The study will enroll children and adolescents (0 - 17 years) suspected of having concussion or mild traumatic brain injury (TBI). Samples of urine and saliva will be collected from the patients as well as from corresponding age- and gender-adjusted healthy controls.

The collected samples will be alienated to the Sponsor who will perform biochemical studies to identify and measure from the samples relative level of the brain injury-specific biomarkers.

Inclusion Criteria:

• The subject is suspected of having an isolated mild TBI (Glasgow Coma Score 13 - 15)
• No more that 6 hours elapsed from the incident of injury at the first sampling
• The patient is conscious
• Informed consent received from the legal guardian, and the subject him-/herself when literate and capable of understanding study measures

Exclusion Criteria:

• More than 6 hours elapsed from the injury, or unknown time of trauma
• Multi-trauma patient
• History of head injury, seizures or stroke within three preceding months
• Chronic neurodegenerative, metabolic or autoimmune disease
• Known existing neurological condition

Individual participant data shall not be shared to outside of the study.

The laboratories will analyze the samples blinded, without knowing whether the sample was from an injured patient or a healthy control.