A paternity test can be done as early as 7 to 9 weeks after conception during pregnancy using a non-invasive prenatal paternity test, which requires a blood sample from the mother and a mouth swab from the alleged father. This test is safe for both the mother and unborn baby but is generally for peace of mind and not legally binding. After birth, a paternity test can be performed immediately by collecting cheek swabs from the baby and the alleged father. Results for non-legal tests are often available within 1 to 3 days after samples reach the lab, and legal tests that require chain-of-custody sample collection may take longer depending on the arrangements.

Prenatal Paternity Testing

• Can be done as early as 7 weeks after conception (9 weeks after last period).
• Non-invasive; requires mother's blood and father's cheek swab.
• Safe for mother and fetus.
• Generally not for legal use but for peace of mind.
• Results typically available in a few days.

Post-Birth Paternity Testing

• Can be done immediately after birth.
• DNA sample collected via cheek swab from baby and potential father.
• Legal tests require sample collection under strict chain-of-custody.
• Results can be returned usually within 1-3 business days for non-legal tests; expedited options are available.

This allows paternity testing to be obtained very early if needed during pregnancy or as soon as the baby is born, with rapid turnaround times for results.