How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sarahfnp-bc Your Own Question
sarahfnp-bc, Family Nurse Practitioner
Category: Health
Satisfied Customers: 408
Experience:  OB, L&D, ER, and family practice, addictions treatment and detox with methadone and suboxone.
Type Your Health Question Here...
sarahfnp-bc is online now
A new question is answered every 9 seconds

Up to how many hours after intercourse can a DNA test be ...

Resolved Question:

Up to how many hours after intercourse can a DNA test be completed to prove it had taken place?
Submitted: 9 years ago.
Category: Health
Expert:  sarahfnp-bc replied 9 years ago.

Thanks for the question. I need to follow up with some questions of my own so I fully understand what you are asking.

You are trying to prove that the actual act of penile/vaginal penetration has taken place?

Are you trying to gather DNA evidence from a male or female?

Do you know if the male ejaculated into the female vagina or someplace else?

Let me know so I can try to help.

Customer: replied 9 years ago.
Yes proof of penetration.
Evidendce from a female.
Ejaculation has taken place.

Thank you.
Expert:  sarahfnp-bc replied 9 years ago.
It's a tricky question as there are a lot of variables. Has the woman taken a shower, douched, or bathed?

Typically when gathering evidence we like to get within 72 hours post intercourse. We don't want the woman to bath, douche, shower, or wash anything. We also want the clothes including panties unwashed because those can also be tested.

Sperm has been collected from the cervix up to 6 days after sex but that is rare and the sperm is usually not whole.

So generally speaking 3 days. The closer to the actual time of sex that evidence is collected the better. But again there are tons of variables including the acidity of the woman's vagina.

I'm sending you a link that has a lot of great information on collection of evidence, time intervals, and variables.

Let me know if you have any other questions.

sarahfnp-bc and other Health Specialists are ready to help you