If you've been told your pathology lab needs to "go digital," you've probably also been handed a confusing pile of acronyms — PACS, WSI, DICOM, LIMS, HL7, VNA — and a budget number that feels both too high and too vague. This guide cuts through that. It walks through every component of a working digital pathology lab, what each one actually does for your pathologists, what it costs in rough terms, and the order to buy things in so you don't waste money on systems you can't yet use.

What "digital pathology" really means

A traditional pathology lab handles physical objects: cassettes, slides, glass under microscopes, paper requisitions. Going digital means three things at once: capturing those physical objects as images, storing those images in a way pathologists can retrieve later, and giving the pathologists tools to read and report on them — ideally from anywhere.

That is the entire goal. Every product in this space exists to serve one of those three jobs. Once you can name which job a product does, the catalog gets a lot less intimidating.

The five components of a digital pathology stack

1. Image capture — the scanners

Whole-slide imaging (WSI) scanners are robotic microscopes that take a glass slide and produce a high-resolution digital image — typically a multi-gigapixel pyramid file. The pathologist can then read that image on a screen instead of through an eyepiece. Throughput varies enormously (anything from 20 to 400+ slides per day per scanner) and so does price.

Macro imaging units are simpler: a camera over the grossing bench that captures specimens before they're processed. These are cheap and high-leverage — a pathologist reading remotely can see what the gross specimen looked like without anyone walking glass between rooms.

You don't need both immediately. Many labs start with macro imaging because the cost and disruption are low, then add WSI once the rest of the stack can store and display the images.

2. Storage — PACS

PACS stands for Picture Archiving and Communication System. In plain terms it is a server (on-prem or hosted) that stores your medical images and makes them retrievable by case number, patient ID, or date. It's the warehouse.

PACS originally came from radiology, and most pathology PACS systems use the same standard — DICOM — to talk to scanners and viewers. The practical implication: if everything you buy speaks DICOM, your storage layer is replaceable later. If something requires a proprietary file format or vendor-locked viewer, you have a problem the day you want to switch.

3. Display — the viewer

The viewer is the application your pathologists actually open to read cases. It needs to render gigapixel WSI images smoothly, support annotations and measurements, integrate with your case-reporting workflow, and — increasingly — work from outside the lab. A good viewer is the single component that has the biggest day-to-day impact on pathologist satisfaction. A bad one wastes their time on every case.

Some scanners come bundled with a viewer. Sometimes that's enough; often it isn't, especially if you have scanners from more than one vendor.

4. Workflow — the LIMS integration

Your LIMS (Laboratory Information Management System) is where the case actually lives administratively: which specimen belongs to which patient, what tests were ordered, who reported it, and what the final diagnosis was. The images live in PACS. The case lives in LIMS. Connecting the two is what makes the system actually usable.

In practice this means: the LIMS knows which slides belong to a case and passes that to the viewer when a pathologist opens it; barcode scanners on the grossing bench and at the scanner link physical objects to the digital case; finalized reports flow back into LIMS. Done well, the pathologist doesn't notice the seam. Done poorly, they spend half their day copying case numbers between two browser tabs.

Most projects underestimate this integration. It is where digital pathology projects either become a productivity win or a productivity tax.

5. Tracking — labels and sample tracking

Every physical object — cassette, block, slide — gets a barcode label. Chemical-resistant printers survive the formalin, xylene and stain baths. A sample tracking layer logs each scan: when a slide was sectioned, when it reached the scanner, when it was filed.

This sounds boring. It is the single biggest reduction in "lost slide" incidents you will ever buy, and it pays for itself in clinical risk reduction alone. If you do nothing else from this guide, do this.

The order to buy things in

Pathology lab digitization fails most often when labs buy a scanner first and then discover they have nowhere to send the images, no viewer their pathologists like, and no way to connect either to the case in LIMS. A more reliable order:

1. Sample tracking and label printing. Lowest cost, immediate clinical-safety win, no dependencies. Start here.
2. LIMS integration plan. Before you buy any imaging hardware, know how it will plug into the case in LIMS. This is a design exercise, not a purchase.
3. Macro imaging. Cheap, fast to install, immediate value for remote pathologists, exercises the integration without huge files.
4. PACS / storage. Stand up the storage layer once you know what is going into it. Pick something that speaks DICOM and that you can grow.
5. Viewer. Pick the viewer pathologists like, not the one the scanner vendor bundles by default. They have to live in it.
6. WSI scanner(s). Once the rest of the stack works, the scanner is just adding throughput.

Rough cost ranges

Concrete numbers depend on country, throughput, and how much existing infrastructure you can reuse. Order-of-magnitude:

• Label printing + sample tracking: low five figures (€)
• Macro imaging unit, installed and integrated: low-to-mid five figures
• PACS / storage layer: mid-five to low-six figures, depending on capacity and redundancy
• WSI scanner: mid-five to low-six figures per scanner, depending on throughput
• Viewer and LIMS integration work: five figures, mostly labour

A small private lab can reasonably reach a working digital pipeline for low six figures total. A full hospital-grade build with multiple scanners and high-availability storage runs higher. The integration work usually costs less than the hardware but matters more than the hardware.

The questions worth asking your vendor

• Does every component speak DICOM and HL7/FHIR, or are any of them proprietary?
• Where will the patient data physically live, and under whose control?
• What happens if I want to swap one of these components in three years?
• Who answers the phone on a Saturday when the scanner stops responding?
• Can I see this exact configuration running in another lab?

What we do

At Medired we design, install and support the full digital pathology stack — from sample tracking up to WSI scanners and remote-viewing platforms — for labs across the EU. We are vendor-neutral, we use open standards, and the engineer who designs your system is the one who installs and supports it. If you want to talk about your specific lab, we are happy to do a free assessment call.