GuidesFor CRCs & lab staff
Why Central Labs Report “Missing” Samples — and How AWB Logging Helps
May 6, 2026GuideLab Specimen WorkbenchAdministrative reference · Zero-PHI examples only
AWBmissing samplelab parsershipment logZero-PHI
What usually sits behind a “missing sample” query, why reconciling from memory fails, and how Lab Specimen Workbench plus the Shipment / AWB Log keeps tracking numbers ready.
The problem on the clinic floor
The email usually arrives mid-morning: central lab cannot find a sample for Visit X. The clinic remembers a ship-out that week. Nobody has a clean record of the air waybill, the ship date, who handed the box off, or whether the tube was primary or secondary. Reconciliation turns into inbox archaeology and a walk to the lab bench to stare at empty Styrofoam.
Requisition paste and bench cards solve a different pain — getting tubes pulled correctly during the visit. They do not, by themselves, prove the box left the building. When manifests are retyped by hand, you also burn time and introduce transcription errors that later look like “wrong visit” or “wrong sample type” on the lab side.
Sites that juggle Labcorp, Q2, Medpace, and generic formats feel this more: each export looks slightly different, so the “official” ship log becomes whatever sticky note was on the courier bag that day.
Partial shipments create confusion too. A visit may require multiple tubes shipped on different days — one box goes Monday, a frozen aliquot goes Tuesday. Without a log entry per ship-out, the lab’s “missing” query might refer to only one leg of a multi-box visit, and the site wastes a day proving the first box already arrived.
Courier handoffs are another weak point. The coordinator who sealed the box is not always the person who handed it to the driver. When nobody recorded handler initials and handoff time, internal finger-pointing replaces a clean reconciliation trail.
Practice context
Central labs reconcile against accession / kit IDs and shipping documents. Site responsibility is to show that specimens were collected, prepared, and shipped under the protocol’s logistics — without putting subject identifiers into an informal shared sheet. An AWB number, ship date, visit label (protocol codes like SCRN or D8), sample type, and handler initials are shipment facts, not patient charts.
When a sample is truly lost in transit, the tracking number is the first useful artifact. When the lab mis-shelved it, the same number still shortens the loop. Either way, “we think it went out Tuesday” is not a reconciliation strategy.
Protocol specimen manuals define collection, processing, and shipping windows. The AWB log does not replace those SOPs — it gives the site a shipment-side record that aligns with what central lab accessioning expects when they search by tracking number or ship date.
Vendor format differences are normal; the site’s control is consistent capture at ship-out, not perfect harmonization of every requisition export. Parsing handles the bench side; logging handles the courier side. Both stay Zero-PHI when limited to visit codes and sample types.
How to use Lab Specimen Workbench for this
Use Lab Specimen Workbench for requisition → bench workflow, and keep the Shipment / AWB Log filled when boxes leave. The habit is simple: if a courier took it, the tracking number goes in the log before the coordinator moves to the next visit — not when the lab email arrives three days later.
- Paste or import requisition / manifest lines for the labs you use. Let vendor auto-detect run, then override if a mixed shipment confuses detection. Fix column mapping once per vendor format so repeat imports are faster.
- Review skip banners for unparseable rows so one bad line does not block the rest of the grab list. Confirm PHI scrub flags before printing 4×6 bench cards — the bench card is for tubes, not identifiers.
- After ship-out, open the Shipment / AWB Log section and record visit label, sample type, primary/secondary, ship date, handler initials, and AWB/tracking number — never subject names, IDs, MRNs, or DOBs. One row per box or ship-out event.
- When a “missing” query arrives, export the AWB CSV (or open the log) and start with the tracking number and ship date instead of reconstructing from memory. Forward those facts to the lab before debating collection timing.
- Export Session Backup (.json) so the lab workspace — including the shipment log — moves with you between clinic PCs. Backup after heavy ship days so a browser clear does not erase the week’s courier record.
Missing-sample emails get shorter when the site can answer with a tracking number first. Log the shipment when the box leaves — not when the lab asks. A five-field row at courier handoff beats a half-day reconstruction thread every time.