Paternity testing conclusively determines biological father-child relationships with over 99.9% accuracy when the alleged father is the biological parent, or 100% exclusion when he is not. Testing analyzes genetic markers from the child, alleged father, and optionally the mother to establish biological relationship. This is the most commonly requested DNA test for legal matters, personal confirmation, and establishing parental rights and responsibilities.

Maternity testing confirms the biological mother-child relationship through DNA comparison. While less common than paternity testing, maternity tests are essential in cases involving hospital mix-ups, adoption verification, surrogacy arrangements, immigration cases requiring proof of maternal relationship, and resolving family lineage questions.

When the alleged father is unavailable for testing, grandparentage analysis can determine biological relationships through the paternal grandparents. This test compares the child's DNA with one or both grandparents to establish whether they share a biological connection through their son. Grandparentage testing is particularly valuable in immigration cases, inheritance disputes, and situations where the alleged father is deceased or unwilling to participate.

Sibling testing determines whether two or more individuals share one or both biological parents. Full sibling tests identify if individuals share the same mother and father, while half-sibling tests determine if they share only one biological parent. This testing is useful for adoption reunions, inheritance claims, immigration family reunification cases, and personal family history confirmation.

Avuncular testing establishes biological relationships between a child and an alleged aunt or uncle when the parent is unavailable for direct testing. This test analyzes whether the aunt or uncle shares a biological connection with the child through their sibling (the alleged parent). Commonly used in immigration cases and family reunification matters when direct parent testing is not possible.

Twin zygosity testing determines whether twins are identical (monozygotic) or fraternal (dizygotic) through DNA comparison. Identical twins share 100% of their DNA, while fraternal twins share approximately 50% like any other siblings. This testing satisfies medical necessity, personal curiosity, and can be important for organ donation compatibility or understanding genetic health risks.

Y-chromosome testing traces paternal lineage through the direct male line, as the Y-chromosome passes virtually unchanged from father to son. Mitochondrial DNA testing traces maternal lineage through the direct female line, inherited from mother to all children. These specialized tests establish biological relationships through specific ancestral lines and are valuable when traditional relationship testing is not conclusive.

DNA profiling creates a unique genetic record for personal identification purposes. This service is valuable for creating a genetic record for children's safety, maintaining genetic information for medical purposes, establishing baseline DNA profiles for military personnel or high-risk occupations, and preserving genetic identification for future needs.