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Histology HTL Exam- BOC Study Guide > Chapter 4: Safety > Flashcards

Chapter 4: Safety Flashcards

1
Q

What hazard classification would silver nitrate fall under?

A

It would be considered a chemical hazard.

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2
Q

T/F: Xylene is BOTH toxic and flammable.

A

True.

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3
Q

T/F: Formaldehyde is considered a possible carcinogen.

A

True. Formaldehyde is a carcinogen, a reducing substance, non flammable and is slightly acidic.

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4
Q

What is considered an explosive compound that should NOT be stored in the lab?

A

Anhydrous picric acid.

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5
Q

A type A fire extinguisher should be used on what kind of fire?

A

Paper or wood because a type A is a water based extinguisher.

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6
Q

Which OSHA standard would be concerned with HIV and HBV?

A

The bloodbourne pathogen standard.

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7
Q

T/F: Blood can be disposed of in the sink according to the CDC and the Environmental Protective Agency (EPA).

A

True.

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8
Q

How long should employee training record be kept for Hazard Communications classes?

A

The duration of the employment plus an additional 30 years.

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9
Q

What is the Time Weighted Average (TWA) exposure limit of formaldehyde?

A

0.75 ppm.

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10
Q

In a lab, the TWA of formaldehyde is found to be .60ppm, is this okay?

A

A medical surveillance program needs to be established, this exposure is too close to 0.75ppm (it should be around 0.5ppm)

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11
Q

What kind of extinguisher should be used on electrical fires?

A

C.

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12
Q

What kind of extinguisher should be used on fires involving xylene?

A

B, because those are the fires that involve alcohols and flammable solvents.

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13
Q

Which OSHA standard would involve the development of a chemical hygiene plan?

A

The laboratory standard.

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14
Q

Monitoring of formaldehyde exposure shows the STEL to be 2.0ppm. What does this mean?

A

Any action would be dependent on the TWA and action level.

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15
Q

The amount of a chemical compound that expected to cause death of half of the population upon ingestion is the:

A

LD50.

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16
Q

Why can concentrated HCl NOT be disposed of in the sink?

A

Because HCl is classified as a corrosive.

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17
Q

Why is isopentane considered very hazardous?

A

Isopentane has a flash point of under 0C so it is VERY flammable.

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18
Q

HCl (~6N) has been splashed on the lab or a worker. What should be the next course of action?

A

Wash the arm for 10 minutes with cold water and soap, then seek medical attention if needed.

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19
Q

What is the maximum working volume (in gallons) of flammable liquid allowed 100sqft outside the flammable cabinet?

A

1.

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20
Q

When used in the National Fire Protection Association (NFPA) diamond, what number indicated a minor hazard?

A

1.

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21
Q

The left blue diamond in the NFPA chemical hazard label provides information on which hazard?

A

Health hazards.

22
Q

The top red diamond on the NFPA chemical hazard label provides information on which hazard?

A

Flammability.

23
Q

The right yellow diamond in the NFPA chemical hazard label provides information on which kind of hazard?

A

Reagent reactivity.

24
Q

What is a prion?

A

An abnormal protein.

25
Q

The revised Hazard Communications Standard requirements for chemical labels will require what?

A

A pictogram, a signal word and a hazard statement.

26
Q

T/F: According to universal precautions, specimen containers must be labeled with a biohazard label if they contain potentially infectious material.

A

True.

27
Q

T/F: Specimens may be returned to the patient without any risk.

A

False, there are risks with giving fixed tissue back to patients.

28
Q

T/F: Cryogenic sprays pose little risk when used to freeze tissue in a cryostat.

A

False, they should NOT be used in the cryostat because they will blow the pathogens back out of the cryostat.

29
Q

T/F: All infectious waste should be placed in biohazard containers.

A

True.

30
Q

T/F: Ergonomics associate cumulative trauma disorders with the working environment.

A

True. They seek to reduce repeated motion injuries.

31
Q

T/F: An SDS on each chemical used in the lab must be available to all employees.

A

True.

32
Q

T/F: The PEL for an 8 hour formaldehyde exposure is 0.5ppm.

A

False its 0.75 ppm.

33
Q

T/F: Class D fires are a marked concern in histopathology.

A

False, class D fires involve combustible and unstable elements, these are not used in the lab.

34
Q

T/F: Some automatic Halon extinguishers cannot be used in areas in which employees would be expected to remain after discharge of the extinguishing agent.

A

True.

35
Q

T/F: The volume of liquid contained in a flammable cabinet is unregulated.

A

False. 1 gallon per 100sqft outside the cabinet and 2 gallons inside the cabinet.

36
Q

T/F: Hydrated picric acids pose less of a threat than anhydrous picric acids.

A

True, anhydrous picric acid is extremely explosive.

37
Q

T/F: Acids should be diluted by pouring the concentrated acid into water.

A

True.

38
Q

T/F: Reactions as severe as anaphylaxis have been noted due to the increased use of vinyl gloves.

A

False, latex caused allergic reactions and not vinyl.

39
Q

T/F: Prions are sensitive to formalin fixation.

A

No, that’s why we have a separate protocol for CJD/prion disease.

40
Q

T/F: Because of a dramatic increase in TB in health care settings, a documented TB exposure control plan should be put into place.

A

True.

41
Q

T/F: Signal words such as “Danger” are used on labels to indicate the relative level of severity of a hazard.

A

True.

42
Q

What are the four types of infectious wastes?

A

Blood, sharp objects, pathologic material, culture waste and microbiologic material.

43
Q

How long should suspected CJD brain cases be fixed?

A

Sections of brain should be fixed for 48 hours and whole brain should be fixed for 10-14 days.

44
Q

What is the “right to know” law?

A

That appropriate labels must appear on both the chemical containers received from the manufacturer and any reagents in the lab.

45
Q

What three elements are required on chemical labels?

A

A pictogram, signal words and a hazard statement.

46
Q

Why are cryogenic sprays not used in the cryostat?

A

Because the aerosolized nature of the spray will markedly increase the possibility of contamination.

47
Q

What is the maximum allowable TWA of formaldehyde?

A

0.75 ppm.

48
Q

What is a carcinogen?

A

A substance that causes or greatly increases the risk of malignant disease.

49
Q

How is fire defined?

A

The rapid oxidation of a fuel in the presence of an ignition source.

50
Q

What is a mechanical hazard?

A

Sharp objects puncturing the skin.

Histology HTL Exam- BOC Study Guide (15 decks)

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