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Observation Codes

These are codes which are to be used by lab personnel to note tumor observations in research subjects.


Observers are individuals who may be in close proximity to animals during a research or learning activity but must not handle the animals or perform any procedures.


Occupational Health Services. The U-M department responsible for providing Michigan Medicine and Ann Arbor campus faculty and staff with services for the prevention, treatment, and rehabilitation of occupational illnesses and injuries.


The Office of Laboratory Animal Welfare. OLAW is a division of the National Institutes of Health (NIH), and the regulating body for all activities funded by the federal government, including the NIH and the National Science Foundation (NSF). OLAW's primary standards are the Public Health Service Policy on Humane Care and Use of Laboratory Animals (PHS Policy), and the Guide for the Care and Use of Animals (Guide).

Old World Monkeys (OWM)

Asian monkeys including rhesus, cynomolgus, and pigtailed monkeys; or African monkeys including baboons, African green monkeys, and patas monkeys.

Opaque Cages

Cages that are not transparent but receptive to changes in light, generally used to minimize animal stress levels.


A class of drugs that include natural, semisynthetic, and synthetic opioids.

  • Natural opioids (i.e., opiates) include: opium and morphine
  • Semisynthetic opioids include: heroine and oxycodone
  • Synthetic opioids include: buprenorphine, tramadol and fentanyl


Contagious ecthyma, also known as orf or contagious pustular dermatitis, can cause crusting scabs anywhere on the body. Lesions are most frequently seen on the lips, nose, eyelids, tongue, ear, udder, and mucous membranes of sheep. In humans, the disease usually causes a firm, painful nodule on the hands or fingers. This localized lesion usually persists for 1-4 weeks.

Contagious ecthyma is transmissible to humans by direct contact with a lesion or with a contaminated fomite (e.g., bedding, equipment, manure, feed).

Outer Buildings

Buildings that are outside of Medical Campus and North Campus Research Complex such as: Pharmacy Building, East Hall, Undergraduate Science Building, Chemistry Building, School of Public Health Building, Kraus Building, Biological Science Building, Biomedical Engineering, and Natural Science Building.


Surgical removal of the female reproductive organs.


In the context of the Policy on the Authority and Responsibility of the Quality Assurance Program, oversee refers to conducting reviews of approved animal activities on behalf of the IACUC to ensure that governing standards are satisfied.


Time spent providing services outside regular veterinary technician working hours (M-F 6 a.m.-5 p.m.), on weekends, and on holidays. Overtime charges will be calculated by business office personnel at a rate of 1.5 times the total time recorded during after hours/weekends/holidays.


Any oxidizer can be an element of a surgical fire including oxygen, anesthetic gases, nitrous oxide, medical air, and ambient air.