opt

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OPT

Abbreviation for:
ocular photodynamic therapy
opisthotonos
optic pathway tumour
optician
oral provocation test 
outpatient treatment

opt

To select one thing rather than another.
References in periodicals archive ?
Though he made attempts to encourage parents to support the uniform policy, Parker said the numbers opting out continued to rise, with 105 during the 2001-02 school year registration, 200 by the first week of school, to a list that now exceeds 450 students.
B) The only means of opting out as described in any notice subsequent to the initial notice is to use a check-off box that you provided with the initial notice but did not include with the subsequent notice.
If you wish to opt out of disclosures to nonaffiliated third parties, you may [describe a reasonable means of opting out, such as "call the following toll-free number: (insert number).