{"id":19581,"date":"2026-08-13T15:15:25","date_gmt":"2026-08-13T08:15:25","guid":{"rendered":"https:\/\/www.vietstock.org\/?p=19581"},"modified":"2026-08-11T15:31:44","modified_gmt":"2026-08-11T08:31:44","slug":"veterinary-sample-collection-procedure","status":"publish","type":"post","link":"https:\/\/www.vietstock.org\/en\/industry-news\/veterinary-sample-collection-procedure\/","title":{"rendered":"Veterinary Sample Collection Procedure: Sample Types, Tools, and Practical Notes"},"content":{"rendered":"

Collecting diagnostic specimens is the first and a very important step in the veterinary diagnostic chain. No matter how advanced a laboratory\u2019s equipment may be, results can still be inaccurate or lose diagnostic value if the wrong sample type is collected, the sample is taken at the wrong time, the volume is insufficient, or storage conditions are not appropriate.<\/span><\/p>\n

This article outlines a step-by-step veterinary sample collection procedure, including how to select the appropriate sample type, tools to prepare, blood collection techniques for livestock and poultry, and practical notes to help reduce errors in the field.<\/span><\/p>\n

Professional note:<\/b> The content below is for general reference only. It does not replace guidance from a veterinarian, the receiving laboratory, product labels, or current regulations. For suspected samples involving dangerous infectious diseases, notifiable diseases, or high-biosecurity-risk specimens, the person collecting the sample should contact the veterinary authority or competent laboratory before collection, packaging, and transport.<\/span><\/p>\n

Key Takeaways<\/b><\/h2>\n
    \n
  • Choosing the correct sample type based on the target agent and disease stage is a key factor affecting test accuracy.<\/span><\/li>\n
  • Common sample types include blood, visceral organs and tissues, secretions, swabs, and feces. Each type is suitable for different diagnostic objectives.<\/span><\/li>\n
  • Blood samples must be collected from the correct site, placed in the correct tube type, collected in sufficient volume according to test requirements, and stored properly immediately after collection.<\/span><\/li>\n
  • Parameters such as sample volume, storage temperature, transport time, transport medium, and anticoagulant type should follow the instructions of the receiving laboratory.<\/span><\/li>\n
  • Common field errors include collecting the wrong sample type, using non-sterile tools, incomplete labeling, pooling samples incorrectly, and transporting samples for too long.<\/span><\/li>\n<\/ul>\n

    Why Does Proper Sample Collection Determine the Accuracy of Veterinary Testing?<\/b><\/h2>\n
    \"Laboratory
    Proper veterinary sample collection and handling help preserve specimen quality and improve the reliability of diagnostic testing.<\/figcaption><\/figure>\n

    In veterinary diagnostics, the diagnostic specimen is the only input material that the laboratory can analyze.<\/span><\/p>\n

    If a sample is:<\/span><\/p>\n

      \n
    • cross-contaminated;<\/span><\/li>\n
    • decomposed;<\/span><\/li>\n
    • not representative of the actual disease situation;<\/span><\/li>\n
    • collected at the wrong time;<\/span><\/li>\n
    • insufficient in volume;<\/span><\/li>\n
    • stored under unsuitable conditions;<\/span><\/li>\n<\/ul>\n

      the test result may not reflect the true condition of the animal, even if the laboratory testing technique itself is performed correctly.<\/span><\/p>\n

      In livestock and poultry production, many diseases may present with similar clinical signs but require different control and treatment approaches. When sample quality is not adequate, veterinarians or technical managers may have difficulty assessing the disease cause and selecting an appropriate response.<\/span><\/p>\n

      Poor-quality samples may lead to:<\/span><\/p>\n

        \n
      • incorrect diagnosis;<\/span><\/li>\n
      • missed detection of the causative agent;<\/span><\/li>\n
      • impact on the veterinarian\u2019s professional decision-making;<\/span><\/li>\n
      • delayed disease control;<\/span><\/li>\n
      • repeated sampling;<\/span><\/li>\n
      • higher testing and labor costs.<\/span><\/li>\n<\/ul>\n

        Following sampling procedures according to biosafety guidance and laboratory requirements not only protects the accuracy of results but also helps:<\/span><\/p>\n

          \n
        • reduce exposure risk for the sampler;<\/span><\/li>\n
        • limit cross-infection between animals;<\/span><\/li>\n
        • ensure that samples arrive at the laboratory in a condition suitable for analysis;<\/span><\/li>\n
        • support information traceability during disease events.<\/span><\/li>\n<\/ul>\n

          Principles for Selecting the Correct Sample Type Based on Testing Objectives<\/b><\/h2>\n
          \"Laboratory
          Selecting representative animals and collecting specimens at the appropriate disease stage can improve the diagnostic value of veterinary samples.<\/figcaption><\/figure>\n

          Select Samples Based on the Suspected Agent and Testing Objective<\/b><\/h3>\n

          Each group of disease-causing agents has different biological characteristics, so sample type and storage conditions may also differ.<\/span><\/p>\n

          Viruses:<\/b>
          \n<\/b>Fresh tissue, secretions, swabs, or blood may be required at an appropriate disease stage. Samples may need to be kept chilled or stored under specific conditions to reduce the risk of viral inactivation. Exact conditions should follow the receiving laboratory\u2019s instructions.<\/span><\/p>\n

          Bacteria:<\/b>
          \n<\/b>Swabs, secretions, or tissue from typical lesions are often prioritized. Samples should not come into contact with disinfectants or antibiotics before collection because this may affect bacterial isolation.<\/span><\/p>\n

          Parasites:<\/b>
          \n<\/b>Feces, whole blood, or tissue may be used depending on the parasite type and testing objective. Fecal samples usually need to be tested soon or preserved in a suitable solution according to laboratory guidance.<\/span><\/p>\n

          Biochemistry, hematology, or physicochemical tests:<\/b>
          \n<\/b>These mainly use whole blood, plasma, or serum. Samples need sufficient volume and should be delivered to the laboratory under suitable conditions.<\/span><\/p>\n

          Clearly identifying the testing objective before sampling helps avoid:<\/span><\/p>\n

            \n
          • selecting the wrong sample type;<\/span><\/li>\n
          • using the wrong tube type;<\/span><\/li>\n
          • storing the sample under unsuitable conditions;<\/span><\/li>\n
          • having to collect samples again;<\/span><\/li>\n
          • delaying diagnosis.<\/span><\/li>\n<\/ul>\n

            Select Samples Based on Disease Stage and Animal Species<\/b><\/h3>\n

            Sampling time directly affects the ability to detect the causative agent.<\/span><\/p>\n

            Acute Stage<\/b><\/h4>\n

            This is often the appropriate time to:<\/span><\/p>\n

              \n
            • isolate viruses;<\/span><\/li>\n
            • isolate bacteria;<\/span><\/li>\n
            • detect antigens;<\/span><\/li>\n
            • perform certain molecular tests;<\/span><\/li>\n
            • collect blood, secretions, or swabs.<\/span><\/li>\n<\/ul>\n

              Animals at this stage have usually just developed disease, show clear signs, or have fever. However, the optimal sampling time still depends on the specific disease, test type, and laboratory instructions.<\/span><\/p>\n

              Recovery or Chronic Stage<\/b><\/h4>\n

              In many cases, the recovery or chronic stage may be more suitable for:<\/span><\/p>\n

                \n
              • antibody testing;<\/span><\/li>\n
              • serology;<\/span><\/li>\n
              • assessment of immune response after vaccination;<\/span><\/li>\n
              • determining whether animals have been exposed to a pathogen.<\/span><\/li>\n<\/ul>\n

                Dead Animals<\/b><\/h4>\n

                Samples should be collected as soon as possible after death, with priority given to visceral organs and tissues showing lesions.<\/span><\/p>\n

                Samples from animals that have been dead for too long are often:<\/span><\/p>\n

                  \n
                • decomposed;<\/span><\/li>\n
                • contaminated by secondary bacteria;<\/span><\/li>\n
                • reduced in diagnostic value;<\/span><\/li>\n
                • difficult for isolation of the original causative agent.<\/span><\/li>\n<\/ul>\n

                  Carcasses should not be left at ambient temperature for too long, especially in hot and humid conditions, because samples may decompose quickly and lose testing value. Specific timeframes should follow guidance from the veterinarian or receiving laboratory.<\/span><\/p>\n

                  Animal species also affects:<\/span><\/p>\n

                    \n
                  • sampling site;<\/span><\/li>\n
                  • suitable sample type;<\/span><\/li>\n
                  • sample volume;<\/span><\/li>\n
                  • needle size;<\/span><\/li>\n
                  • animal restraint method.<\/span><\/li>\n<\/ul>\n

                    Common Veterinary Diagnostic Sample Types and When to Collect Them<\/b><\/h2>\n
                    \"Laboratory
                    Veterinary blood samples may be used for hematology, biochemistry, serology and selected pathogen-detection tests depending on laboratory requirements.<\/figcaption><\/figure>\n

                    Blood Samples: Whole Blood and Serum<\/b><\/h3>\n

                    Blood is one of the most commonly used diagnostic specimens in veterinary medicine and can serve many purposes, such as:<\/span><\/p>\n

                      \n
                    • hematology testing;<\/span><\/li>\n
                    • biochemistry testing;<\/span><\/li>\n
                    • antigen detection;<\/span><\/li>\n
                    • detection of certain blood-borne agents;<\/span><\/li>\n
                    • antibody testing;<\/span><\/li>\n
                    • immune status assessment;<\/span><\/li>\n
                    • monitoring professional responses as indicated by a veterinarian.<\/span><\/li>\n<\/ul>\n

                      Depending on the testing objective, the sample may be:<\/span><\/p>\n

                      Whole blood:<\/b>
                      \n<\/b>Blood with cells retained, often used for hematology or some molecular tests when requested by the laboratory.<\/span><\/p>\n

                      Serum:<\/b>
                      \n<\/b>The liquid portion obtained after blood has clotted and been separated, often used for serology or biochemistry.<\/span><\/p>\n

                      Plasma:<\/b>
                      \n<\/b>The liquid portion of anticoagulated blood, used in certain specialized tests.<\/span><\/p>\n

                      Blood collection and handling techniques are described in detail in a later section.<\/span><\/p>\n

                      Visceral Organ and Tissue Samples: Liver, Spleen, Lymph Nodes, Lungs, and Intestines<\/b><\/h3>\n

                      Visceral organ and tissue samples are usually collected from dead animals or animals undergoing necropsy for lesion-based diagnosis.<\/span><\/p>\n

                      Commonly sampled organs include:<\/span><\/p>\n

                      Liver:<\/b>
                      \n<\/b>May be collected in certain systemic diseases, diseases with liver lesions, or when requested by the laboratory.<\/span><\/p>\n

                      Spleen:<\/b>
                      \n<\/b>May be useful in certain systemic infections or diseases involving the immune system.<\/span><\/p>\n

                      Lymph nodes:<\/b>
                      \n<\/b>Support assessment of immune response and certain specific diseases.<\/span><\/p>\n

                      Lungs:<\/b>
                      \n<\/b>Used for diagnosing respiratory disease, pneumonia, or diseases with respiratory tract lesions.<\/span><\/p>\n

                      Intestines:<\/b>
                      \n<\/b>Used for digestive diseases, enteritis, diarrhea, or diseases with intestinal lesions.<\/span><\/p>\n

                      Kidneys:<\/b>
                      \n<\/b>May be needed in some systemic diseases, metabolic diseases, or suspected poisoning cases.<\/span><\/p>\n

                      Brain:<\/b>
                      \n<\/b>May be used for neurological diseases or diseases suspected to involve specific agents. Brain sampling should be performed by trained personnel, with suitable protective equipment and biosafety conditions.<\/span><\/p>\n

                      Each tissue sample should be taken from:<\/span><\/p>\n

                        \n
                      • areas with clear lesions;<\/span><\/li>\n
                      • the boundary between diseased tissue and normal tissue;<\/span><\/li>\n
                      • areas that have not decomposed;<\/span><\/li>\n
                      • areas not contaminated by intestinal contents or the environment.<\/span><\/li>\n<\/ul>\n

                        The tissue sample size should be sufficient to represent the lesion and meet laboratory requirements. Some laboratories may request samples of a few centimeters or a few grams, but this should be confirmed before collection.<\/span><\/p>\n

                        For samples used for bacterial or viral isolation:<\/span><\/p>\n

                          \n
                        • place them in sterile bags or containers;<\/span><\/li>\n
                        • keep them chilled according to laboratory guidance;<\/span><\/li>\n
                        • do not immerse them in formalin;<\/span><\/li>\n
                        • do not freeze them on your own if live-agent isolation is needed, unless the laboratory instructs otherwise.<\/span><\/li>\n<\/ul>\n

                          For histology or pathology samples:<\/span><\/p>\n

                            \n
                          • samples may be fixed in 10% neutral buffered formalin according to laboratory guidance;<\/span><\/li>\n
                          • the amount of formalin should be sufficient to fully cover the sample;<\/span><\/li>\n
                          • samples should not be too thick, so the fixative can penetrate evenly;<\/span><\/li>\n
                          • samples fixed in formalin should not be used for bacterial isolation, viral isolation, or certain molecular tests unless requested by the laboratory.<\/span><\/li>\n<\/ul>\n

                            Secretions and Swab Samples<\/b><\/h3>\n

                            Swabs and secretion samples are often suitable for diagnosing respiratory, digestive, and contact-transmitted diseases.<\/span><\/p>\n

                            Common types include:<\/span><\/p>\n

                            Oropharyngeal swab:<\/b>
                            \n<\/b>May be used for certain respiratory diseases in pigs and poultry.<\/span><\/p>\n

                            Nasal swab:<\/b>
                            \n<\/b>Used to detect certain respiratory agents.<\/span><\/p>\n

                            Cloacal swab:<\/b>
                            \n<\/b>Suitable for poultry in certain tests for gastrointestinal or respiratory viruses.<\/span><\/p>\n

                            Rectal swab:<\/b>
                            \n<\/b>May be used for certain intestinal diseases.<\/span><\/p>\n

                            Joint fluid:<\/b>
                            \n<\/b>Supports diagnosis in certain cases of bacterial arthritis.<\/span><\/p>\n

                            Tracheal fluid:<\/b>
                            \n<\/b>Used in certain respiratory diseases.<\/span><\/p>\n

                            Vesicular fluid or lesion material:<\/b>
                            \n<\/b>Used for diseases with characteristic skin or mucosal lesions. If a dangerous infectious disease or notifiable disease is suspected, the veterinary authority or competent laboratory should be contacted before sampling.<\/span><\/p>\n

                            After collection, swabs should be:<\/span><\/p>\n

                              \n
                            • placed immediately into a suitable transport medium;<\/span><\/li>\n
                            • sealed tightly;<\/span><\/li>\n
                            • labeled;<\/span><\/li>\n
                            • kept chilled if required by the laboratory;<\/span><\/li>\n
                            • transported within the timeframe required by the laboratory.<\/span><\/li>\n<\/ul>\n

                              For many viral tests, samples need to be transferred as soon as possible under appropriate conditions. Transport time may vary depending on the agent, sample type, transport medium, and laboratory guidance.<\/span><\/p>\n

                              Fecal Samples<\/b><\/h3>\n

                              Fecal samples are used to detect:<\/span><\/p>\n