Safety in the Clinical Laboratory

Safety in the Clinical Laboratory

Biological Hazards

  • Chain of Infection: Understanding the components involved in the transmission of infections is crucial in a clinical setting.
    • Transmission of Microorganisms: Involves multiple pathways through which infections spread, including:
    • Source: The origin of the infectious agent (such as patients or specimens).
    • Specimen / Patient: Samples taken from patients which can be infectious.
    • Transmission Routes:
      • Direct Contact: Physical contact with infectious agents.
      • Inhalation: Breathing in infectious particles.
      • Ingestion: Consuming substances contaminated with infectious agents.
    • Host: Refers to the personnel (YOU) who may be exposed to infections.

Regulations and Guidelines

  • Universal Precautions (UP): Guidelines set forth by CDC and OSHA to prevent exposure to blood-borne pathogens established in 1987 to address infections such as HIV and HBV.
    • Requirements include:
    • Gloves and Face Shields: Required when handling visibly bloody specimens.
    • Puncture-Resistant Containers: For disposal of sharp items to prevent injuries.
  • Body Substance Isolation (BSI): A protocol mandated by the CDC to treat all body fluids, whether visibly bloody or not, as potentially infectious.
    • Gloves: Mandatory at all times when handling any body fluids, however, handwashing was not emphasized.

Standard Precautions (SP)

  • Hand Washing: Essential procedure to prevent infection, must be performed:
    • Immediately after Removing Gloves: To eliminate contaminants transferred from gloves to hands.
  • Use of Gloves: When handling blood, body fluids, secretions, excretions, or contaminated items.
  • Masks, Eye Protection, and Face Shields: Necessary for protecting mucous membranes; particularly relevant to situations involving sprays or aerosols.
  • Gown: Must be appropriate based on the volume of fluid exposure anticipated.
  • Patient-Care Equipment: Must be disposed of or sterilized according to established protocols.
  • Environmental Control: Cleaning and disinfecting surfaces regularly to prevent contamination.
  • Handling of Blood-borne Pathogens:
    • No Needle Recapping: To prevent needle stick injuries.
    • Patient Placement: Isolation of patients when needed based on risk of pathogen transmission.

Occupational Exposure to Blood-borne Pathogens Standard (Law)

  • Enforcement by OSHA: All employees must adhere to Universal and Standard Precautions.
    • Employer Responsibilities:
    • Provide suitable protective equipment, including gowns, masks, and gloves.
    • Offer laundry facilities for non-disposables and a sharps disposal program.
    • Prohibit eating, drinking, smoking, or applying cosmetics in work areas.
  • Specific Provisions:
    • Labeling of Hazardous Materials: Essential for safety practices.
    • Immunization for HBV: Employers are required to provide vaccines.
    • Daily Disinfectant Protocol: Using a solution of household bleach at a ratio of 1:10.
    • Medical Follow-Up: Required for workers who experience any exposure to blood-borne pathogens.
    • Safety Training: Regular training on safety protocols is mandatory.

Postexposure Prophylaxis

  • Immediate Reporting: Any incident of exposure must be reported to a supervisor right away.
  • Testing: Needs to occur immediately for both involved individuals (worker and patient).
  • HIV Exposure Prophylaxis: Must commence within 24 hours to ensure effectiveness.

Personal Protective Equipment (PPE)

  • Gloves: Not a substitute for handwashing:
    • Types: Include sterile and nonsterile, powdered and nonpowered, latex and nonlatex.
    • Latex Allergy: Symptoms can include:
    • Delayed Reaction: Dry, itchy rash on the hands.
    • Immediate Reaction: Facial flushing and breathing difficulties; report these symptoms as they can be fatal.
  • Fluid-Resistant Lab Coats: Must protect skin and clothing; must be completely buttoned and gloves fitted over cuffs.
    • Wear When: Working with specimens; remove before leaving the lab.
    • Change: When visibly soiled.
    • Disposal: Discard disposable coats as biohazard waste and nondisposables in designated areas.
  • Face Protection: Includes goggles, full-face plastic shields to guard against splashes and aerosols.
    • Handling Contaminated Specimens: Must disinfect outer surfaces and if necessary, request a new specimen.

Hand Washing Procedure

  • Steps for Effective Hand Washing:
    • Wet hands with warm water.
    • Apply soap and rub to create friction, loosening debris.
    • Ensure to clean between fingers, thumbs, nails, rings, and up to wrists.
    • Rinse with hands in a downward position.
    • Dry with a paper towel and turn off faucet using the same towel to maintain hygiene.

Disposal of Biological Waste

  • Handling Biological Waste:
    • Biohazard symbol on waste containers.
    • Dispose of containers per established protocols.
    • Urine may be poured down the sink without splashing, then flush with water.
    • Containers with waste must be managed as biohazardous waste.
    • Implement daily flush protocol with sodium hypochlorite (1:5 or 1:10 ratio).

Sharp Hazards

  • Sharp Objects: Include needles, lancets, and broken glassware.
    • Must be disposed of in puncture-resistant containers located conveniently in the work area.

Chemical Hazards

  • Handling Chemicals: Similar to biohazard rules, all chemicals must be presumed hazardous.
    • Avoid ingestion, contacting with skin, clothing, or work areas.
    • Storage: Flammable materials must be in safety cabinets or explosion-proof refrigerators.
    • Ensure that compressed gases are secure and away from heat.

Chemical Spills

  • Response to Chemical Exposure:
    • For skin/eye contact, flush with water for at least 15 minutes and seek medical attention.
    • Learn the location of eyewash stations and showers for emergency use.
    • For acid contact, do not attempt to neutralize with bases; rinse only with water.
    • Chemical Spill Kits: Should include protective apparel and nonreactive materials for absorbing spills as well as disposal bags.

Chemical Hygiene Plan

  • Requirements: OSHA mandates that a written Chemical Hygiene Plan must include:
    • Appropriate work practices.
    • Standard Operating Procedures (SOP).
    • PPE stipulations.
    • Engineering controls such as fume hoods and safety cabinets.
    • Guidelines for employee training and medical consultation.
    • Appointment of a Chemical Hygiene Officer to oversee the plan.

Chemical Labeling

  • Hazard Labels: Information on potential hazards including poison, corrosive qualities, and carcinogenic risks.
    • Utilizing the National Fire Protection Association (NFPA) guidelines for symbols on doors, cabinets, and containers that indicate fire hazards.

Material Safety Data Sheets (MSDS)

  • OSHA Mandate: Each workplace must have a readily accessible file of MSDS to inform employees of hazardous chemicals.
    • Vendors are responsible for providing the data, but facilities have the obligation to compile and maintain the files.
  • MSDS Information Includes:
    • Physical and chemical characteristics of substances.
    • Fire and explosion potential, reactivity, and health hazards.
    • Emergency first aid procedures and methods for safe handling and disposal.

Radioactive Hazards

  • Handling Radioisotopes: Slight danger present within the lab environment dictated by specific safety symbols.
    • Staff working with these substances must wear badges to measure exposure levels.
    • Precaution for Pregnant Employees: Pregnant staff should avoid areas marked with radiation symbols.

Electrical Hazards

  • Precautions:
    • Avoid contact with water when using electrical equipment.
    • Operating equipment with wet hands is strictly prohibited.
    • Inspect for frayed cords or overloaded circuits and report immediately.
    • Unplug and dry any wet equipment thoroughly.
    • Ensure that all electrical devices are correctly grounded with three-pronged plugs.

Electrical Shock Accident Protocol

  • In Case of Accident:
    • Do Not Touch: Never make direct contact with the person affected.
    • Remove Electrical Source: Safely switch off the power.
    • Unplug Equipment: Disconnect any plugged-in devices responsible for the accident.
    • Move Equipment: Use wood or glass (nonconductive materials) to safely move any equipment if necessary.

Fire/Explosive Hazards

  • JCAHO Requirements: All workplaces must have evacuation routes and detailed fire safety plans.
    • RACE Protocol:
    • Rescue anyone in danger.
    • Alarm: Activate the nearest alarm system.
    • Contain the fire by closing affected area doors.
    • Extinguish the fire if safe, or evacuate the building.

Fire Extinguisher Operation

  • PASS Technique: To operate a fire extinguisher, remember the acronym:
    • Pull the pin.
    • Aim at the base of the fire.
    • Squeeze the handles together.
    • Sweep the nozzle side to side across the base of the fire.

Physical Hazards

  • Identifying Risks: Several physical hazards to be aware of in clinical settings include:
    • Running in rooms and hallways can cause accidents.
    • Being aware of wet floors to prevent slipping.
    • Proper techniques for lifting heavy objects to avoid injury.
    • Ensuring long hair is tied back and dangling jewelry is secured to prevent getting caught.
    • Wearing appropriate footwear, avoiding open-toed shoes to protect feet in a lab setting.