CAISS EXAM 2025 WITH ACTUAL QUESTIONS AND ANSWERS 100%
CORRECT
Question 1
The Abbreviated Injury Scale (AIS) was originally developed as a standardized system to
classify the type and severity of injuries resulting from what?
A) Industrial accidents
B) Military combat
C) Motor vehicle crashes (MVC)
D) Sporting events
E) Burns
Correct Answer: C) Motor vehicle crashes (MVC)
Rationale: The AIS was created in the late 1960s and early 1970s through a consensus
process involving medical professionals and automotive engineers, specifically to create a
uniform system for describing and ranking injuries from car accidents.
Question 2
How are the injury descriptors in the AIS dictionary organized?
A) By severity, from minor to critical.
B) Anatomically, by body region.
C) By the mechanism of injury (e.g., blunt vs. penetrating).
D) By the time of onset.
E) Chronologically, by the date the descriptor was added.
Correct Answer: B) Anatomically, by body region.
Rationale: The AIS dictionary is structured like an anatomy textbook. It is divided into
chapters based on body regions (e.g., Head, Face, Chest, Abdomen), and within each
chapter, injuries are organized by specific anatomic structures.
Question 3
The AIS severity score for a single injury is ranked relative to its threat to:
A) The specific body part.
B) The whole body.
C) The long-term outcome.
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D) The potential for cosmetic deformity.
E) The length of hospital stay.
Correct Answer: B) The whole body.
Rationale: AIS is a "threat-to-life" scale. The severity of an individual injury is ranked
based on its potential impact on the overall survival and physiological stability of the
patient, not just its local effect on the injured part.
Question 4
The severity of a single injury coded in AIS is unaffected by which of the following factors?
A) The patient's age.
B) The presence of pre-existing conditions.
C) The outcome or sequela of the injury.
D) The type of anatomic structure involved.
E) The specific level of the injury.
Correct Answer: C) The outcome or sequela of the injury.
Rationale: AIS is an anatomic scale that describes the severity of the injury itself at the time
it occurs. It is independent of the patient's individual response, the quality of care received,
or the long-term consequences (sequela) or outcome (e.g., death, disability).
Question 5
The AIS uses what type of measurement scale to rank injury severity?
A) A 10-point linear scale
B) A 6-point ordinal scale
C) A 100-point ratio scale
D) A 4-point nominal scale
E) A 15-point interval scale
Correct Answer: B) A 6-point ordinal scale
Rationale: The AIS severity is ranked on an ordinal scale from 1 (minor) to 6 (maximum).
"Ordinal" means that the codes have a rank order (a 3 is more severe than a 2), but the
intervals between the ranks are not equal (a 4 is not necessarily twice as severe as a 2).
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Question 6
Is mortality the sole determinant of an injury's AIS severity score?
A) Yes, any injury that results in death is an AIS 6.
B) No, mortality is not the sole determinant of severity.
C) Yes, only injuries with a high mortality rate are included in AIS.
D) No, mortality is not considered at all in the AIS system.
E) Yes, the AIS score is directly equal to the mortality percentage.
Correct Answer: B) No, mortality is not the sole determinant of severity.
Rationale: While threat-to-life (which includes mortality risk) is a key factor, it is not the
only one. A patient can die from complications of a relatively minor injury (e.g., an AIS 2),
and a patient can survive a very severe injury (e.g., an AIS 5). The score is based on the
injury itself, not the ultimate outcome.
Question 7
A patient dies following a trauma. Does this mean they are automatically assigned an injury with
the highest AIS severity code of 6?
A) Yes, all deaths are coded as AIS 6.
B) No, the injuries must be coded based on their own anatomic severity, regardless of the
outcome.
C) Yes, but only if the death occurs within 24 hours of the injury.
D) No, they are automatically assigned an AIS 9.
E) Yes, and the Injury Severity Score (ISS) will be 75.
Correct Answer: B) No, the injuries must be coded based on their own anatomic severity,
regardless of the outcome.
Rationale: A core principle of AIS is the separation of injury description from outcome. A
patient with several minor or moderate injuries could die from a complication, but those
injuries would still be coded with their respective low severity scores (e.g., AIS 1, 2, or 3).
Question 8
Does a linear relationship exist between AIS severity codes? For example, is an AIS 4 injury
twice as severe as an AIS 2 injury?
A) Yes, the scale is linear.
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B) No, a linear relationship does not exist because it is an ordinal scale.
C) Yes, but only for injuries to the head.
D) No, because an AIS 4 is four times as severe as an AIS 2.
E) Yes, this is the basis of the Injury Severity Score.
Correct Answer: B) No, a linear relationship does not exist because it is an ordinal scale.
Rationale: The AIS scale is ordinal, not interval or ratio. This means we know that a 4 is
more severe than a 2, but we cannot say by how much. The "distance" or difference in
severity between a 1 and a 2 is not the same as between a 4 and a 5.
Question 9
If the available medical documentation provides inadequate information to accurately code a
specific injury, what AIS severity code should be assigned?
A) 0
B) 1
C) 6
D) 9
E) X
Correct Answer: D) 9
Rationale: AIS 9 is the specific code used for injuries where the presence of an injury is
known, but there is not enough detail in the documentation to assign a more specific
descriptor and severity. It essentially means "injury of unknown severity."
Question 10
The single-digit AIS severity codes are based on the risk to what type of patient?
A) An elderly patient with multiple comorbidities.
B) A pediatric patient under the age of 10.
C) A young, healthy "average" patient with no pre-existing conditions.
D) A patient who has experienced a complication from treatment.
E) The most severely injured patient in the database.
Correct Answer: C) A young, healthy "average" patient with no pre-existing conditions.
Rationale: To standardize the severity ranking, the AIS assumes an "ideal" patient—
CORRECT
Question 1
The Abbreviated Injury Scale (AIS) was originally developed as a standardized system to
classify the type and severity of injuries resulting from what?
A) Industrial accidents
B) Military combat
C) Motor vehicle crashes (MVC)
D) Sporting events
E) Burns
Correct Answer: C) Motor vehicle crashes (MVC)
Rationale: The AIS was created in the late 1960s and early 1970s through a consensus
process involving medical professionals and automotive engineers, specifically to create a
uniform system for describing and ranking injuries from car accidents.
Question 2
How are the injury descriptors in the AIS dictionary organized?
A) By severity, from minor to critical.
B) Anatomically, by body region.
C) By the mechanism of injury (e.g., blunt vs. penetrating).
D) By the time of onset.
E) Chronologically, by the date the descriptor was added.
Correct Answer: B) Anatomically, by body region.
Rationale: The AIS dictionary is structured like an anatomy textbook. It is divided into
chapters based on body regions (e.g., Head, Face, Chest, Abdomen), and within each
chapter, injuries are organized by specific anatomic structures.
Question 3
The AIS severity score for a single injury is ranked relative to its threat to:
A) The specific body part.
B) The whole body.
C) The long-term outcome.
,[Type here]
D) The potential for cosmetic deformity.
E) The length of hospital stay.
Correct Answer: B) The whole body.
Rationale: AIS is a "threat-to-life" scale. The severity of an individual injury is ranked
based on its potential impact on the overall survival and physiological stability of the
patient, not just its local effect on the injured part.
Question 4
The severity of a single injury coded in AIS is unaffected by which of the following factors?
A) The patient's age.
B) The presence of pre-existing conditions.
C) The outcome or sequela of the injury.
D) The type of anatomic structure involved.
E) The specific level of the injury.
Correct Answer: C) The outcome or sequela of the injury.
Rationale: AIS is an anatomic scale that describes the severity of the injury itself at the time
it occurs. It is independent of the patient's individual response, the quality of care received,
or the long-term consequences (sequela) or outcome (e.g., death, disability).
Question 5
The AIS uses what type of measurement scale to rank injury severity?
A) A 10-point linear scale
B) A 6-point ordinal scale
C) A 100-point ratio scale
D) A 4-point nominal scale
E) A 15-point interval scale
Correct Answer: B) A 6-point ordinal scale
Rationale: The AIS severity is ranked on an ordinal scale from 1 (minor) to 6 (maximum).
"Ordinal" means that the codes have a rank order (a 3 is more severe than a 2), but the
intervals between the ranks are not equal (a 4 is not necessarily twice as severe as a 2).
,[Type here]
Question 6
Is mortality the sole determinant of an injury's AIS severity score?
A) Yes, any injury that results in death is an AIS 6.
B) No, mortality is not the sole determinant of severity.
C) Yes, only injuries with a high mortality rate are included in AIS.
D) No, mortality is not considered at all in the AIS system.
E) Yes, the AIS score is directly equal to the mortality percentage.
Correct Answer: B) No, mortality is not the sole determinant of severity.
Rationale: While threat-to-life (which includes mortality risk) is a key factor, it is not the
only one. A patient can die from complications of a relatively minor injury (e.g., an AIS 2),
and a patient can survive a very severe injury (e.g., an AIS 5). The score is based on the
injury itself, not the ultimate outcome.
Question 7
A patient dies following a trauma. Does this mean they are automatically assigned an injury with
the highest AIS severity code of 6?
A) Yes, all deaths are coded as AIS 6.
B) No, the injuries must be coded based on their own anatomic severity, regardless of the
outcome.
C) Yes, but only if the death occurs within 24 hours of the injury.
D) No, they are automatically assigned an AIS 9.
E) Yes, and the Injury Severity Score (ISS) will be 75.
Correct Answer: B) No, the injuries must be coded based on their own anatomic severity,
regardless of the outcome.
Rationale: A core principle of AIS is the separation of injury description from outcome. A
patient with several minor or moderate injuries could die from a complication, but those
injuries would still be coded with their respective low severity scores (e.g., AIS 1, 2, or 3).
Question 8
Does a linear relationship exist between AIS severity codes? For example, is an AIS 4 injury
twice as severe as an AIS 2 injury?
A) Yes, the scale is linear.
, [Type here]
B) No, a linear relationship does not exist because it is an ordinal scale.
C) Yes, but only for injuries to the head.
D) No, because an AIS 4 is four times as severe as an AIS 2.
E) Yes, this is the basis of the Injury Severity Score.
Correct Answer: B) No, a linear relationship does not exist because it is an ordinal scale.
Rationale: The AIS scale is ordinal, not interval or ratio. This means we know that a 4 is
more severe than a 2, but we cannot say by how much. The "distance" or difference in
severity between a 1 and a 2 is not the same as between a 4 and a 5.
Question 9
If the available medical documentation provides inadequate information to accurately code a
specific injury, what AIS severity code should be assigned?
A) 0
B) 1
C) 6
D) 9
E) X
Correct Answer: D) 9
Rationale: AIS 9 is the specific code used for injuries where the presence of an injury is
known, but there is not enough detail in the documentation to assign a more specific
descriptor and severity. It essentially means "injury of unknown severity."
Question 10
The single-digit AIS severity codes are based on the risk to what type of patient?
A) An elderly patient with multiple comorbidities.
B) A pediatric patient under the age of 10.
C) A young, healthy "average" patient with no pre-existing conditions.
D) A patient who has experienced a complication from treatment.
E) The most severely injured patient in the database.
Correct Answer: C) A young, healthy "average" patient with no pre-existing conditions.
Rationale: To standardize the severity ranking, the AIS assumes an "ideal" patient—
