single ascertainment

sin·gle as·cer·tain·ment

method of ascertainment of locating affected people by hospital or clinic admission or another way in which probability of encountering the same family twice approaches 0; thus, the probability that a family will be ascertained is proportional to the number of affected members.
References in periodicals archive ?
Two extreme ascertainment methods are complete ascertainment and single ascertainment. In complete ascertainment, all families in a defined population with at least one case are included; meanwhile, in single ascertainment, the families are included with probability proportional to the number of affected members.
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