Microbiology Lab: Sample Collection Techniques

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Questions and Answers

Match the following types of biological specimens with their corresponding types:

Sputum = Bronchial / Wash / Lavage Pus = Wound Urine = Body Fluids Blood = Throat Swab

Match the following general guidelines for specimen collection with their descriptions:

Collect from the infection site = Avoid contamination from adjacent tissues Use appropriate transport media = Ensure specimen viability during transport Label the specimen correctly = Include specific source information Collect at optimal times = Enhance the chance of isolating pathogens

Match the following collection containers with their appropriate specimen types:

Sterile container = Urine Leak-proof container = Blood Culture swab = Pus Transport media = Sputum

Match the following antiseptic agents with their uses in skin preparation:

<p>70% Alcohol (ALC) = Decontaminate skin surface 2% Chlorhexidine = Prepare skin for invasive procedures 1-2% Tincture of Iodine (TIO) = Antiseptic for skin prior to specimen collection Hydrogen Peroxide = Not recommended for skin preparation</p> Signup and view all the answers

Match the following specimen collection concepts with their importance:

<p>Minimize transport time = Reduce risk of contamination Collect prior to antimicrobial agents = Prevent interference with culture results Use optimal collection times = Ensure higher recovery rates of organisms Use sterile techniques = Prevent introduction of contaminants</p> Signup and view all the answers

Flashcards

Specimen Collection

The process of obtaining samples from various parts of the body for laboratory examination.

Proper Specimen Collection

The most crucial step in identifying microorganisms causing infections. It determines the accuracy of laboratory results.

Targeted Specimen Collection

Collecting samples only from the infected area, avoiding contamination from surrounding tissues.

Adequate Sample Quantity

A sufficient amount of sample is needed for accurate testing, ensuring enough organisms are present for identification.

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Specimen Collection Before Medication

Antimicrobial agents can interfere with lab results, so specimens should be collected before drug administration.

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Study Notes

Microbiology Laboratory

  • Dr. Basma Samir (MD) is the instructor

Sample Collection in Microbiology

  • Includes various types of biological specimens

Types of Biological Specimens

  • Sputum
  • Urine
  • Feces
  • Blood
  • Bone marrow
  • Pus
  • Wound
  • Tissue
  • Body fluids
  • Bronchial wash/lavage
  • Throat swab
  • Ear
  • Eye

Generic Equipment Required

  • Transport medium containing swab
  • Wood sticks
  • Sterile cup
  • Sterile, disposable gloves
  • Acid Citrate Dextrose (ACD) tube for blood collection

Collection Containers

  • Variety of containers for different specimens
  • Sterile, leak-proof containers are crucial
  • Containers must be properly labeled with necessary patient information

Basic Concepts for Specimen Collection

  • Proper specimen collection is critical for accurate diagnosis of infectious diseases
  • Poor collection can lead to failure in isolating the causative organism(s) or contamination

General Guidelines for Specimen Collection

  • Collect specimen from the site of infection, avoid contamination
  • Collect specimens at optimal times (e.g., early morning sputum for AFB culture)
  • Collect sufficient quantity of material
  • Use sterile, leak-proof specimen containers
  • Use appropriate transport media
  • Check expiration date of collection devices
  • Collect prior to antimicrobial administration whenever possible
  • Properly label specimens and complete test request forms
  • Specific specimen source (e.g., wound, left leg) must be noted
  • Minimize transport time
  • Maintain appropriate environment during transport
  • Decontaminate skin surface if needed using 70% alcohol, 2% chlorhexidine, or 1-2% tincture of iodine (allow contact time of 2 minutes)

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