Aisyah, 25, has said previously that she was duped into the attack, but Malaysian police say she and the other female suspect, a Vietnamese woman who also is in custody, knew what they were doing.
They say they thought they were taking part in a TV prank.
The outcome of the medical examination is unknown.
A Malaysian policeman tries to stop members of the media as a North Korean embassy official leaves the Forensic department at the Hospital Kuala Lumpur in Kuala Lumpur, Malaysia, Feb. 15, 2017. Four of them stemmed from North Korea's foreign and security ministries, South Korean intelligence officials told its lawmakers according to the report.
Doan Thi Huong was arrested alongside an Indonesian woman, with both accused of carrying out a fatal poison attack on Kim Jong-Nam in Malaysia on February 13.
When asked whether Malaysian authorities thought Kim's death had been ordered by the North Korean government, he said "the four hold North Korean nationality, that is all".
In other notorious cases of hit teams assassinating enemies of a state overseas, a Bulgarian hit unit in 1978 stabbed Bulgarian writer Georgi Markov in the thigh with an umbrella as he waited for a bus on London's Waterloo Bridge, injecting a ricin pellet into him that caused his death in three days. According to Bloomberg, spies in South Korea "have a spotty record when reporting about high-level events in authoritarian, cloistered North Korea".
In grainy surveillance footage, the women appear to smear something onto Kim's face before walking away in separate directions.
UPS tests drone to deliver packages
Ohio-based electric truck and drone technology developer Workhorse Group is helping UPS in delivery technology using drones. In the future, those waiting on a package delivery in a rural area might have to keep an eye on the sky instead of the road.
Malaysian authorities have been criticized for failing to cordon off the airport terminal where Kim was exposed to the nerve agent.
The police are still looking into the source of the lethal nerve agent and why the two women, Vietnamese and Indonesian nationals who used their bare hands to rub some form of liquid on Kim's face, survived. But the North Korean despot may have seen his older brother as a potential rival, even though Jong-nam had lived in exile for years. But North Korea is not cooperating.
"She only said she was given an oily liquid, like baby oil" - VX is an amber-coloured liquid.
These then give way to convulsions, seizures, loss of consciousness and paralysis, and eventually death.
Malaysian police say the women washed their hands immediately after the attack as they'd been trained to do.
Also Saturday, police confirmed that a raid earlier in the week on a condominium on the outskirts of Kuala Lumpur was part of the investigation. Several other suspects are being sought, including an official who worked at North Korea's embassy.