Specimen chain of custody for mobile phlebotomy: what the record has to show

In a draw station, the specimen goes ten feet from the chair to the lab window. On a mobile route it rides in a cooler across a county, changes hands in a parking lot, or waits in a lockbox at a nursing station until a courier comes by. Each of those moves is a place where a tube goes missing or reaches the lab past its stability window, and each is a question a lab or a client will eventually put to dispatch.

A chain of custody record answers it: who had the specimen at each point, and when. For a mobile team that record is built from the taps the tech already makes, and it is only as strong as its weakest handoff.

One note on the term. In forensic and workplace drug testing, chain of custody means a signed custody and control form, tamper-evident seals and a defined legal process. A dispatch record doesn't replace that form. This post is about the operational record for clinical draws and courier runs, the one dispatch pulls up when the phone rings.

The questions the record has to answer

When a lab calls about a specimen that never arrived, or a facility says nobody showed up, the record should answer these without anyone calling the tech:

1. Who was there, and when? The tech's name and the times they arrived and departed, which bracket the draw. The collection time the lab accessions on is still the one written on the tube label and requisition. The dispatch record backs it up.
2. Who has it now? If the specimen changed hands, the record shows who gave it, who took it and when.
3. Was it left anywhere? If a tech left specimens at a facility for courier pickup, the record shows which orders were left and who picked them up.
4. When did it reach the lab? The drop time at the lab or drop site, and the name of whoever made the drop.
5. How long was it in transit? The gap between departure and drop is the number you hold up against the lab's stability and processing rules.

If any of those answers lives only in someone's memory or a text thread, the chain has a gap.

Timestamp the steps the tech already takes

The cheapest custody record is the one the tech builds by doing the job. A mobile visit has fixed steps:

• Confirmed. The tech accepts the stop.
• En route. The tech leaves for it.
• On site. The tech arrives.
• Departed. The draw is done and the tech leaves.
• Handoff or left for pickup, when the route calls for it.
• Completed. The specimen is dropped at the lab.

Make each step a tap on the tech's phone, and each tap a timestamp with a name on it. That replaces the end-of-shift log and the next-morning reconstruction from texts.

The same timestamps give you a dispatch turnaround time: request to drop, per order. That is not the lab's turnaround, which usually runs from collection or receipt to result. It is the part your team controls and the part you answer for.

The record also has to survive a bad day. Phones die, a tech forgets to tap departed, a status has to be fixed after the fact. Dispatch needs to be able to set any status while the tech is held to the step order, and every change needs to log who made it. A correction that leaves no trace is a gap in the chain. A correction that shows who made it is still an honest record.

Handoffs are where chains break

A tech with a full cooler meets a courier halfway so the specimens make the lab's cutoff, or splits a route with another tech when the day runs long. If the handoff is a verbal "here's everything," nobody can prove later what was in the cooler.

A handoff that holds up has three parts:

• Both people are named. The giver and the receiver are on the record.
• Each specimen is checked off as it changes hands, so the record says which orders went over and which stayed.
• The handoff is timestamped on its own, apart from the draw and the drop, so the record shows when custody moved and not only where the specimen started and ended.

The same rules apply when a tech leaves specimens at a facility for a courier. The tech checks off exactly what was left. The courier sees that list and picks up exactly that. If something is missing at pickup, you know where to look.

Where the clipboard and the group text break

Most teams start with a clipboard and a group chat. It holds while the team is small. It stops holding when:

• Two dispatchers are covering the same day and each thinks the other sent the courier.
• A lab asks about a specimen from three weeks ago and the texts are on a phone that's been replaced.
• A client asks for every STAT from last month with its turnaround, and somebody spends a day building a spreadsheet.

A shared, timestamped record turns each of those into a lookup.

What to make a courier software vendor prove

Every vendor will say it tracks chain of custody. Make it prove that on a live screen with a real handoff:

• A tech hands part of a cooler to another tech. Does the record show which specimens went over and which stayed?
• A tech leaves specimens at a facility. Does the courier's screen list exactly those specimens?
• A dispatcher corrects a missed status. Does the audit trail show who changed it and when?
• A client asks for last month's STATs. Can you export them, with turnaround, without building a spreadsheet?
• A client user signs in. Can they see any other client's orders?

Dependable Dispatch was built to answer those on screen. Techs work the tech route on their phone, every step is timestamped, and handoffs and leave-for-pickup check off each specimen as it changes hands. Our specimen courier software page covers drops and pickups in more detail.

Related reading

• How to schedule and dispatch timed draws
• Choosing dispatch software for mobile lab, imaging and home health: a buyer's checklist
• Mobile phlebotomy software: routes, timed draws and the tech's route on the phone