The eight have already recorded statements at Murang'a police station and investigations started by the local Criminal Investigations department.
DCIO Japheth Maingi has said the 8 will be charged in court once investigations into the case are concluded.
The suspects who include two medical students from Kenya Medical Training Institute, who are undertaking an internship at the hospital, two casual workers and four staffers are believed to have had access to the store where the kits had been stored.
According to Chief Officer of Health James Gitau, the county government discovered that the kits were missing after the Kirinyaga County government sought to be assisted with some kits after a delayed delivery in their county.
Gitau said in the hospital's store, only one carton of the kits was found yet there were no documents to explain their disappearance.
He expressed fears that the theft could be the doing of a cartel that has been previously blamed for a massive loss of drugs in the hospital as patients are referred to private pharmacies.
Gitau said the medics receive allowances from private pharmacies for referring patients to their facilities.
The cartel, he said, also frustrated plans by the county government to offer free medications to patients suffering from chronic illnesses.
"They would send people to get pricey drugs from the pharmacies for free then sell them to private pharmacies or in their private clinics," Gitau said.
Chronic illnesses’ patients have now been instructed to go for the drugs direct from the hospital.
A month ago, a clinical officer was interdicted after he confessed to deliberately prescribing asthma drugs to a patient who had a nose infection and referring him to a specific pharmacy.
Gitau then issued a memo to all medics instructing them to ensure they indicate their full names on prescriptions of patients who are referred to private pharmacies.
This followed an uproar by patients who complained of being directed to specific pharmacies for medications that were previously available at the hospital.