The hair sample is preserved for possible future use, though it currently offers no identification leads.
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The only biological evidence under analysis is a mixed DNA sample containing material from up to four individuals.
This sample was initially sent to a private lab and later to the FBI for advanced testing.
Additional laboratories across several states are working to interpret the mixed DNA results, which could be critical to identifying a suspect.
On February 10, the FBI released doorbell camera footage showing a masked, armed individual outside Guthrie's home on the morning she disappeared.
The person is described as a male, average build, approximately 5-foot-9 to 5-foot-10, carrying a black backpack.
The video shows the individual blocking the camera and covering it with plants before the footage stops.
Authorities believe this person took deliberate steps to prepare for the event that night.
Investigators also found a damaged utility box near the home that may have caused an internet outage disabling local surveillance cameras around the time of the disappearance.
Savannah Guthrie, Nancy's daughter and a television co-host, posted a video on July 27 pleading with the kidnapper to provide information.
"We are in agony. We are in a nightmare that will not end.
Nothing about our situation has changed," she said.
"So I'm asking you, begging you, to do the right thing now, make the right choice. Help us find her.
Tell us where to look for her. I truly believe it is never too late to do the right thing."
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A combined reward of $1.2 million is offered for information leading to Nancy Guthrie's recovery. Tip lines remain open for anyone with relevant information.
