Overview
Numerous histological specimens arrive in the laboratory throughout the day. Without a systematic, disciplined approach to receiving them, samples can be misplaced, mislabelled, or lost — with serious consequences for patient care. This lesson covers the exact checks required at the point of specimen receipt and how a gross room should be prepared and equipped.
Correct specimen accessioning is the very first — and one of the most critical — steps in the entire histopathology workflow, since every subsequent step (fixation, processing, sectioning, staining, diagnosis) depends on a correctly identified and tracked sample.
Learning Objectives
After this lesson you will be able to…- Explain the process of receiving surgical specimens in the laboratory
- List the points that must be checked and matched between the requisition form and the specimen label
- Describe how to assign and use an accession number
- Explain the purpose and contents of a specimen receiving register
- Describe the preparation and essential equipment of a gross room
- Understand the importance of timely fixation to prevent autolysis
Clinical Story
Why This MattersA cervical lymph node biopsy from a 25-year-old man named Akash arrives at the histopathology lab in a container of 10% formalin. Before anyone even thinks about grossing or processing the specimen, the receiving technologist must first confirm that the name, age, sex, and registration number on the request form exactly match the label on the container, assign the correct accession number, and log every detail in the receiving register — because a single transcription error at this stage could result in the wrong diagnosis being attached to the wrong patient.
Core Concepts
At the time of receiving a specimen, the following points must be checked and must match between the requisition form and the label on the sample container: (1) name of the patient, (2) sex and age of patient, (3) registration number, OPD or indoor number, and (4) type of sample (e.g. appendix or lymph node). Only after these points are carefully matched should an accession number from the Histopathology laboratory be assigned to both the requisition form and the sample container.
A register must be maintained for record-keeping and future reference. It should record: date; accession number; patient's name, age and sex; patient's registration/OPD/indoor number; type of sample; number of samples received from one patient; and remarks/final diagnosis (entered later). After receiving the samples, the consultant should be informed for grossing; if grossing is delayed, fixative must be added to all samples to prevent autolysis.
The gross room's size and features depend on specimen volume and institution type, but it should always be well illuminated and ventilated, with a gross station and racks to keep specimens in accession-number order. A proper gross station has a ventilated hood, a cutting board over a metal box draining fluids to a sink, ready access to hot and cold water, stock and 10% buffered formalin, a full instrument set (scissors, forceps, malleable probe, scalpel with disposable blades, long knife, scale, pins), containers with different fixatives, a bone cutter, a large disposal bin, and cassettes with labels. Optional extras include photographic facility, refrigerator, weighing balance, X-ray view box, and tissue bank equipment.
Laboratory Principle
Specimen identification integrity relies on a chain of matching checks — patient details on the requisition form must correspond exactly to the label on the specimen container before an accession number is assigned. This accession number then becomes the single unique identifier that tracks the specimen through every subsequent step: grossing, fixation, processing, embedding, sectioning, staining, and final reporting.
Equipment Required
Reagents & Materials
| Reagent / Material | Concentration / Grade | Purpose | Storage |
|---|---|---|---|
| 10% Formalin | 10% buffered or unbuffered | Fixative added if grossing is delayed, to prevent autolysis | Room temperature, well-ventilated area |
| Stock formalin (concentrated) | ~37–40% formaldehyde stock | Preparing working formalin solutions | Cool, ventilated storage, away from heat |
| India ink / graphite pencil | N/A | Marking margins or orientation on specimens/labels | Room temperature |
Step-by-Step Procedure
Check that the specimen container matches the accompanying requisition form on arrival.
Confirm name, sex, age, registration/OPD/indoor number, and type of sample match exactly between form and label.
Generate the Histopathology laboratory accession number and write it on both the requisition form and the specimen container.
Record date, accession number, patient details, registration number, specimen type, and number of samples received.
Inform the pathologist/consultant that the specimen is ready for gross examination.
If grossing cannot occur immediately, ensure the specimen is adequately covered in fixative to prevent autolysis.
Flow Diagram
Quality Control
Two-person verification of patient identifiers at the point of receipt (name, age/sex, registration number, specimen type) significantly reduces mislabelling errors. Discrepancies between the form and label must be resolved with the submitting clinician before accessioning proceeds.
Laboratories should participate in specimen identification and pre-analytical error monitoring programs, and periodically audit receiving register completeness and accuracy as part of accreditation requirements.
Reference Values
Key Parameters⚠️ Reference ranges may vary between laboratories. Always apply your laboratory's established reference intervals and SOPs.
Clinical Interpretation
| Finding | Possible Significance | Action / Follow-up |
|---|---|---|
| Name/registration mismatch between form and container | Risk of specimen mix-up or wrong-patient reporting | Halt accessioning; contact submitting ward/clinician to resolve before proceeding |
| Specimen received dry (no fixative) | Risk of autolysis and tissue degradation before fixation | Immerse immediately in adequate volume of fixative |
| Multiple specimens from one patient not individually labelled | Risk of confusing anatomical sites or specimen parts | Request separate, clearly labelled containers per site before accessioning |
Common Errors & How to Avoid Them
Cause: Mismatched patient information can permanently link a diagnosis to the wrong patient record.
Prevention: Always complete the 4-point identity check (name, age/sex, registration number, specimen type) before assigning any accession number.
Cause: Specimens left without adequate fixative undergo autolysis, degrading tissue morphology and antigenicity.
Prevention: Add sufficient fixative immediately if grossing will not occur right away; ensure the specimen is fully submerged.
Cause: Missing fields make it impossible to trace a specimen's history if a discrepancy or query later arises.
Prevention: Complete every register field (date, accession number, patient details, sample type, remarks) at the time of receipt, not later from memory.
Laboratory Tips from the Bench
Never accept a specimen with an illegible or missing label — always return it to the submitting department for correct labelling before accessioning, rather than guessing patient identity.
Keep the gross room racks organised strictly in accession-number order; this dramatically speeds up retrieval when a pathologist needs to review a specimen urgently.
Remember the 4 identity checkpoints with 'NAST' — Name, Age/sex, Sample type, and reg. number/Token — all four must match before an accession number is given.
Important Notes
Any delay between specimen removal and fixation risks autolysis; if grossing cannot happen immediately, always add adequate fixative volume to protect tissue morphology.
Once assigned, the accession number becomes the single reference used at every subsequent stage — grossing, processing, embedding, sectioning, and reporting — so accuracy at this step is non-negotiable.
Interactive Quiz
Test Your KnowledgeFlashcards
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Clinical Case Study
Apply Your KnowledgeA fallopian tube specimen from Divya, 30 years, F, registration number 20049, arrives at the histopathology laboratory in a labelled container with an accompanying requisition form.
All four identity checkpoints match exactly between the requisition form and the container label, so the specimen can be safely assigned accession number 02/2013 and logged in the receiving register without further verification.
- →A complete identity match across all four checkpoints allows safe accessioning
- →Documentation in the receiving register should occur immediately after accessioning
- →Consistent accessioning practice protects both patient safety and diagnostic accuracy
Frequently Asked Questions
The receiving technologist should immediately add an adequate volume of appropriate fixative (usually 10% buffered formalin, at least ten times the specimen volume) to prevent autolysis, and should note the delay in the register.
No — each distinct specimen or anatomical site should typically be accessioned and tracked separately, even if received from the same patient on the same day, unless institutional policy specifically allows grouped numbering for multi-part specimens.
The receiving laboratory staff should not resolve discrepancies unilaterally; they must contact the submitting ward or clinician to confirm correct patient identity before accessioning proceeds.
Quick Revision
10-Minute ReviewKey Takeaways
- Specimen receiving is the critical first step that safeguards patient identification throughout the diagnostic pathway.
- Four checkpoints — name, age/sex, registration number, specimen type — must match before an accession number is issued.
- The receiving register provides a complete, traceable record of every specimen's journey.
- A well-organised gross room with proper ventilation, instruments and fixatives supports safe and efficient specimen handling.
- Prompt fixation after receipt prevents autolysis and preserves diagnostic morphology.
- Discrepancies in patient identifiers must always be resolved with the clinical team before accessioning.
Competency Checklist
Track Your MasteryReferences
- Bancroft JD, Layton C. Theory and Practice of Histological Techniques. 8th ed.
- College of American Pathologists (CAP) — Anatomic Pathology Checklist, Specimen Accessioning.
- NIOS Vocational Course — Histology and Cytology Module, Lesson 4: Receiving of Surgical Specimens.