Laboratory Assistants work in a laboratory setting, performing a variety of tasks such as logging in patient specimens, adding fixatives and preservatives to specimens, smearing specimens onto microscopic glass slides, transcribing laboratory tests results into a computer, preparing media and reagents, or assigning, training, and reviewing the work of a group of lower-level laboratory positions. Veteran's Credit: Pursuant to the County Charter and County policy, in all open competitive examinations (i.e., examinations open to everyone), the County of Los Angeles will add a credit of 10 percent of the total credits specified for such examination to the final passing score of an honorably discharged veteran, as well as the spouse of a deceased or disabled veteran, who served in the Armed Forces of the United States under specific conditions.