Identity and family ties are essential pillars of our society, but sometimes questions arise that require concrete and verifiable answers. When suspicions about parentage put rights and responsibilities at stake, science offers a reliable solution: DNA paternity testing is the key to clarifying and formalising these relationships. However, undergoing a kinship test is not just a scientific or personal matter. It also involves a series of legal considerations that are essential to know. That is why at Ambar Lab, where we perform more than 3,000 laboratory tests, we tell you everything you need to know about DNA paternity testing. We answer the most frequently asked questions and explain the process clearly. Let’s get started!
What is required to conduct a DNA paternity test?
To perform a legally valid DNA paternity test, it is not simply a matter of obtaining a scientific result: a rigorous protocol is required to ensure that the result is legally valid.
First, sampling must be carried out in a controlled environment by qualified healthcare personnel or, if requested by a court, by professionals appointed by the judicial authority. Home testing is not permitted if official recognition is sought.
In addition, participants must be correctly identified. Adults are required to present a valid national identity card or passport, and minors must present a recent photograph and documents proving parental authority or guardianship, such as a family record book or legal authorisation.
One of the most important elements is the chain of custody: from obtaining the samples to delivering the final report, all steps must be documented and controlled to ensure that there is no tampering.
With regard to consent, if the child is a minor, the person exercising parental authority must sign the authorisation. If the child is over 18 years of age, they may request it themselves. If the test is ordered by the court, the consent of the alleged father is not required: the judge has the authority to compel him to undergo the test.
Finally, the most common samples are saliva samples, collected with a buccal swab, but fingernails, hair or blood can also be used, especially in situations where the standard sample cannot be collected.
How do I know if I am the father of a child without DNA?
It is extremely difficult to know with absolute certainty whether you are the father of a child without a genetic test. Although there are indications that can provide guidance, none of them can replace molecular analysis.
In some cases, physical similarities can be observed between the adult and the minor: face shape, eye colour, height or gait. However, these similarities may also be due to genetic factors shared by other family members or even coincidence.
From a medical point of view, blood type can be used to rule out paternity. For example, if a mother with type O blood and a presumed father with type AB blood have a child with type O blood, basic analysis already indicates that he cannot be the father. But even this information is limited: blood type does not allow for certain confirmation of a biological relationship.
Studies of hereditary diseases and family medical histories have also been used, but these methods are only indicative and not conclusive. The only sure way to confirm or rule out parentage is through a DNA paternity test, as this allows direct comparison of genetic markers from the child and the alleged father, with a reliability of over 99.99%.
Is it possible to conduct a paternity test without the father’s consent?
As mentioned above, consent is an essential requirement for conducting a legally valid DNA test. In Spain, this principle is regulated by the Data Protection Act and by the rules governing fundamental human rights.
However, there is one exception: when the process is being handled by the courts. In such cases, if the judge admits a paternity suit or paternity challenge, he or she may order the test to be carried out without the consent of the alleged father. To do so, the plaintiff must present solid evidence justifying the need for the analysis.
In the event of an unjustified refusal by the alleged father to undergo the ordered test, the courts may consider this fact as relevant evidence against him, which does not amount to a confession, but does influence the judicial assessment of the evidence.
In situations where there is no judicial intervention, any laboratory, including Ambar Lab, will always require the signature of informed consent from all adult participants and the legal representatives of any minors involved.
What happens if the result is positive or negative?
A positive result indicates that there is a genetic match between the alleged father and the child, confirming paternity. The information can be used for voluntary recognition, by signing a document before a notary or by requesting registration in the Civil Registry.
If, on the other hand, the result is negative, it may serve as grounds for challenging an existing filiation, whether through marriage or voluntary recognition. The effects of this result affect sensitive issues such as:
- Modification of the birth certificate in the Civil Registry
- Custody rights and access arrangements
- Maintenance obligations
- Inheritance rights
In all cases, both a positive and a negative result have legal consequences that can transform the family situation. Therefore, it is essential to have a specialised laboratory that guarantees both the accuracy of the analysis and the legal validity of the process.
Where and how can I get a legal paternity test?
At Ambar Lab, we offer legally valid DNA paternity testing services. The process is simple, transparent, and tailored to each situation.
First, you must request an appointment or consultation through our website or by calling our contact number. From there, sample collection will be coordinated at one of our authorised centres, complying with all identification and documentation requirements.
Once the samples have been collected, genetic analysis begins at our accredited facilities. The chain of custody is maintained at all times and each stage is documented. The results are delivered within 7 to 10 days, accompanied by a detailed report that is legally valid.
Our team of experts is available to answer any questions before, during, or after the process.
Frequently asked questions about DNA paternity testing
Can a test be done if the alleged father has died?
Sí, es posible. Cuando el presunto padre ha fallecido, el procedimiento se lleva a cabo generalmente mediante una orden judicial en el marco de un proceso de reclamación de filiación. Existen varias vías para obtener el material genético:
- Analyse previously preserved biological samples (blood, tissues, body fluids).
- Exhume the body if no previous samples exist, in order to obtain DNA from bones or teeth.
- Conduct kinship tests with immediate family members of the deceased, such as siblings, parents, or legally recognised children.
Is it possible to challenge paternity that has already been recognised?
Yes. Spanish law provides for the possibility of challenging an established parentage, whether it is a marital or extramarital parentage. But who can challenge it?
- The father who signed the acknowledgement.
- The child when he or she reaches the age of majority.
- The mother or her legal representative.
- In some cases, heirs or persons with a legitimate interest.
What happens if the alleged father refuses to take the test?
It depends on whether or not the refusal is justified:
- If justified on medical grounds, lack of relationship or identification errors, there are no legal repercussions.
- If it is not justified, the courts may interpret the refusal as indirect evidence of paternity, provided that there is other additional evidence. Although it is not considered a tacit confession, it can have a decisive influence on the judgement.
Professionalism, discretion and experience
Performing a DNA paternity test is a decisive step that can have lasting legal consequences. That is why it is crucial to have a trusted laboratory such as Ambar Lab, which, in addition to offering cutting-edge technology and scientific precision, provides the support of an expert team that accompanies you through every stage of the process.
If you have any questions or require further information, please contact us and request a personalised consultation. We are here to help you resolve any situation involving a paternity DNA test with complete professionalism and discretion.
