How to Write a Laboratory Manual for a Clinical Trial
Tell every site exactly how to collect, handle and ship a sample that will still be analysable.
What a how-to is not
A how-to is SPEQ’s practitioner method, not a procedure. It does not replace your own SOP, it is not a validated approach, and the judgement calls in it belong to your quality unit.
The laboratory manual is the document that stands between a protocol and dozens of sites collecting samples in ways nobody anticipated. Most sample problems in a trial are created before the laboratory ever sees the tube — wrong additive, wrong order of draw, wrong storage, wrong shipping temperature — and they are irreversible. The manual is the only control that acts at the moment the sample is taken.
- 1
Specify the tube, additive and order of draw for every sample
Name each container by additive and volume, and state the order in which tubes are drawn. Carryover between additives produces plausible but wrong results, and the site will not know it happened because nothing looks unusual.
- 2
Describe processing with times and temperatures
Time from collection to centrifugation, speed and duration, temperature, and how the aliquots are made and labelled. A processing step described without its permitted window will be performed at whatever time the clinic day allows.
- 3
Define labelling so an aliquot is identifiable and blinding survives
Specify exactly what goes on the label, including what must not — a label carrying treatment information defeats blinding at the laboratory bench. Labels must also survive the storage they are going into; ink that fails at low temperature produces unidentifiable samples.
- 4
Set storage and shipping conditions and how excursions are handled
Storage temperature and maximum duration, shipping configuration, courier arrangements, and what a site does when a shipment is delayed. Sites need the excursion instruction before an excursion, because the decision is made under time pressure.
- 5
State what is time-critical and what is not
Some assays tolerate delay and some do not. Marking the difference lets a site under pressure make the right trade-off; a manual that treats everything as urgent trains sites to ignore the urgency markers entirely.
- 6
Version it with the protocol and reissue on change
The manual is a controlled document tied to protocol versions. A site working from a superseded manual after a sampling change collects samples the analysis cannot use, and that is discovered at reconciliation when the samples are gone.
- !Order of draw omitted, so additive carryover produces plausible and wrong results nobody questions.
- !Processing steps specified without a permitted time window, leaving them to the clinic schedule.
- !Labels that carry treatment information, or that use ink which fails at storage temperature.
- !A superseded manual left in use at sites after a sampling change, wasting samples irreversibly.
How to Write a Laboratory Manual for a Clinical Trial: frequently asked questions
Common questions on write a laboratory manual for a clinical trial.
Why does order of draw matter so much?
Because additive carried from one tube into the next alters the result without any visible sign. The value looks plausible, the site has no reason to suspect it, and the error is undetectable downstream. It is a rare case where a one-line instruction prevents an entire class of unrecoverable error.
How much detail is too much?
The manual should let a site nurse who has never run a trial perform the collection correctly without telephoning anyone. That is a higher bar than most drafts meet. Detail that does not change what someone does can go; detail about times, temperatures and sequence never can.
What happens when the protocol changes sampling?
The manual is reissued as a controlled version and distributed with confirmation that sites are using it. Samples collected under a superseded manual may be unusable, and unlike most protocol problems this one cannot be corrected after the fact — the sample is already wrong.