At the time, Rowlette did not know who Dr. Mortimer was, and did not know her parents had used help with conception.
The results showed Rowlette's biological father was not the man she'd always known, but a stranger named Gerald Mortimer - a man she later found out had been her parents' fertility doctor and had impregnated her mother with his own sperm without her mother's knowledge or consent.
The truth remained hidden until July 2017, when Rowlette received a notification from Ancestry.com that a DNA sample she had submitted matched with Dr. Mortimer's DNA sample, and predicted their parent-child relationship.
If you don't believe me, wait until you hear about Gerald Mortimer, a retired Idaho Falls obstetrician and gynecologist who was just sued by the woman who allegedly discovered he's her biological father.
"Dr. Mortimer knew that Kelli Rowlette was his biological daughter, but he did not say that to either Ashby or Fowler", according to the papers.
The family is suing Mortimer and Obstetrics and Gynecology Associates of Idaho Falls, accusing them of medical negligence, fraud, battery, negligent infliction of emotional distress and breach of contract.
Ms Rowlette said she took a DNA test in July through Ancestry.com, which identified Dr Mortimer as her parent.
The lawsuit also states Mortimer "cried" when the mother informed him they were moving from Idaho to Washington state.
To increase chances of fertility, the couple agreed to mix the husband's sperm with other matching donors, noting they preferred college students more than 180cm tall.
"Dr. Mortimer represented that 85 [percent] of the mixture would be Mr. Fowler's genetic material, while 15 [percent] would be genetic material from an anonymous donor of characteristics selected by Ms. Ashby and Mr. Fowler".
Ms Roulette was conceived via artificial insemination in the 1980s.
After news of the lawsuit, a spokeswoman for Ancestry.com said in a statement Tuesday that DNA testing "helps people make new and powerful discoveries about their family history and identity".
The Ancestry.com DNA test provides customers with likely genetic matches for those interested in genealogy.
Metro.co.uk has attempted to contact Kelli Rowlette and Dr Mortimer for comment.
In 1980, Ashby discovered that she was pregnant, and nine months later, Rowlette was born.
According to her complaint, the 36-year-old did not know that her divorced parents had a fertility problem until she spoke to them open after the results of the DNA test. Rowlette's mother continued to see Mortimer for reproductive care.
"However with this, people may learn of unexpected connections". She told her mother, expressing her "disappointment in the unreliability of the service" - and her mother recognized the doctor's name, according to the lawsuit.