Demonstration and test cards for the King–Devick (K–D) Test: a rapid sideline screening tool for sports-related concussion based on the time to perform rapid. Background The King-Devick (KD) test is an objective clinical test of eye movements that has been used to screen for concussion. A rapid, cost-effective, and reliable tool that facilitates diagnosis of concussion is needed. The King-Devick (K-D) test is a vision-based tool of rapid number.

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National Center for Biotechnology InformationU. Postfight K-D time scores were significantly higher worse for participants who had head trauma during the match Abstract Purpose Sports-related concussion has received increasing attention as a result of neurologic sequelae seen among athletes, highlighting the need for a validated, rapid screening tool. Concussion assessment and management.

MaguirePhD, L.

TennantEdD, C. The K-D test is an accurate and reliable method for identifying athletes with head trauma, and is a concussiion candidate rapid sideline screening test for concussion. Sensitivity and specificity of standardized neurocognitive testing immediately following sports concussion. Whiskers extending from the box plot represent the range of observations excluding outliers and the small circles beyond the whiskers represent symbolize outliers.

Acknowledgments The authors are grateful to the Wheaton College Sports Medicine staff for their support in study organization, implementation and testing of athletes.

Testing procedures for MMA fighters. Clin J Sport Med. N Engl J Med ; The number of errors made in reading the test cards is also recorded; misspeaks on numbers are recorded as cevick if the subject does not immediately correct the mistake before continuing on to the next number. The times required to complete each card are recorded in seconds using a stopwatch. The King—Devick test as a concussion screening tool administered by sports parents.

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New Research Questions Accuracy Of King Devick Test As Sideline Concussion Screening Tool

Chronic traumatic brain injury in professional soccer players. K—D change baseline vs. The King-Devick Test is a quick, accurate and objective concussion screening tool that can be administered on the sidelines by parents, devcik, athletic trainers, school nurses and medical professionals, and a Mayo Clinic knig indicated it detects concussions and possible ‘silent’ concussions.


We investigated the K-D test as a potential rapid sideline screening for concussion in a cohort of boxers and mixed martial arts fighters. Subjects were given standardized instructions for the K—D test. During the playing season, the K—D test and a modified version of the Sport Concussion Assessment Tool 2 SCAT2 were both utilized in the sideline assessment of athletes suspected of head trauma.

Demonstration and test cards for the King-Devick K-D Test, a candidate rapid sideline screening for concussion based on measurement of speed of rapid number naming To perform the K-D test, confussion are asked to read kihg numbers on each card from left to right as quickly as possible but without making any errors.

However, the SCAT2 does not objectively assess vision or eye movement function.

The King-Devick test as a determinant of head trauma and concussion in boxers and MMA fighters

Journal List J Optom v. Results of our study show that K-D test time scores have a high degree of test-retest reliability, with ICCs of 0.

SCAT2 results were recorded as a pass or fail based on the presence of any SCAT2 defects in which an athlete displayed any signs of symptoms of concussion i. The sum of the 3 test card time scores constitutes the summary score for the entire test, the K-D time score. Concussed athletes performed slower on their sideline K—D test compared to baseline with an average slowing from baseline of 4.

King—Devick test identifies symptomatic concussion in real-time and asymptomatic concussion over time. Ongoing large-scale longitudinal studies of collegiate concussino are examining the relation of K-D test scores and changes in scores over the course of a season with ImPACT and other formal cognitive testing.

Whiskers represent the range of observations minus outliers no outlier values in this sample. Open in a separate window. Test-retest reliability of the sport concussion assessment tool 2 SCAT2 for uninjured children and young adults.

It is recommended that future studies should continue to investigate the utility of the K—D test in concussion management and recovery to determine if there is correlation with clinical improvement.


After suspected head trauma, the athlete is given the test, which takes about two minutes, and the results are compared to a baseline test administered previously.

Concussion may result in a variety of symptoms and may go both unreported by athletes and undetected by trained observers. Closed head injury, even in mild form, is a leading cause of both short-term and long-term cognitive impairment among athletes, particularly for those in contact sports such as football, boxing, soccer, rugby, and hockey. To perform the K-D test, participants were asked to read the numbers on each card from left to right as quickly as possible but without making any errors.

Prev post Next post. Additionally, the effect of physical exercise on K—D scores in the absence of concussion was studied. Mayo Clinic has a financial interest in the technology described in this press release.

Post-workout data were obtained during a practice in the middle of the season for the men’s and women’s basketball teams immediately following a 2.

Eye movement tesg in multiple sclerosis. Now he does a post test and if revick has one error he is concussed, but his official baseline test says he has to do it with no errors. Investigating baseline neurocognitive performance between male and female athletes with a history of multiple concussion. Curr Sports Med Rep ; 8: This study provides additional evidence for the use of the K—D test as an effective, objective sideline assessment tool for concussion.

This article has been cited by other articles in PMC. Address correspondence and reprint requests to Dr. Moreover, MacDonald pointed to the difficulty even medical professionals have in obtaining accurate KD baselines, especially for athletes with pre-existing learning issues such as ADHD or dyslexia.