Infection Control in Phlebotomy: Principles, Practices, and Procedures

Infection Control in Phlebotomy

Introduction

Infection control is a critical aspect of phlebotomy and clinical laboratory practice. It involves a series of policies, procedures, and techniques designed to prevent the transmission of infectious agents during specimen collection, handling, and processing. This section summarizes the foundational concepts, standard precautions, and specific practices necessary to ensure safety for both healthcare workers and patients.

Pathogens and Infections

Types of Microorganisms

• Pathogenic microorganisms: Cause disease in humans (e.g., bacteria, viruses, fungi).

• Nonpathogenic microorganisms: Do not cause disease under normal circumstances.

Communicable Diseases

• Diseases that can be transmitted from one individual to another by direct or indirect contact, or as airborne infections.

Blood-borne Pathogens (BBPs)

• Examples include Hepatitis A, B, C, D, E; HIV (AIDS); Syphilis; Malaria; Human T-cell lymphotrophic virus (HTLV) types I and II; Ebola virus; Zika virus.

Health Care-Associated (Nosocomial) Infections (HAIs)

• Infections acquired by patients after admission to a healthcare facility.

• Approximately 1 in 20 hospitalized patients will contract an HAI.

• Guidelines for control are provided by CDC, NIOSH, The Joint Commission, and state agencies.

Antibiotic-Resistant Microorganisms

• MRSA (Methicillin-resistant Staphylococcus aureus) and VRE (Vancomycin-resistant enterococci): Cause severe infections, including bloodstream infections, pneumonia, and sepsis.

• Clostridium difficile (C. difficile): Causes colitis (inflammation of the colon).

Aseptic Techniques

• Frequent hand hygiene (handwashing or alcohol-based hand rubs).

• Use of barrier garments and personal protective equipment (PPE).

• Proper waste management and cleaning solutions.

• Use of sterile procedures when necessary.

Personal Safety from Infection During Specimen Handling

OSHA Regulations

• The Occupational Safety and Health Administration (OSHA) requires employers to protect workers exposed to biological hazards.

Universal Precautions

• Healthcare workers must wear gloves when exposed to blood or body fluids.

• Warning labels must be placed on containers with blood or potentially infectious materials.

Exposure Control Procedures

• Immediately decontaminate needlestick sites with soap and water.

• Flush exposed mucous membranes with water or sterile saline for 10-15 minutes.

• Report incidents to supervisors and undergo medical evaluation.

• Document exposure incidents thoroughly.

Employee Health Programs

• Objective: Minimize risk of infection or hazardous circumstances for employees and patients.

• Pre-employment screening for diseases such as measles, mumps, tuberculosis, hepatitis, diarrheal diseases, syphilis, and skin diseases.

Chain of Infection

Components of the Chain

• Pathogen: Disease-causing microorganism (e.g., bacteria, viruses, fungi, prions, protozoa, worms).

• Reservoir: Where the pathogen lives (e.g., people, animals, soil, water, medical equipment).

• Portal of Exit: How the pathogen leaves the reservoir (e.g., blood, urine, stool, wound secretions, respiratory droplets).

• Mode of Transmission: How the pathogen is spread (e.g., direct contact, airborne, fomites, vectors).

• Portal of Entry: How the pathogen enters a new host (e.g., mucous membranes, GI tract, respiratory tract, broken skin).

• Susceptible Host: Individuals at risk due to age, immune status, illness, or lack of vaccination.

Breaking the Chain of Infection

• Handwashing, proper waste disposal, and housekeeping control sources of infection.

• Isolation, sterilization, and use of disposable equipment interrupt transmission.

• Immunizations, nutrition, and exercise reduce host susceptibility.

Standard Precautions

Definition and Scope

• Standard precautions are designed to reduce the risk of transmission of microorganisms from both recognized and unrecognized sources in hospitals.

• Include universal precautions to prevent transmission of all infectious agents.

Protection Provided

• Protection from contact with blood, all body fluids, mucous membranes, and nonintact skin.

Transmission-Based Precautions

• Airborne precautions: Reduce spread of airborne droplet transmission.

• Droplet precautions: Reduce disease transmission through contact with mucous membranes via large-particle droplets.

• Contact precautions: Reduce risk of transmission through direct or indirect contact.

Use of Personal Protective Equipment (PPE)

• PPE is used to prevent percutaneous and permucosal exposure when contact with blood or body fluids is anticipated.

• Hands and other skin surfaces must be washed immediately if contaminated and after removing gloves.

Summary Table: Chain of Infection

Component	Description	Example
Pathogen	Disease-causing microorganism	Staphylococcus aureus
Reservoir	Where pathogen lives	Infected patient
Portal of Exit	How pathogen leaves reservoir	Respiratory droplets, wound secretions
Mode of Transmission	How pathogen is spread	Hands, fomites, airborne
Portal of Entry	How pathogen enters new host	Open wound, nasal cavity
Susceptible Host	Individual at risk	Hospitalized patient, healthcare worker

Key Points for Exam Preparation

• Understand the definitions and examples of pathogens, reservoirs, and modes of transmission.

• Be able to describe and apply standard and transmission-based precautions.

• Know the steps for personal safety and exposure control in the clinical setting.

• Recognize the importance of hand hygiene and proper use of PPE.

• Be familiar with the chain of infection and methods to break it.