These are often contracted versions of the GCS itself (the Simplified Motor Score (SMS) uses the motor portion of the GCS only) and are less well studied than the GCS for outcomes like long-term mortality, and the GCS has been studied trended over time, while the SMS has not.
Simpler scores have been shown to perform as well as the GCS in the prehospital and emergency department setting (for initial evaluation). If individual institutions have concerns about agreement among providers, training and education are available from the GCS creators at. Reproducibility is usually good ( Reith 2016). A GCS of 8 should not be used in isolation to make a determination of whether to intubate a patient, but does suggest a level of obtundation that should be evaluated carefully. Correlation with outcome and severity is most accurate when applied to an individual patient over time the patient’s trend is important. The 3 parts of the Glasgow Coma Scale are charted independently, and the position can be recorded as NT (not testable), with an option of indicating the reason, e.g. In this circumstance, summation of the findings into a total Glasgow Coma Score is invalid. 
If a component is untestable, a score of 1 should not be assigned ( Teasdale 2014).
All (eye, verbal, motor): sedation, paralysis, and ventilation eliminating all responses. The reasons include, but are not limited to: In some patients, it may be impossible to assess one or more of the three components of the coma scale. ACLS, ATLS, APACHE I-III, TRISS and WNS SAH Grading Scale). 
The GCS has been incorporated into numerous guidelines and assessment scores (e.g. The GCS has been shown to have statistical correlation with a broad array of adverse neurologic outcomes, including brain injury, need for neurosurgery, and mortality. The GCS allows providers in multiple settings and with varied levels of training to communicate succinctly about a patient’s mental status.
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