A paternity test while you're pregnant at Quick Test in Tucson confirms your baby's biological father before birth.
A non-invasive blood draw from the mother and a cheek swab from the possible father, with no risk to the pregnancy.
HOW IT WORKS
WALK-IN
15-Minute Visit
Results 3-5 days
How a paternity test during pregnancy works
A paternity test during pregnancy determines a baby's biological father from a single blood sample, with no risk to the pregnancy. By the tenth week, the baby's DNA is present in the mother's bloodstream in a concentration high enough to be isolated and analyzed. Quick Test collects a blood draw from the mother and a cheek swab from the possible father.
Samples are tested at an AABB-accredited reference laboratory that separates the fetal DNA, builds a profile, and compares it against the father's, confirming or excluding paternity with 99.9 percent accuracy.
Nothing is collected from the baby; the test is entirely non-invasive.
Collection at our Tucson laboratory
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Both samples are collected in one visit at our office on St. Mary's Road. The mother's blood draw and the possible father's cheek swab take only a few minutes, and Quick Test manages the collection, documentation, and transport to the laboratory. Walk-in collection is available Monday through Friday, with same-day appointments for families who prefer to schedule. If the possible father is located elsewhere, his sample can be collected at an accredited facility and submitted to the same laboratory. Quick Test serves Tucson, Marana, Oro Valley, Catalina Foothills, Sahuarita, and Vail.
Why Testing Begins at Ten Weeks
At Quick Test, prenatal collection begins at the tenth week of pregnancy and never earlier.
That timing is a deliberate quality decision, not a delay.
The result depends on fetal fraction: The share of your baby's DNA circulating in your plasma — known clinically as the fetal fraction — rises steadily as the pregnancy matures. The laboratory needs that concentration to reach a dependable level before it can build a clean profile and return a definitive answer.
Testing too soon invites a rejected sample: Earlier than ten weeks, the amount of fetal DNA in your blood is frequently too low or too unstable to read. A sample drawn prematurely is far more likely to be rejected for insufficient fraction, which means no answer, a longer wait, and a second blood draw weeks later.
Ten weeks is when the data becomes reliable: By this point, your baby's DNA holds a strong, steady share of the genetic material in your plasma and stays there through the months ahead. Collecting at ten weeks gives the laboratory dependable material to work with on the very first attempt.
It protects your results and your investment: A prenatal paternity test is far too important to gamble on a rushed timeline. Waiting for the ten-week milestone means one short, unhurried visit and a definitive, 99.9 percent accurate result.
This approach avoids the cost and anxiety of an unnecessary re-test.
Prenatal Paternity Test FAQ
Is a prenatal paternity test safe for my baby? Yes. The test is non-invasive — it requires only a blood draw from the mother and a cheek swab from the possible father, and nothing is collected from the baby or the pregnancy itself. It carries none of the risk associated with invasive procedures.
Can the baby's gender be included in the results? Yes. Because the analysis already reads your baby's DNA, fetal sex can be included on the same report at your request, from the same collection.
Can more than one possible father be tested? Yes. Each additional possible father can be tested for an added fee. The single limitation is that closely related men — brothers, or a father and son — share too much DNA to be told apart reliably.
Phone: (520) 386-7677
Address: 1310 W St Marys Rd, 2nd Floor, Tucson AZ 85745
Hours: Mon–Fri 7 AM–4 PM | Sat by appointment only
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Quest Passcode Drug Testing Hours
Tucson, AZ: Monday-Friday: 7 am-2 pm
Closed 12 pm-12:30 pm for lunch daily
Saturday- By appointment only
Walk-ins only