SPECIMEN COLLECTION

SPECIMEN COLLECTION – Definition, Purpose, Principles, Equipment, Procedure for Urine Collection, Urine Culture, Stool-Routine Test and Culture, Sputum Culture, Blood Smear, Blood Culture, Throat Swab, Vaginal Swab/Smear and Urine Testing

UPDATED 2024

DEFINITION

Specimen collection is defined as collection of a required amount of tissue of fluid for laboratory examination

Specimen may be defined as small quantity of a substance, which shows the kind and quality of the whole

PURPOSE

• To make diagnosis and to help in treatment
• To note progress or recess of a disease
• To observe the effects of special treatment and drugs
• To assess the general health of the patient
• To investigate the nature of the diseases
• To aid the doctor in diagnosis and treating the diseases

PRINCIPLE

• Contaminated and improperly collected specimens will produce false results which will adversely affect the diagnosis and treatment of patient
• Specimen allowed to stand at room temperature of a long time will give false results due to decomposition of specimen, multiplication of undesirable bacteria and destruction of pathogenic bacteria
• Blood chemistry is not uniform throughout the day. It varies with the good intake
• The accuracy and reliability of findings depend upon the correct method collection. Transportation of the specimens to the laboratory and recording of reports
• Inaccurate results may lead the physician in the diagnosis and treatment of patients
• Specimens serve as a media for transmission of disease producing organisms to the personnel who handle them carelessly

General Instruction

• Provide adequate explanations regarding the collection of specimens
• Ask the patient to wash the external genital area with soap and water then rinse with water alone before collecting urine specimens
• Equipment used for the collection of specimens should be clean and dry
• No antiseptic should be present in the specimen bottle
• As for as possible morning specimens are collected
• Specimens should be always fresh for the laboratory examination
• Bacteria multiply in the room temperature so, the specimens which are not tested immediately are kept in the refrigerator, because cold temperature inhibits the growth of bacteria
• Insist the patient and the personnel to wash hands thoroughly after handing the specimen bottles
• Container should have a wide mouth to prevent spilling of the specimens, on the outer side of the bottles
• Containers of the proper size are used according to the nature of specimen

EQUIPMENT

• Dry container
• Bed
• Sterile gauze
• Artery forceps
• K-Basin

Purpose of Specimen Collection:

1. Types of Specimens:
   • Blood: Commonly collected for laboratory testing to assess various health parameters.
   • Urine: Used for urinalysis to evaluate kidney function and detect certain medical conditions.
   • Saliva: Contains DNA and is often used in genetic testing.
   • Tissues: Biopsy samples are collected for histological examination to diagnose diseases like cancer.
   • Swabs: Used to collect samples from surfaces, body cavities, or wounds for microbiological analysis.
2. Collection Procedures:
   • Sterile Techniques: Depending on the type of specimen, sterile techniques may be necessary to prevent contamination.
   • Proper Containers: Specimens are collected in specific containers designed for the type of sample being obtained.
   • Labeling: Accurate and clear labeling of specimens is crucial to avoid errors in identification.
3. Transport and Storage:
   • Temperature Control: Some specimens require specific temperature conditions during transport and storage to maintain their integrity.
   • Timeliness: Specimens should be transported to the laboratory promptly to prevent degradation or alteration of the sample.
4. Chain of Custody:
   • Documentation: Maintaining a clear chain of custody ensures that the specimen’s handling and transportation are documented accurately, especially in legal and forensic contexts.
5. Safety Precautions:
   • Personal Protective Equipment (PPE): Healthcare providers and collectors should use appropriate PPE to prevent exposure to potentially infectious materials.
   • Disposal: Proper disposal methods for used collection materials and biohazardous waste are essential.
6. Patient/Donor Instructions:
   • Fasting or Preparation: Some tests may require patients to fast or follow specific instructions before specimen collection.

Follow YouTube – Nurseinfo Canestar