The private DNA test has no validity and could not use in evidence. IF you need to take a DNA test you have to file petition for that before the court.DNA test in a matter relating to paternity of a child should not be directed by the court as a matter of course or in a routine manner, whenever such a request is made. The court has to consider diverse aspects including presumption under Section 112 of the Evidence Act; pros and cons of such order and the test of “eminent need” whether it is not possible for the court to reach the truth without use of such test.
DNA testing is the most legitimate and scientifically perfect means, which the husband could use, to establish his assertion of infidelity. This should simultaneously be taken as the most authentic, rightful and correct means also with the wife, for her to rebut the assertions made by the husband, and to establish that she had not been unfaithful, adulterous or disloyal. If the wife is right, she shall be proved to be so. Section 112 of the Indian Evidence Act also creates a legal presumption that the birth of a child during marriage would be a “conclusive proof of legitimacy.”
Supreme Court judgment is meant to protect the honour of the child and its mother. In a matter where paternity of a child is in issue before the court, the use of DNA is an extremely delicate and sensitive aspect.
The presumption of legitimacy is a presumption of law. When a child is born out of wedlock, there is a presumption in favour of his legitimacy and the presumption largely depends on the presumed fact that the parties to a marriage have necessary access to each other when a divorce petition is filed.
The courts have always adopted a judicious approach after weighing the material on record by posing a question whether there exists sufficient material on record to dispel the presumption as to legitimacy at the behest of the person challenging the legitimacy warranting such direction or not and thereafter arrived at the positive finding as to the conducting and non conducting of the DNA tests on case to case basis.
Courts do not order DNA tests just because you think you are not the father of the child.
That is for two reasons:
(a)Woman's chastity should not be put to test just because the husband doubts her; and
(b) Child should not be bastardized unless there are strong irrefutable grounds.
Husbands will not be allowed by Courts to go on a fishing expedition seeking the Courts to be involved to satisfy their doubts. So in your case , you have to establish the need for DNA test and convince the ingredients of Section 13(1)(i) of the Hindu Marriage Act.