Urinalysis and Body Fluids, 5th Edition

SAFETY IN THE CLINICAL LABORATORY

Chapter 1 Overview

  • Focus: Ensuring safety in laboratory settings, particularly regarding biological risks, chemical hazards, and equipment safety.
  • Emphasis on regulations, guidelines, and personal protective equipment (PPE).

Biological Hazards

Chain of Infection
  • Components:
    • Transmission of microorganisms: Understanding how infections spread.
    • Source: Origin of the microorganisms, including various pathogens.
    • Specimen/Patient: Role of infected individuals or specimens in disease transmission.
    • Transmission routes:
    • Direct contact: Physical interaction with infected surfaces or individuals.
    • Inhalation: Breathing in airborne pathogens.
    • Ingestion: Consuming contaminated substances.
    • Host: Refers to individuals (YOU) who may be susceptible to infection.

Regulations and Guidelines

Universal Precautions (UP) & Body Substance Isolation (BSI) (CDC)
  • Universal Precautions: Introduced in 1987 to prevent blood-borne pathogens such as HIV and HBV.
    • Use of gloves and face shields when dealing with visibly bloody specimens.
    • Requirement for puncture-resistant containers for disposal.
  • Body Substance Isolation (BSI):
    • Encompasses all body fluids and moist body substances, emphasizing the importance of using gloves at all times regardless of visible blood presence.
Standard Precautions (SP) (CDC)
  • Hand washing: Mandatory immediately after glove removal.
  • Use of Gloves: Required for blood, body fluids, secretions, excretions, and any contaminated items.
  • Additional protective gear:
    • Mask, Eye Protection, Face Shield: Protects mucous membranes against sprays and aerosols.
    • Gown: Should be selected based on expected volume of fluid exposure.
  • Patient-care equipment:
    • Must be disposed of or sterilized according to protocol.
  • Environmental Control:
    • Emphasis on cleaning and disinfecting surfaces and handling linens properly to prevent contamination.
  • Management of Blood-borne Pathogens:
    • Prohibition on needle recapping to prevent needle-stick injuries.
    • Patient placement in isolation is allowed when necessary.

Occupational Exposure to Blood-borne Pathogens Standard (Law)

  • Regulatory Oversight: Enforced by OSHA (Occupational Safety and Health Administration).
  • Employer Responsibilities:
    • Provision of protective equipment (gowns, gloves, masks, face protection).
    • Facilities for laundering nondisposable garments.
    • Safe disposal mechanisms for sharps and hazardous materials.
    • Strict prohibition on eating, drinking, smoking, or applying cosmetics in work areas.
  • Safety Protocols:
    • Requirement to label all hazardous materials clearly.
    • Free immunization against HBV for all staff.
    • Daily disinfectant protocol established using a bleach solution at a ratio of 1:10.
    • Medical follow-up for any workers exposed to blood-borne pathogens is mandated.
    • Documentation of regular employee safety training and compliance inspections is required.

Postexposure Prophylaxis

  • Immediate Action Required:
    • Report any accidents immediately to a supervisor.
  • Testing Procedures: Must be done without delay for both employees and patients.
  • Timely Prophylaxis:
    • HIV exposure prophylaxis should commence within 24 hours of exposure.

Personal Protective Equipment (PPE)

Types and Usage
  • Gloves:
    • Types include sterile, nonsterile, powdered, nonpowered, latex, and nonlatex.
    • Latex Allergy: Potential delayed reaction includes dry, itchy rash, while immediate reactions may lead to facial flushing and difficulty breathing.
    • It is crucial to report symptoms as reactions can be fatal.
  • Fluid-Resistant Lab Coats:
    • Essential for protecting skin and clothing.
    • Must be completely buttoned with gloves covering the wrist cuffs.
    • Change immediately if visibly soiled and discard according to biohazard waste protocols.
  • Face Protection:
    • Include goggles, full-face plastic shields, and Plexiglas countertop shields to avoid splashes.
    • Centrifuge Caution: Never centrifuge uncapped specimens, and ensure the exterior of containers is disinfected and new specimens requested as per protocol.

Hand Washing Protocol

  1. Wet hands with warm water.
  2. Apply soap and rub to create friction to loosen debris.
  3. Ensure cleaning between fingers, thumbs, nails, rings, and up to the wrist.
  4. Rinse hands in a downward position to avoid contamination.
  5. Dry hands thoroughly with a paper towel.
  6. Use a paper towel to turn off the faucet to maintain hygiene.

Disposal of Biological Waste

  • Waste Management:
    • Specimens and contact materials must be disposed of in containers marked with a biohazard symbol.
    • Containers must be handled following established protocols, with urine waste disposed of down sinks with precautions against splashes.
    • Ensure to flush sinks with water and perform regular sodium hypochlorite flushes (1:5 or 1:10 ratio), applicable also for countertops.
    • Storage should protect materials from light exposure.

Sharp Hazards

  • Include needles, lancets, and broken glassware:
    • Must always use puncture-resistant containers conveniently located within the laboratory areas.

Chemical Hazards

General Guidelines
  • Similar management rules as biological hazards.
  • Precautions: Avoid ingestion and skin contact; treat all chemicals as hazardous.
  • Flammable Materials: Must be stored in safety cabinets or explosion-proof refrigerators.
  • Compressed Gases: Should be securely fastened, away from heat sources.
Chemical Spills
  • First Aid for Contaminants: In case of skin/eye contact, flush the affected area with water for an extended period (minimum 15 minutes) then seek medical help.
  • Chemical Knowledge: Know the location of eyewash stations and showers. Avoid neutralizing chemicals with other substances; for acid contact, simply use water.
  • Chemical Spill Kits:
    • Equip with protective apparel, nonreactive absorbent material, and disposal bags.

Chemical Hygiene Plan

  • A written plan required by OSHA must include:
    • Appropriate work practices and standard operating procedures.
    • Selection and use of PPE (Personal Protective Equipment).
    • Engineering controls, including hoods and safety cabinets.
    • Employee training specifics and medical consultation guidelines.
    • Appointment of a Chemical Hygiene Officer to oversee plan implementation.

Chemical Labeling

  • Hazard Labels: Include identifiers for poisons, corrosives, and carcinogenic substances.
  • NFPA Symbols: Utilize the National Fire Protection Association (NFPA) labeling for indicating hazards on doors, cabinets, and containers related to fire risks.

Material Safety Data Sheets (MSDS)

  • Requirement by OSHA: Employees have the right to know about chemical hazards in the workplace.
  • Documentation: Facilities must maintain a file of MSDS provided by vendors, ensuring availability for all employees.
MSDS Information Must Include:
  • Physical and chemical characteristics of materials.
  • Fire and explosion potential of substances.
  • Reactivity potential and health hazards.
  • Emergency first aid measures.
  • Safe handling and disposal methods.

Radioactive Hazards

  • Presence of radioisotopes in laboratories presents a slight danger.
  • Signage must be displayed on doors indicating the presence of radiation.
  • Radiographers: Must wear badges to monitor exposure levels. Pregnant individuals should avoid areas marked with radioactive symbols.

Electrical Hazards

Safety Measures
  • Avoid contact with water or any fluids when handling electrical equipment.
  • Inspect and report any fraying cords or equipment overloads; ensure all equipment is unplugged and dried before use.
  • All electrical equipment should be grounded with three-pronged plugs for added safety.
Electrical Shock Accidents
  • First Response: Do not touch the person experiencing the shock.
    • Remove the electrical source from the individual safely (such as turning off a circuit breaker or unplugging equipment).
  • Use non-conductive materials (wood or glass) to move electrical equipment if necessary.

Fire and Explosive Hazards

Emergency Quality Measures
  • Compliance with JCAHO guidelines: Must have evacuation routes and a detailed emergency response plan.
  • RACE Protocol:
    • Rescue anyone in danger.
    • Alarm: Activate the fire alarm system.
    • Contain the fire by closing affected area doors.
    • Extinguish if safe to do so, else evacuate.
Fire Extinguisher Operation
  • Utilize the PASS method for operating fire extinguishers:
    1. Pull the pin.
    2. Aim at the base of the fire.
    3. Squeeze handles tightly.
    4. Sweep nozzle side to side until the fire is extinguished.

Physical Hazards

  • Common risks include:
    • Running in facilities or hallways.
    • Slip hazards such as wet floors.
    • Lifting heavy objects improperly.
    • Loose hair must be tied back to avoid accidents.
    • Avoid wearing dangling jewelry and open-toed shoes during laboratory work to prevent injuries.