COHN Toxicology and Biohazards 4

Question 1

A battery manufacturing worker with elevated blood lead level (BLL) of 50 µg/dL is asymptomatic. According to OSHA's Lead Standard, the occupational health nurse should:

Accepted Answer

Remove the worker from lead exposure until BLL falls below 40 µg/dL

Answer

OSHA's Lead Standard (29 CFR 1910.1025) requires medical removal when BLL reaches 50 µg/dL, with return to work prohibited until BLL falls below 40 µg/dL on two successive tests.

Question 2

Which class of fire extinguisher is appropriate for a fire involving energized electrical equipment?

Accepted Answer

Class C

Answer

Class C extinguishers use non-conductive extinguishing agents (CO₂ or dry chemical) safe for energized electrical equipment, where water-based Class A agents would create electrocution risk.

Question 3

A semiconductor fabrication worker is exposed to arsine (AsH₃) gas. The MOST critical early target organ affected by acute arsine toxicity is the:

Accepted Answer

Red blood cells, causing massive hemolysis

Answer

Arsine causes rapid, massive hemolysis of red blood cells, leading to hemoglobinuria, acute renal failure (secondary), and potentially fatal anemia — hemolysis is the primary acute mechanism.

Question 4

Which OSHA standard requires employers to label containers of hazardous chemicals and train workers on chemical hazards using a standardized 16-section format?

Accepted Answer

Hazard Communication Standard (29 CFR 1910.1200)

Answer

OSHA's Hazard Communication Standard (HazCom/GHS) requires Safety Data Sheets in 16-section GHS format, GHS-compliant labeling, and worker training on chemical hazards.

Question 5

A paint shop worker develops contact dermatitis after starting to use a new solvent. The MOST important initial nursing intervention is:

Accepted Answer

Identify the causative agent through patch testing and remove exposure

Answer

Identifying the specific causative agent through patch testing is essential for accurate diagnosis and targeted exposure elimination; symptomatic treatment alone allows continued sensitization.

COHN Exam Practice Test

COHN Exam Practice Test

COHN Toxicology and Biohazards 4