Grossing is where a specimen becomes a set of cassettes, and anything missed, mislabeled or poorly sampled at the bench cannot be fixed later under the microscope. This article collects grossing best practices for pathologists, pathologists' assistants and residents, along with the lab managers who design the grossing room.
None of this replaces your institutional protocols or specialty guidelines. It focuses on the habits and setup that make those protocols work consistently on a busy day.
Grossing best practices begin with a clean bench
The single most effective control at the grossing bench is to have only one specimen open at a time. That sounds obvious, but in practice benches fill up: a container waiting for photos, a cassette rack from the previous case, a specimen soaking in fixative.
- Clear the cutting board, instruments and cassette tray between cases.
- Rinse or replace blades and forceps to prevent tissue carryover.
- Keep only the current case's containers and cassettes within reach.
- Print cassettes on demand for the case open on screen instead of picking from a pre-printed pile.
Carryover, where a fragment from one patient ends up in another's cassette, is one of the hardest errors to detect later. A clean bench is the cheapest prevention.
Confirm identity before the first cut
Before opening any container, compare the container label with the requisition and the case on screen. Check the number of containers and parts, the site and laterality, and the procedure. If anything does not match, stop and resolve it before cutting.
Barcode scanning at the grossing station turns this check from a visual comparison into a positive confirmation. If you are planning scan points across the lab, see specimen tracking with barcodes for where the grossing scan fits.
Respect fixation
Fixation quality affects morphology, immunohistochemistry and molecular testing. Grossing decisions influence it directly.
Before grossing
Specimens should arrive in an adequate volume of fixative; a commonly recommended ratio is about ten parts fixative to one part tissue. Record the time the specimen was placed in fixative when it is available, because guidelines for some biomarker tests, such as breast cancer biomarkers, set limits on time to fixation and fixation duration.
During grossing
Large specimens need to be opened or sliced so fixative can penetrate. Hollow organs are opened, solid organs are serially sectioned, and thick tissue is cut to a size that fits the cassette without packing. Overstuffed cassettes process poorly and give the histology team trouble at embedding.
Describe and sample systematically
A good gross description lets another pathologist picture the specimen without seeing it. Consistency matters more than eloquence.
- Identify the specimen: label, container contents, fixative and how it was received.
- Measure the specimen and relevant structures in three dimensions where appropriate.
- Orient using sutures, clips or clinical markers, and document how orientation was determined.
- Ink margins according to your protocol and record the color code.
- Describe lesions: size, color, consistency, relationship to margins and adjacent structures.
- Sample according to the specimen protocol, and record what each cassette contains.
The block key, the list linking each cassette to a specific region, is the bridge between grossing and microscopy. A vague block key such as tumor, multiple sections forces the pathologist to guess where a positive margin came from.
Templates help, within limits
Grossing templates for common specimen types reduce omissions, especially for residents and new staff, and they line up well with structured cancer reports; see synoptic reporting explained. The risk is copying a template without describing what is actually there. Train staff to treat templates as a checklist of what to look for, not as text to accept.
Dictation and documentation at the bench
Grossing produces a lot of description while both hands are gloved and busy. Voice dictation, either to a transcriptionist or directly into the system, is common for good reason. A few habits make it more reliable:
- Dictate as you go rather than from memory at the end of the case.
- State the accession number and part at the start of each dictation.
- Read back or review the final text before the case leaves the bench.
- Photograph complex specimens, with a label and scale in view, and attach the images to the case.
If a transcriptionist types later, build in a check that gross descriptions are completed before slides reach the pathologist, so nobody signs out without the full picture.
Safety, supervision and quality checks
A well-run grossing room protects staff as well as specimens, and it builds competence deliberately.
Safety in the grossing room
Formaldehyde is classified as a human carcinogen, and the grossing room combines chemical, sharps and biological hazards. Work under adequate ventilation such as a downdraft or ventilated grossing station, wear appropriate personal protective equipment, and follow your institution's exposure monitoring program. Unfixed tissue from patients with known or suspected infections needs additional precautions defined in your biosafety policy.
Fatigue is a safety issue too. Long, uninterrupted grossing sessions increase the chance of both injuries and identification errors, so plan breaks into the schedule.
Supervision, training and quality checks
Grossing is often delegated to residents or pathologists' assistants, which makes supervision and competency assessment essential. Define which specimen types each person may gross independently, and review that list as they gain experience.
Useful quality checks include periodic review of gross descriptions against the final diagnosis, tracking how often additional sampling is needed after microscopy, and following up any identification near misses. Treat additional sampling requests as learning data rather than blame.
Common mistakes
- Several open cases on one bench.
- Pre-printed cassettes picked from a stack.
- Packing too much tissue into a cassette.
- Block keys that do not specify location.
- Templates accepted without checking they match the specimen.
- Gross descriptions completed long after the cassettes have gone to processing.
Key takeaways
- One case at a time on a clean bench is the most effective grossing control.
- Confirm identity against the requisition before the first cut, ideally with a scan.
- Grossing decisions directly affect fixation and downstream testing.
- A specific block key is the link between the gross room and the microscope.
- Use templates as checklists and dictate as you go.
PATHOLOGY+ includes a grossing workstation with on-demand cassette printing, templates and voice dictation tied to the case on screen. To see it with your own specimen types, book a demo.