1|Page
AALAS LABORATORY ANIMAL TECHNICIAN
(LAT) CERTIFICATION ACTUAL EXAM PREP
2026 ALL QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES
ALREADY A GRADED WITH EXPERT
FEEDBACK |NEW AND REVISED
1. Through the AALAS Certification Program, technicians become
nationally certified. Name the three progressive levels of technician
certification.
A. CMT, CMA, CMAR
B. LVT, CVT, RVT
C. ALAT, LAT, LATG
D. ACLAM, LAMA, DACLAM
Rationale: The AALAS certification program offers three progressive
levels: Assistant Laboratory Animal Technician (ALAT, entry-level
husbandry), Laboratory Animal Technician (LAT, intermediate
technical procedures), and Laboratory Animal Technologist (LATG,
advanced/management level).
2. What governmental agency enforces the Animal Welfare Act
(AWA)?
A. National Institutes of Health (NIH)
B. Food and Drug Administration (FDA)
C. United States Department of Agriculture (USDA)
D. Environmental Protection Agency (EPA)
Rationale: The Animal Welfare Act is enforced by the USDA through
its Animal and Plant Health Inspection Service (APHIS). This agency
conducts inspections of regulated facilities and enforces compliance
with the Animal Welfare Regulations.
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3. What is the correct order of entry for a clean animal room to maintain
biosecurity?
A. PPE donning → dirty side → husbandry → clean side → decon exit
B. Clean side → PPE donning → husbandry → decon exit → dirty side
C. PPE donning → enter clean side → husbandry → dirty side →
decon exit
D. Decon exit → PPE donning → clean side → husbandry → dirty side
Rationale: The correct traffic pattern in an animal facility is to move
from clean to dirty areas. Technicians don PPE, enter the clean side of
the room, perform husbandry, then exit through the dirty side,
removing contaminated PPE for decontamination.
4. Which environmental enrichment is most appropriate for mice?
A. Running wheel
B. Salt lick
C. Nesting material (e.g., cotton squares, paper strips)
D. Mirror
Rationale: Mice are nesting rodents and benefit greatly from nesting
material (cotton squares, paper strips, shredded paper), which allows
them to exhibit natural burrowing and thermoregulatory behavior.
5. What group was established in 1950 to ensure the welfare of
laboratory animals and later became AALAS?
A. American College for Laboratory Animals
B. Animal Care Panel (now AALAS)
C. Institute for Laboratory Animal Research
D. American Veterinary Medical Association
Rationale: The Animal Care Panel was established in 1950 and later
became the American Association for Laboratory Animal Science
(AALAS). This organization was founded to advance the humane care
and responsible use of laboratory animals.
6. A principal investigator plans to inject a new chemical compound
intravenously into a mouse. The technician must confirm which step
,3|Page
before starting the procedure?
A. The compound is mixed with food.
B. An IACUC-approved protocol is in place.
C. The mouse is not needed for breeding.
D. The compound is listed on the MSDS.
Rationale: Before any animal procedure begins, there must be an
IACUC-approved protocol detailing the justification, methods, and
endpoints. Training documentation must also be current.
7. For an adult mouse weighing 20-25 g, what is the normal heart rate
range?
A. 100-200 bpm
B. 200-300 bpm
C. 310-840 bpm
D. 80-120 bpm
Rationale: Adult mice have a very high metabolic rate; normal heart
rate ranges from 310 to 840 beats per minute. This knowledge is
essential for monitoring during procedures and anesthesia.
8. The recommended temperature range for a standard conventional
rodent room is:
A. 50-64°F (10-18°C)
B. 64-79°F (18-26°C)
C. 80-90°F (27-32°C)
D. 95-100°F (35-38°C)
*Rationale: The Guide for the Care and Use of Laboratory Animals
recommends a temperature range of 64–79°F (18–26°C) for rodent
housing to maintain animal well-being and experimental consistency.*
9. What is the recommended relative humidity range for animal housing
areas?
A. 0-20%
B. 20-35%
C. 30-70%
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D. 80-95%
Rationale: The Guide for the Care and Use of Laboratory Animals
recommends a relative humidity range of 30–70% to prevent
respiratory issues and maintain animal health.
10. How many air changes per hour (ACH) are typically recommended
for animal rooms in a conventional facility?
A. 1-3 ACH
B. 5-8 ACH
C. 10-15 ACH
D. 20-30 ACH
*Rationale: Conventional animal facilities typically require 10-15 air
changes per hour to maintain air quality, remove waste gases (e.g.,
ammonia), and control allergens.*
11. What light cycle is standard for rodent housing to maintain normal
circadian rhythms?
A. 8:16 light-dark
B. 12:12 hour light-dark
C. 16:8 light-dark
D. Continuous light
*Rationale: A 12:12 hour light-dark cycle is standard for rodent housing
to maintain normal circadian rhythms, reproductive cycles, and
hormonal balance.*
12. Which bedding type is most commonly used for rodent cages?
A. Cedar shavings
B. Pine shavings (untreated)
C. Autoclaved corncob or aspen shavings
D. Cotton balls
Rationale: Autoclaved corncob or aspen shavings are the most
common bedding choices. They are absorbent, low-dust, and do not
contain aromatic hydrocarbons that can induce liver enzymes (unlike
cedar or untreated pine).
AALAS LABORATORY ANIMAL TECHNICIAN
(LAT) CERTIFICATION ACTUAL EXAM PREP
2026 ALL QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES
ALREADY A GRADED WITH EXPERT
FEEDBACK |NEW AND REVISED
1. Through the AALAS Certification Program, technicians become
nationally certified. Name the three progressive levels of technician
certification.
A. CMT, CMA, CMAR
B. LVT, CVT, RVT
C. ALAT, LAT, LATG
D. ACLAM, LAMA, DACLAM
Rationale: The AALAS certification program offers three progressive
levels: Assistant Laboratory Animal Technician (ALAT, entry-level
husbandry), Laboratory Animal Technician (LAT, intermediate
technical procedures), and Laboratory Animal Technologist (LATG,
advanced/management level).
2. What governmental agency enforces the Animal Welfare Act
(AWA)?
A. National Institutes of Health (NIH)
B. Food and Drug Administration (FDA)
C. United States Department of Agriculture (USDA)
D. Environmental Protection Agency (EPA)
Rationale: The Animal Welfare Act is enforced by the USDA through
its Animal and Plant Health Inspection Service (APHIS). This agency
conducts inspections of regulated facilities and enforces compliance
with the Animal Welfare Regulations.
,2|Page
3. What is the correct order of entry for a clean animal room to maintain
biosecurity?
A. PPE donning → dirty side → husbandry → clean side → decon exit
B. Clean side → PPE donning → husbandry → decon exit → dirty side
C. PPE donning → enter clean side → husbandry → dirty side →
decon exit
D. Decon exit → PPE donning → clean side → husbandry → dirty side
Rationale: The correct traffic pattern in an animal facility is to move
from clean to dirty areas. Technicians don PPE, enter the clean side of
the room, perform husbandry, then exit through the dirty side,
removing contaminated PPE for decontamination.
4. Which environmental enrichment is most appropriate for mice?
A. Running wheel
B. Salt lick
C. Nesting material (e.g., cotton squares, paper strips)
D. Mirror
Rationale: Mice are nesting rodents and benefit greatly from nesting
material (cotton squares, paper strips, shredded paper), which allows
them to exhibit natural burrowing and thermoregulatory behavior.
5. What group was established in 1950 to ensure the welfare of
laboratory animals and later became AALAS?
A. American College for Laboratory Animals
B. Animal Care Panel (now AALAS)
C. Institute for Laboratory Animal Research
D. American Veterinary Medical Association
Rationale: The Animal Care Panel was established in 1950 and later
became the American Association for Laboratory Animal Science
(AALAS). This organization was founded to advance the humane care
and responsible use of laboratory animals.
6. A principal investigator plans to inject a new chemical compound
intravenously into a mouse. The technician must confirm which step
,3|Page
before starting the procedure?
A. The compound is mixed with food.
B. An IACUC-approved protocol is in place.
C. The mouse is not needed for breeding.
D. The compound is listed on the MSDS.
Rationale: Before any animal procedure begins, there must be an
IACUC-approved protocol detailing the justification, methods, and
endpoints. Training documentation must also be current.
7. For an adult mouse weighing 20-25 g, what is the normal heart rate
range?
A. 100-200 bpm
B. 200-300 bpm
C. 310-840 bpm
D. 80-120 bpm
Rationale: Adult mice have a very high metabolic rate; normal heart
rate ranges from 310 to 840 beats per minute. This knowledge is
essential for monitoring during procedures and anesthesia.
8. The recommended temperature range for a standard conventional
rodent room is:
A. 50-64°F (10-18°C)
B. 64-79°F (18-26°C)
C. 80-90°F (27-32°C)
D. 95-100°F (35-38°C)
*Rationale: The Guide for the Care and Use of Laboratory Animals
recommends a temperature range of 64–79°F (18–26°C) for rodent
housing to maintain animal well-being and experimental consistency.*
9. What is the recommended relative humidity range for animal housing
areas?
A. 0-20%
B. 20-35%
C. 30-70%
, 4|Page
D. 80-95%
Rationale: The Guide for the Care and Use of Laboratory Animals
recommends a relative humidity range of 30–70% to prevent
respiratory issues and maintain animal health.
10. How many air changes per hour (ACH) are typically recommended
for animal rooms in a conventional facility?
A. 1-3 ACH
B. 5-8 ACH
C. 10-15 ACH
D. 20-30 ACH
*Rationale: Conventional animal facilities typically require 10-15 air
changes per hour to maintain air quality, remove waste gases (e.g.,
ammonia), and control allergens.*
11. What light cycle is standard for rodent housing to maintain normal
circadian rhythms?
A. 8:16 light-dark
B. 12:12 hour light-dark
C. 16:8 light-dark
D. Continuous light
*Rationale: A 12:12 hour light-dark cycle is standard for rodent housing
to maintain normal circadian rhythms, reproductive cycles, and
hormonal balance.*
12. Which bedding type is most commonly used for rodent cages?
A. Cedar shavings
B. Pine shavings (untreated)
C. Autoclaved corncob or aspen shavings
D. Cotton balls
Rationale: Autoclaved corncob or aspen shavings are the most
common bedding choices. They are absorbent, low-dust, and do not
contain aromatic hydrocarbons that can induce liver enzymes (unlike
cedar or untreated pine).
