- Can the King-Devick Test in association with Mayo Clinic (K-D Test) be used without a baseline?
- Every student/athlete needs to have a K-D Test baseline in order to complete a K-D Test post-suspected head injury assessment. Baseline assessments take approximately 2 minutes to administer.
- Is there normative data for the K-D Test?
- The K-D Test does not use normative data for concussion evaluation. The student/athlete is always compared to his/her personal baseline.
- How often do I need to re-check the subject’s baseline?
- Subjects over 10 years old need their baselines re-established annually. Subjects 10 years and younger should re-check their baselines every six months. The K-D Test software requires annual or semi-annual re-administering and rerecording of a subjects' baseline K-D Test performance.
- Why do I have to do two tests in determining a K-D Test baseline?
- There is a learning curve associated with the K-D Test. On average, there is an improvement in K-D Test times after multiple attempts for non-concussed subjects. The subject’s baseline will be the faster of the two attempts. The baseline time should be the subject’s personal best with no errors. Any K-D Test completed with no errors and is faster than the established baseline becomes the subject’s new baseline time.
- What is the average completion time of the 3 test cards for subjects over 14 years old?
- On average, subjects 14 and older complete the whole test in less than 60 seconds. However, it may take longer than 60 seconds for subjects that have reading disabilities, etc.
- What if the subject is under 10 years old and cannot complete the 3 test cards for baseline testing without errors?
- In order to ensure the highest sensitivity possible, it is recommended that subjects complete as many test cards as possible error-free for baseline testing. If a subject is less than 10 years old and makes 5+ uncorrected errors in his/her first baseline attempt, eliminate test card #3, and re-test using the cumulative error-free time of the first 2 test cards for the baseline. The number of test cards used in baseline testing must be indicated on the score sheet for post-injury testing.
Post-Suspected Head Injury Testing
Vision is a big part of how brain function is measured. The eyes are actually part of the brain; therefore, the visual pathways give a widespread overview of what’s happening with the brain during concussion. Impaired eye movements can be apparent even when athletes appear to be asymptomatic or “fine” after a suspected head injury.
- When should the K-D Test be administered for concussion screening?
Administer the K-D Test any time a subject experiences a suspected head injury. An incident can occur during a sporting event, physical education or recess.
Also, the K-D Test can be administered to every athlete after every game. The K-D Test has been shown in published studies to detect un-witnessed or unreported concussions.
- Who can administer the K-D Test on the sidelines?
- Anyone trained on how to use the K-D Test can administer the test – coaches, athletic trainers, school nurses, team managers, or parents. You do not have to be a medical professional to administer the K-D Test.
- How long after a suspected head injury should the K-D Test be administered?
- The K-D Test can be administered immediately following and up to 36 hours after a suspected head injury.
- How does a subject fail K-D Test?
(Any of the below)
- Any worsening (increased) K-D Test time compared to the subject’s baseline
- Any uncorrected errors
- What happens if a subject performs faster than his/her baseline with no errors?
- If a subject performs faster than his/her baseline with no errors, that attempt will be the subject’s NEW baseline time. The fastest, error-free attempt of K-D Test will always be a subject’s baseline.
- What happens if the subject performs slower than his/her baseline or makes errors?
- The subject should be removed-from-play immediately and be referred to a licensed medical professional.
- Does exhaustion affect a subject’s ability to perform the K-D Test?
- Studies published in neurological journals, such as The Journal of Neurological Sciences, have proven the K-D Test to be robust to physical fatigue and exercise.