Pathology EHR

How is a pathology EHR different from an LIS?

A pathology EHR is the patient-facing record of pathology results, while the anatomic pathology LIS runs the lab's internal work: accessioning specimens, tracking blocks and slides, and supporting sign-out. The two connect through order and result interfaces, so a pathology report written in the LIS appears correctly in the clinician's chart.

Clinical pathology, meaning chemistry, hematology and microbiology, produces numeric results that map neatly to discrete fields. Anatomic pathology produces narrative diagnoses, gross descriptions, images and, for many cancers, structured synoptic data, which is harder to move intact.

Independent pathology groups often need a third piece: a practice system for billing, scheduling and client portals, because their clients are the clinics and hospitals that send specimens rather than patients who walk in.

How does an anatomic pathology case move through the lab?

An anatomic pathology case moves through a fixed chain of custody, from the container that arrives at the lab to the signed report. Each step creates an identifier the next step depends on.

• 1. Order and requisition: the clinician's EHR sends an order, ideally as an HL7 v2 message, with patient identifiers, the specimen source, clinical history and the ordering provider.
• 2. Accessioning: the lab assigns a case number and labels each specimen part, such as part A and part B, matching every container to the requisition.
• 3. Grossing: the pathologist or pathologists' assistant describes each specimen and submits tissue into cassettes, each with its own block identifier.
• 4. Histology: blocks are processed, cut and stained, producing slides that carry the case, part, block and level on a barcode label.
• 5. Ancillary studies: special stains and immunohistochemistry are ordered against specific blocks, and their results return to the same case.
• 6. Sign-out: the pathologist reviews the slides, writes the diagnosis and signs the report, which the LIS sends back to the ordering EHR.
• 7. Amendments and addenda: later findings, such as a molecular result, arrive as addenda, and corrections are issued as amended reports linked to the original.

Barcode labels at every level are the main defense against mix-ups. When the case, part and block identifiers travel together from cassette to slide to image, a mislabeled slide can be detected by a scan rather than by a pathologist noticing the tissue does not match the history.

The order step deserves the most attention in an integration project. Every requisition that arrives on paper or by fax is retyped at accessioning, and retyping is where patient and specimen errors begin. An electronic order from each referring client, even a simple one, removes that step and gives the lab the identifiers it needs to send the result back.

What does CLIA require of reports and retention?

CLIA sets what a lab report must contain and how long the lab keeps its records. Under 42 CFR 493.1105, pathology test reports and histopathology slides must be kept for at least 10 years and specimen blocks for at least 2 years.

• Report contents: each report identifies the patient, the testing laboratory and its address, the report date, the test, where the specimen came from when that matters, and the result with any interpretation.
• Corrected reports: when an error is found, the lab notifies the ordering provider promptly, issues a corrected report and keeps both the original and the correction.
• Patient access: labs may release completed reports to patients or their representatives on request, after confirming identity, so a portal feed needs identity checks built in.
• Archive design: retention clocks run from the report or examination date, so the archive needs those dates indexed for every case, slide and block.

The corrected report rule shapes interface design. An amended report must replace the preliminary version in the receiving EHR without deleting it, which in HL7 v2 terms usually means sending a corrected result status and keeping the same order and filler identifiers so the EHR files it against the right case.

Retention has a practical side for digital archives as well. A lab that scans slides still keeps the glass and the blocks for the required periods, so the image archive is an addition to the physical slide file, not a replacement for it.

Synoptic reporting with CAP cancer protocols

For cancer resections, the College of American Pathologists publishes cancer protocols that list required data elements, such as tumor size, margins and lymph node status. CAP accreditation expects those elements in synoptic format in at least 90 percent of reports from definitive primary cancer resections.

• Which specimens: the requirement covers definitive resections, not biopsies, cytology or metastatic tumors, so the LIS needs to know which cases qualify.
• Layout: each element is followed by its answer, and the synoptic section sits together in one place, clearly separate from the narrative.
• Electronic checklists: CAP licenses electronic versions of its protocols that many anatomic pathology LIS vendors build into sign-out screens.
• Self-audit: a regular report of qualifying cases missing required elements lets the lab fix gaps before an inspection.

Synoptic data is only valuable downstream if it stays discrete. When the LIS flattens the checklist into report text, the receiving EHR, the tumor registry and any research database each have to parse it back out, so it is worth confirming that the interface sends the data elements as coded values alongside the formatted report.

Protocol versions change over time. The case should record which protocol version was used at sign-out, so a registry or researcher reading the data years later knows which questions and answer lists applied.

Where does whole slide imaging fit?

Whole slide imaging scans a glass slide into a high-resolution digital image that a pathologist can review on screen. FDA regulates these systems as Class II devices under 21 CFR 864.3700, and it granted the first one for primary diagnosis, the Philips IntelliSite Pathology Solution, through the De Novo pathway in April 2017.

Each authorized system comes with its own indications, such as the specimen types and the scanner, viewer and display combination it was tested with. The first system's scope, for example, excluded frozen sections and cytology. Using a different combination or specimen type for primary diagnosis can fall outside what was authorized.

• Lab validation: the lab still validates digital review in its own setting, with its own staff and case mix, before using it for sign-out.
• Image format: DICOM supports whole slide images, while many scanners also write their own formats, so the archive decision affects which viewers can open the images later.
• Case linking: the image carries the case, part, block and stain identifiers from the slide label so it opens in the right case.
• Storage: whole slide images are large, so retention, tiering and retrieval speed need a plan before scanning starts at volume.
• Fallback: pathologists keep access to glass when an image is out of focus or tissue is missed in the scan.

How do specimens become claims?

Surgical pathology is generally billed by specimen, so the LIS has to count specimens the same way the payer does. Stains and other ancillary studies have their own counting rules, often by stain or by block.

These rules map directly onto the case model. If the LIS records parts, blocks and stains as separate objects with the requisition's specimen labels, the billing logic can count units correctly. If grossing staff merge or split parts without recording why, the claim and the report stop agreeing.

• Part reasons: when grossing splits or combines containers, the LIS asks for a reason and records it with the case.
• Stain orders: each stain is ordered against a block, so the count and the clinical record come from the same data.
• Charge review: a pre-billing view shows parts, blocks and stains per case so coders check them before the claim goes out.
• Client billing: for referred work, the record shows whether the lab bills the payer, the patient or the referring client.

Pathology integration risks to plan for

• Orders by fax or paper: requisitions retyped at accessioning are where patient and specimen errors begin.
• Amended reports that overwrite: the receiving EHR loses the preliminary version the lab must keep.
• Synoptic data as text only: registries and analytics have to parse narrative to recover tumor data.
• Images without identifiers: scanned slides that carry only a file name cannot be reliably attached to the case.
• Off-label digital sign-out: a scanner, viewer or display outside the authorized configuration is used for primary diagnosis.
• Part counts that drift: specimen splits at grossing are not reflected in the billing count.

Teams that avoid these usually test interfaces with real case types, including multi-part resections, addenda and amended reports, rather than single-specimen happy paths.

How Agnotic can help

Pathology integration work sits between a specialized LIS and many clinical systems that order from it. Agnotic Technologies engineers that middle ground for the client: electronic order intake, result and amended report interfaces, discrete synoptic data feeds, slide image linking and the case data model that keeps reports and claims consistent.

Agnotic works with the lab's chosen LIS and the clients' EHRs through their supported interfaces, so the lab keeps its validated workflow while its results arrive in the chart as usable data.

Sources

• 42 CFR 493.1105: Standard, retention requirements
• College of American Pathologists: Cancer protocol frequently asked questions
• FDA De Novo decision summary DEN160056: Philips IntelliSite Pathology Solution