Biosafety is the development and implementation of administrative policies, work practices, facility design, and safety equipment.
Used to prevent transmission of biologic agents to workers, other persons, and the environment.
A fundamental objective of any biosafety program is the containment of potentially harmful biological agents.
Biosecurity is protection of high-consequence microbial agents and toxins, or critical relevant information, against theft or diversion by those who intend to pursue intentional misuse
Diagnostic testing which does not involve culture or isolation of viruses can be done in a BSL-2 Laboratory (as a minimum requirement). (WHO guideline)
The following practices are required in a BSL-2 lab setting for COVID-19 Laboratory:

Appropriate PPE is worn, including lab coats and gloves, eye protection and face shields should also be worn
Restricted access to the laboratory when work is being conducted
All procedures must be performed based on risk assessment and only by personnel with demonstrated capability, in strict observance of any relevant protocols at all times.
Initial processing (before inactivation) of specimens should take place in a validated biological safety cabinet (BSC) or primary containment device.
Propagative work (for example virus culture or neutralization assays) should be conducted in a containment laboratory with inward directional airflow (BSL-3).
Appropriate disinfectants with proven activity against enveloped viruses should be used
Procedures that cause infection from aerosols/splashes are done within a biological safety cabinet (BSC)