the price of an unusual specimen and to discuss the likelihood of getting a profile from that specimen, it is usually best to call and speak with one of our representatives.

If a sample has not been maintained on the alleged father, another option is a grandparent study. In a grandparent study, we need both of the alleged father’s biological parents, the child, and his/her mother. In a grandparent study with the child’s mother, we can still guaranty a 99.99% probability of paternity on a positive test, but on a grandparent study without the child’s mother we can only guaranty a 99% probability. This is because everyone gets half of their DNA from their biological mother and half from their biological father. When we have the child’s mother’s DNA, we eliminate what she gave to the child, and we only compare the other half of the DNA against the grandparents. This is also the reason both grandparents’ DNA is necessary. Between both biological grandparents, we have the alleged father’s DNA profile. If only one of the alleged father’s parents is tested, then only half of his profile is available, and a conclusive result cannot be guaranteed.

In the absence of an available sample for the alleged father and if both of his parents are unavailable, another possibility is a family reconstruction. This is where DNA profiles of surviving relatives of the alleged father are compared to the DNA profiles of the child. We prefer to have the child, the child’s mother (to eliminate what she gave to the child so we know exactly what the child inherited from his/her biological father), and three direct relatives of the alleged father (parent, full siblings, known children). We encourage at least 3 direct relatives, and it is the same price whether one direct relative or all 3 participate (with the exception for the specimen fees). The more surviving direct relatives of the alleged father that participate in the test, the better chance there is of obtaining a conclusive answer. The reason this type of test is a last resort is that it is expensive, it can take much longer, and we cannot guaranty a conclusive answer.

If the child is male and the alleged father has a full brother (who shares the same father), known son, or father who is still living, a Y chromosome study may be available. This only indicates whether or not the testing parties share the same male lineage. It does not indicate the relationships of the testing parties, and does not determine that the alleged father is the father of the child.

If the test does not need to be used for anything official and you are just trying to answer a personal question, you may be able to pursue a home test. This is where an artifact maintained from the alleged father (licked envelope, tooth brush, etc.) is used as his sample and buccal swabs are used for the child and mother. As stated above, any sample that is not a buccal swab, blood card, or tube of blood is subject to an unusual specimen fee, and this fee would apply for the artifact used for the alleged father’s specimen. Since we cannot verify the source of the artifact sample (i.e., we cannot prove whose DNA is on those samples), this test cannot be used for anything official and will not stand up in court.

A few times we have had customers ask if they can use a print-out of the alleged father’s DNA profile from a previous test to compare to the child. If there is a proper chain of custody and permission from the next of kin then it may be possible to use those results for a legal paternity test, but there is no way to be sure. If results don’t need to be used for anything official then using an old profile for comparison is usually possible. However, this route does pose a few limitations. Firstly, we only have the DNA loci on the print-out available for the alleged father’s profile. In other words, if we compare those locations to the profile of the child, and additional testing is needed to get a conclusive answer (either 4 mismatches on a negative test or a 99.99% probability on a positive test), we would not be able to complete the additional testing since all we have is a print-out of the alleged father’s profile instead of having the sample to run more DNA locations.

Also, on all negative tests, the AABB (the accrediting body for relationship testing laboratories) requires the samples to be run twice to rule out the possibility of a sample switch or contamination in the laboratory. We cannot verify that the sample was run a second time on the original test with the alleged father’s profile on it.


Why not just wait until the baby is born? It is more expensive to have the test now.

While it is several hundred dollars more to have the non-invasive prenatal test, the outcome of the test affects so many lives that it is usually money well spent.  Instead of two or three families holding their breath waiting to see what family a baby belongs to, the families can plan for the new arrival.  Paternity can be determined before the mother is even 3 months along.  There will be no need for the potential fathers to even inform their families until they know the results of the test. 

The stress that this eliminates for the mother, her family, the potential fathers and their families can be significant.  The stress of not knowing the answer can be physically harmful to everyone involved.  Many studies have shown that stress can even significantly impact the pregnancy. 

Everyone’s life may be put on hold until the results are known.  The alleged fathers may not know whether to continue school or find a higher paying job.  The mother may not want to pursue a relationship with one man when the other one may be the father.  Nine months can be a very long time when waiting to determine the paternity of a child.

The effects of the test spread beyond just the mother and the potential father.  Each of their families is anxious to know whether or not they will be welcoming a new baby.  The alleged fathers may be reluctant to even inform their families if they are not sure that the child is theirs.  Nothing like telling grandma she is getting a new grandbaby…maybe. 

There are many personal reasons for verifying paternity before the birth of the child.  The reason will vary from one case to another.  Regardless of the reasons that you want the paternity test, it is a very important decision.  Making sure that you have an accurate reliable test is the most important decision that you have to make when deciding to test. 

Always use an AABB accredited laboratory.  That is the only assurance that you have that the test is performed by a reliable and trustworthy laboratory.  DO NOT go online and choose a laboratory based on what the website says.  You may not even be using a laboratory.  By going to the American Association of Blood Banks (AABB) website you can be assured that, by choosing one of the laboratories listed, you will receive a legitimate test. 

PTC Laboratories has been an AABB accredited laboratory for more than 15 years.  Our non-invasive prenatal test is the only non-invasive test available that has publications in major medical journals.  If you have questions or need information about this test, please visit our website: or reach us by telephone at 888-837-8323.

Are paternity tests always right? What about non-invasive prenatal tests?

What if the test has the wrong answer?  Quotes from Directors of some paternity laboratories shed light on the very real possibility that a paternity test may have the wrong answer.  This is even more of a concern for a prenatal paternity test from the mother’s blood.

In regard to tests after the baby is born, these were quotes from two different laboratory directors.

“But it only happens in maybe a handful of cases a year. It’s not a very common occurrence.”


“It only applies to a few borderline cases,” he said. “We’re not sending a guy to the gas chamber. We’re saying he has to pay child support.”

These are rather flippant attitudes toward determining the paternity of a child.

What about when a prenatal test is incorrect………the consequence?  It may very well be the equivalent of sending the baby to the gas chamber.  Pregnancies may be terminated based on the results of the test.

When people are literally making life and death decisions based on the results of the test, it is absolutely imperative that the test be accurate and reliable.

There are no rules or regulations.  Paternity testing is not protected by the Clinical Laboratory Improvement Act (CLIA).  Although the American Association of Blood Banks (AABB) offers accreditation, the accreditation for paternity testing is voluntary.  There are no government regulations.  You heard that right.  Absolutely none!  Often unscrupulous laboratories lie about being accredited.  There is no one to stop them.  The internet has no scruples.  A pretty website and a few lies go a long way.  A few pictures of doctors in scrubs or lab coats, a few false credentials, and a convincing “trust us, we have been doing this for years” and you are onboard.

The only way to know that you are obtaining a legitimate test is to go to an AABB accredited laboratory that offers non-invasive prenatal testing.  Non-invasive prenatal tests are too new to be accredited, but accredited laboratories can be trusted to employ testing methods that will result in reliable testing.

Historically, and in some cases presently, prenatal paternity testing from the mother’s blood has been incredibly inaccurate and unreliable.  The below link describes a laboratory(ies) (same lab, different names) claiming it has been possible for more than 10 years.

In our experience their test had no more reliability than flipping a coin.  It was every bit as likely to be incorrect as it was to correctly predict paternity of a child.  The scientists performing these unreliable tests have operated under many company names for more than 10 years and continue to tout their experience and reliability.  It is hard to know how many lives have been changed or for that matter eliminated because of this unreliable test.  The companies have very convincing web sites.  Even though they are located in Canada they often have New York or California PO Box addresses.  They brag about the fact that they have been doing this for more than 10 years.  They don’t mention that their tests are extremely unreliable.  When too many people complain about one company, they simply change their name.

Any website that boasts they have been accurately performing prenatal paternity testing from the mother’s blood for 10 years can’t be trusted.  See, for example,

Non-invasive prenatal testing is a very new technology.

Now there are even online sites that claim to be able to perform a prenatal paternity test from a finger prick.

Scientifically, this is absurd.  There is barely enough fetal DNA in several tubes of the mother’s blood to perform a test, much less in a couple of drops from a finger prick.  But, if you are willing to buy it, then they are willing to sell it.  If it is just a guess, oh well.

If you or someone you know is going to have a non-invasive prenatal paternity test, make sure it is performed through a legitimate source.  If the laboratory is not on the AABB accredited laboratory list, it is not wise to trust them.  They may not even be a laboratory.

Is there a non-invasive prenatal paternity test that meets PTC’s high standards of quality and reliability?


There is a new baby coming.  The problem is that there are two possible fathers!  Until recently it was impossible to reliably determine paternity before birth without an invasive and risky procedure.

For several years it has been possible to have a paternity test from the mother’s blood, but the results were very often incorrect.  There was really no point in having the non-invasive test because it was so inaccurate that the chance of obtaining a correct answer was just about the same as the chance of receiving a wrong answer.

That has changed.  New technologies and methods for isolating the fetal DNA from the mother’s blood have made it possible to reliably determine paternity before birth without the risks and cost associated with invasive procedures such as amniocentesis and Chorionic Villus Sampling (CVS).

Paternity Testing Corporation has been the leader in reliability of DNA testing for more than 15 years.  The most important aspect of DNA paternity testing is ensuring the parents that the answer obtained is the correct answer.  In more than 15 years of paternity testing we have NO instances where the results of a PTC paternity test have later been shown to be incorrect.  As far as we know, each and every test that we have issued has the correct paternity determination.  PTC is the only large paternity laboratory that can make this statement.

Making sure that each and every paternity test is correct is not a matter of luck or coincidence.  Only being very careful, having protocols in place that are followed exactly for each case, and continually checking for consistency will result in correct answers each and every time.

Before PTC offered this new non-invasive prenatal paternity test we performed a great deal of research.  We knew that many of the non-invasive paternity tests previously offered were inaccurate.  We had seen several examples of inaccurate tests first hand.  Parents questioning the results of a non-invasive prenatal test came to us for help.  In 13 instances (far more than half of the cases we have seen) the results of the non-invasive tests were incorrect.  A non-invasive prenatal test is very difficult.  The test is only accurate if performed correctly and carefully each time.  In order to ensure accuracy of the test, the testing procedure must be repeated and produce identical results.  The statistical calculations must be sufficient to ensure an acceptable level of reliability.  Everything must be perfect each time.

Only one fetal DNA laboratory is capable of meeting the high standards of PTC.  This laboratory has been performing these tests on a very limited basis for 4 years.  Until recently, the lab only performed this testing for criminal cases.  Performing the tests accurately takes time, patience and a great deal of skill.  The testing is very labor intensive and requires analysts that are proficient in fetal DNA isolation techniques.  This laboratory focuses on non-invasive prenatal testing for genetic disorders and, until recently, could not commit sufficient staff and time to perform larger numbers of paternity tests.

PTC is now able to offer this test to the general public.  We are proud to announce that we are working in conjunction with our affiliate laboratory to bring this reliable non-invasive prenatal test to every family in need.

Knowing the answer before the baby is born is incredibly important to many families.  The family begins bonding to the baby long before birth.  Waiting until birth in order to determine the father of the child not only impacts the mother and her family but also changes the lives of the potential father(s) and their families.  Everyone is anxious and hesitant to move forward until the answer is known.

If you are in need of a non-invasive prenatal paternity test please contact PTC.  You may contact PTC by email or by phone: or 888-837-8323