There are a number of options. The most parsimonious is probably the method used in the NCS, which presents a list of traumatic events to the study subjects.
I previously used the IES-R to measure this construct in patients with whiplash associated disorders. However, before choosing one of the available questionnaires, I would probably check if there is evidence on the measurement properties in my target population. Particularly, I would check if there is good evidence regarding the content validity of one questionnaire (i.e. is the content of the instrument an adequate reflection of the construct to be measured in the target population?).
I agree with all the answers above; if you wish to use a "user friendly" clinician administered symptom severity rating scale, you might consider the Symptoms of Trauma Scale (SOTS); the is also a children's version (SOTS-C) authored by Julian Ford et al.
ACES (Felletti et al.) is an extremely important study! Shows that general health outcomes and mortality/morbidity are adversely effected by childhood trauma! Suggests, and I believe it to be true, that child abuse/neglect is arguably the #1 public health problem worldwide!
I recommend the test The Posttraumatic Stress Disorder Checklist (PCL), these are only 17 items, The Adverse Childhood ExperiencesStudy (ACE) http://at-ease.dva.gov.au/professionals/files/2012/12/PCL.pdf
Do you want to measure potentially traumatic events, or rather symptoms of post traumatic stress? It any rate, you might consider Edna Foa's Posttraumatic Diagnostic Scale PDS.
I see in the PDS that it has rating for the 3 criteria of PTSD; Re-experiencing, Avoidance, and Arousal. There is no normed score? I use the UCLA PTSD Index for DSM IV and it has a cutoff for diagnosing each criteria and then the total.
Sorry, I found the answer to my question: endorsement (rating of 1 or higher) of at least one re-experiencing symptom, three avoidance symptoms, and two arousal symptoms; duration of at least one month; and impairment in at least one area of functioning.