General Specimen Submission Guidelines
Accurate laboratory results are entirely dependent on the quality of the specimen received. To ensure diagnostic integrity and patient safety, all healthcare providers must adhere to standardized specimen collection, labeling, and transportation protocols. Failure to follow these guidelines may result in specimen rejection or compromised test accuracy.
1. Patient Identification and Labeling
Correct identification is the most critical step in the pre-analytical process. Every specimen must be accompanied by accurate information to prevent errors.
- Patient Identifiers: Each specimen container must be labeled with the patients full legal name and a unique identification number (e.g., date of birth or hospital record number).
- Collection Details: Clearly indicate the date and time of collection, as well as the specific anatomic site (e.g., "Left arm," "Throat swab").
- Legibility: Labels must be printed or written clearly in indelible ink. Labels should be applied to the container, not the lid.
2. Proper Collection Technique
The method of collection varies significantly by specimen type. Always utilize the specific collection kits provided by the laboratory to ensure chemical compatibility with the testing equipment.
- Use sterile, leak-proof containers for all fluid samples.
- Maintain aseptic technique to prevent contamination, especially for blood cultures or microbiological swabs.
- Fill tubes to the indicated volume to ensure the correct ratio of preservative/anticoagulant to blood.
3. Specimen Handling and Storage
Many analytes are unstable and sensitive to temperature, light, or prolonged storage. Before submission, verify the required storage conditions:
- Refrigeration: Required for most urine and liquid samples to inhibit bacterial growth.
- Room Temperature: Essential for certain microbiology samples (e.g., blood cultures) which may be harmed by cooling.
- Frozen Samples: Required for specific clinical chemistry tests to prevent enzymatic degradation.
- Light Sensitivity: Some specimens must be wrapped in foil or placed in amber containers to prevent degradation due to UV exposure.
4. Transportation and Logistics
Timely transport is essential for clinical validity. Samples should be transported in secondary biohazard bags that include an absorbent material to contain spills.
- Ensure all lids are tightened securely to prevent leakage during transit.
- Ship specimens in a timely manner. Delays in transit can render a specimen "QNS" (Quantity Not Sufficient) or "Expired" due to cellular degradation.
- When shipping via courier, use appropriate cold packs or dry ice as required by the specific test protocol.
5. Common Reasons for Specimen Rejection
The laboratory reserves the right to reject specimens that do not meet quality standards. Common reasons include:
- Unlabeled or mislabeled containers.
- Mismatched information between the requisition form and the specimen label.
- Specimen collected in the incorrect tube type (e.g., using a clot activator for a coagulation test).
- Evidence of hemolysis or lipemia that interferes with diagnostic instrumentation.
- Samples submitted in leaking containers or those contaminated on the exterior.
6. Requisition Forms
A complete requisition form must accompany every specimen. It should include the ordering physician's name, the clinical diagnosis or ICD-10 code, the specific tests requested, and the patient's insurance or billing information.
By following these general guidelines, healthcare professionals contribute to efficient laboratory operations and, more importantly, ensure that patients receive the most accurate and timely medical care possible.
