Analyser integration: what 'integrated' should mean in a pathology lab

In most Indian pathology labs a haematology analyser prints a slip, and someone types twenty numbers from the slip into the report. A three-part differential CBC has around twenty parameters. At eighty patients a day that is sixteen hundred keystrokes of pure transcription, each one an opportunity to swap a 7 for a 1. Analyser integration exists to delete that job. This article explains what the phrase covers, because vendors use it loosely.

Two protocols, one job

Lab machines speak one of two dialects. ASTM E1394 is the older standard, still used by a large number of biochemistry and haematology analysers, and it runs over a serial cable or a serial-to-network adapter. HL7 version 2 is the newer one and runs over TCP/IP. The two are different on the wire but carry the same information: which sample, which test, what result, which unit, which flags.

A LIMS that claims integration should speak both, because a lab rarely gets to choose which one its machines use. Pathixio does; a five-year-old Mindray on ASTM and a new Sysmex on HL7 can feed the same report.

Unidirectional versus bidirectional

The distinction matters more than the protocol.

• Unidirectional: the analyser sends results to the LIMS. The technician still keys the sample ID and the test list into the machine by hand.
• Bidirectional: the LIMS also sends the work order to the analyser. The technician scans a barcode, the machine looks up which tests to run, and the results come back attached to the right sample.

Bidirectional is what removes the last manual step and the last source of sample mix-ups. When a vendor says 'integrated', ask which direction.

What happens after the result arrives

The result landing in the report is the start, not the end. A good LIMS then applies the reference range for the patient's age and sex, flags what is high or low, checks the delta against the patient's previous result, and puts the report in the pathologist's queue for sign-off. Nothing goes to the patient until a human authorises it. That queue, and the audit trail that records who authorised what and when, is also most of what NABL assessors want to see.

Why we include it in the plan

The common commercial model in India is to sell interfacing as an add-on, often a one-time fee per machine that runs into tens of thousands of rupees, on top of a plan whose price was quoted inclusive of GST to look smaller. We think that is backwards. Interfacing is the feature that makes a LIMS worth buying, so we put it in the Professional plan, and we publish the prices ex-GST so the number on the page is the number on the invoice.

A checklist for buyers

1. List your machines with model numbers. Ask the vendor which are supported and whether each is uni- or bidirectional.
2. Ask what hardware is needed. Usually a serial-to-network adapter per ASTM machine, sometimes nothing.
3. Ask to see a result arrive on a live system, from scan to signed report.
4. Ask what happens when the network drops: does the machine buffer, does the LIMS retry?
5. Ask whether interfacing is in the price or an add-on, and get the answer in writing.