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how to determine paternity

A 18-year-old female asked:
Dr. Rashed Hasan
30 years experience Pediatrics
Paternity: With the current technology (2014) Ultrasound shows images of the fetus during pregnancy and by itself cannot be used to determine paternity
Dr. Raselette Hunt
13 years experience Family Medicine
Paternity: No. Only DNA test can prove paternity results
Dr. Phillip Goebel
15 years experience Emergency Medicine
No: Ultrasound will not determine paternity at any point. It can give you a range of days during which you were likely to have conceived. DNA testing woul ... Read More

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A 24-year-old female asked:
Dr. Martin Raff
55 years experience Infectious Disease
DNA: The only certain way to prove paternity is through dna testing.
Dr. Bryan Levey
26 years experience Pediatrics
Even if...: .... The encounters were the same day, you can always determine paternity with a paternity test later. Of bigger concern: multiple unprotected sexua ... Read More
A 42-year-old member asked:
Dr. Anatoly Belilovsky
34 years experience Pediatrics
There are some...: ...Impossible outcomes: for example, an ab father cannot have a type o child, and vice versa. If mother's type is known, more combinations become impo ... Read More
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Dr. Richard Pollard
29 years experience Anesthesiology
Rarely: There would have to be an impossible genetic match to rule out a child. For example a male (type ab) cannot be the father of a type o child. However, ... Read More
A 27-year-old female asked:
Dr. James Okamoto
28 years experience Family Medicine
Difficult to do: It is difficult to get conception dates accurate within only 5-6 days. Dates are usually accurate within 2 wks with good ultrasound and menstrual his ... Read More
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A 18-year-old female asked:
Dr. Jeffrey Juchau
32 years experience Family Medicine
Not by US: I think this is going to require genetic testing or blood work compatibility testing. The times are within the sensitivity of the ultrasound dating I ... Read More
A 28-year-old female asked:
Dr. Harold Mandel
39 years experience General Practice
Paternity testing: It's hard to say exactly & what if there are multiple sex partners. Most of the time, you will not know the exact day you got pregnant. Paternity ... Read More
A 26-year-old female asked:
Dr. Robert Killian
27 years experience General Practice
Early Pregnancy: The early pregnancy ultrasounds are used to get accurate dating of the pregnancy. This is where you can determine this answer.
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A 26-year-old female asked:
Dr. Yvette Westford
19 years experience Obstetrics and Gynecology
Yes: The margin of error in Ob ultrasound is 1 week in 1st trimester, 2 weeks in 2nd and 3 weeks in 3rd trimester. With an 8 week difference in coital timi ... Read More
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A 24-year-old female asked:
Dr. Paul Nowicki
23 years experience Gynecologic Oncology
I would say the : Father is the one who did not use the condom. As far as ultrasound they are too close together to use it as the determinant. Ultimately genetic testi ... Read More
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A 24-year-old female asked:
Dr. James Ferguson
45 years experience Pediatrics
Depends: The impact of the information often drives the need for a confirmatory study.If it was just for peace of mind, it would be considered unnecessary. If ... Read More

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