Short answer: CAP's reagent labeling requirement (COM.30300 in recent editions) is about content and concentration, storage requirements, preparation date, and expiration date. Those details can go on the container or in a log, as long as every container can be traced to its log entry. Hazard (precautionary) labeling falls under a separate requirement in the Chemical Safety section of the Laboratory General Checklist. Neither CAP's reagent labeling requirement nor OSHA's Hazard Communication Standard requires an NFPA 704 diamond on every container. CAP asks for deficiency responses within 30 days of the inspection, submitted online.
About checklist editions: CAP updates its checklists every year, and the full requirement text is available only to enrolled laboratories through e-LAB Solutions Suite (ELSS). This page summarizes the requirements in plain language. Before you respond, check the requirement number and wording in the edition CAP issued to your laboratory.
What CAP's reagent labeling requirement covers
The reagent labeling requirement applies to nonwaived testing. It is listed as "COM.30300 Reagent Labeling – Nonwaived Tests" in CAP's 2025 top-deficiency summary, revised March 2026. In general terms, the laboratory labels reagents, calibrators, controls, stains, chemicals, and solutions, as applicable, with:
Content and quantity, concentration, or titer
Storage requirements
The date it was prepared, filtered, or reconstituted by the laboratory
Expiration date
Points from the requirement's note that often matter in a response:
A traceable log is acceptable. The elements can go in a paper or electronic log instead of on each container, provided each container is identified so it can be traced to the right log entry.
"Date received" and "date opened" aren't routinely required. You do have to record a new expiration date if opening a container changes its expiration date or storage requirements.
Multi-unit packs. If individual units, such as cartridges, are stored outside the original container, each unit needs its own expiration date.
Chemicals used in testing are included. The requirement also covers chemicals used to prepare reagents or used in the preanalytic and analytic phases of testing. That's why a stainer finding can end up written under the reagent labeling requirement.
Hazard labeling is handled elsewhere. The note refers precautionary labeling of hazardous chemicals to the Chemical Safety section of the Laboratory General Checklist.
Evidence of compliance is properly labeled reagents or logs that trace to them.
The requirement follows the CLIA regulation at 42 CFR 493.1252(c). Under that rule, reagents, solutions, control and calibration materials, and other supplies must be labeled with identity, and with titer, strength, or concentration when significant; storage requirements; preparation and expiration dates; and other information needed for proper use. The regulation doesn't mention hazard ratings.
Why CAP cites it most often
CAP lists these as the most common reasons for COM.30300 citations:
Expiration dates are missing from the label.
Secondary containers are missing required information.
Stain lines aren't labeled, and the log sheets in use can't be traced to the required information.
Reagent labeling vs. chemical hazard labeling
These are two different requirements, and responses often go wrong when they get mixed up.
Where it sits. Reagent labeling (COM.30300 in recent editions): All Common Checklist, Reagents section; Chemical hazard (precautionary) labeling: Laboratory General Checklist, Chemical Safety section (GEN.76200 in older published editions)
What it asks for. Reagent labeling (COM.30300 in recent editions): Content and concentration, storage, preparation date, expiration date; Chemical hazard (precautionary) labeling: Type of hazard and what to do after accidental contact
Log or posting allowed?. Reagent labeling (COM.30300 in recent editions): Yes, a traceable log in place of container labels; Chemical hazard (precautionary) labeling: OSHA allows signs or placards for stationary process containers (see below). Confirm what your CAP edition allows.
Regulatory basis. Reagent labeling (COM.30300 in recent editions): CLIA, 42 CFR 493.1252(c); Chemical hazard (precautionary) labeling: OSHA, 29 CFR 1910.1200 and 1910.1450
If the inspector's finding is really about missing preparation or expiration dates, or a stain line that can't be traced to a log, it's a reagent labeling problem, and the usual answer is to correct it. If the finding says only that hazard symbols or NFPA diamonds were missing from reagent boats, look closely at what each requirement actually asks for before you decide how to respond.
What OSHA says about hazard labels and NFPA diamonds
CAP's chemical safety requirements draw on OSHA. The current federal text says:
29 CFR 1910.1200(f)(6). What it says: Workplace containers need either the full shipped-container label information or a product identifier plus words, pictures, symbols, or a combination that gives at least general hazard information.; Why it matters for stain lines: No particular rating system (NFPA, HMIS, or GHS) is required.
29 CFR 1910.1200(f)(7). What it says: Signs, placards, process sheets, batch tickets, operating procedures, or similar written materials may be used instead of labels on individual stationary process containers, as long as they identify the containers they cover and are readily accessible to employees in the work area during each shift.; Why it matters for stain lines: A posted stainer station map with hazard information can meet this.
29 CFR 1910.1200(f)(8). What it says: Portable containers filled from labeled containers and meant only for the immediate use of the person who filled them don't need labels.; Why it matters for stain lines: This covers short-term transfers only.
29 CFR 1910.1200(b)(3). What it says: In laboratories, the standard applies only to keeping incoming labels intact, keeping safety data sheets accessible, training, and labeling chemicals the lab ships out.; Why it matters for stain lines: Laboratories have narrower Hazard Communication duties than other workplaces.
29 CFR 1910.1450(h)(1). What it says: Under the OSHA Laboratory Standard, employers must keep labels on incoming containers intact and keep safety data sheets readily accessible.; Why it matters for stain lines: Hazard information is managed through the chemical hygiene plan.
NFPA 704 is the National Fire Protection Association's standard for identifying material hazards for emergency response. Many labs put NFPA diamonds on secondary containers because staff recognize them, and that's fine when staff are trained to read them. But OSHA doesn't require an NFPA diamond on each reagent boat, and CAP's reagent labeling requirement doesn't either. Past published editions of CAP's precautionary-labeling requirement didn't name a specific rating system. If a citation says "NFPA labels required," ask which requirement text supports it.
Decide: correct or challenge
You can challenge a deficiency only if your laboratory met the requirement at the time of the inspection and you have records dated before the inspection to prove it. Otherwise, write a corrective action.
Prepared reagents or stain-line containers had no preparation or expiration date and no traceable log entry. Usual approach: Correct. This is the core of the reagent labeling requirement.
A log existed, but station or container numbers didn't match it. Usual approach: Correct. Renumber, update the log or station map, and retrain staff.
Hazard information was posted but didn't say which containers it covered, or staff couldn't find it. Usual approach: Correct. Fix the posting and the procedure.
All reagent labeling elements were in a traceable log, hazard information was posted for each station, and both are documented and dated before the inspection, but the citation asked for NFPA diamonds on each boat. Usual approach: Consider a challenge, supported by your dated records and the requirement text in your edition.
The citation asks for labels inside the reagent path that conflict with the instrument manufacturer's instructions. Usual approach: Challenge, or correct using a compliant alternative, such as a station map, with the manufacturer's instructions attached.
How to write the corrective action
CAP's current response instructions and its Online Deficiency Response tutorials are in ELSS. Follow them for format and submission. A response that's easy to review usually covers five things:
The deficiency as cited, with the requirement number from your Inspection Summation Report (ISR).
Root cause, in one or two sentences. For example: "Reagent changes on the automated stainer were recorded by reagent name only, so containers could not be traced to preparation and expiration dates."
Corrective action, with dates. For example: a stainer station map listing each station number, reagent, concentration, storage requirement, and expiration tracking method, posted on the instrument and approved by the laboratory director.
Evidence that it's in place. The approved procedure, a photo of the posted map, completed log pages (not blank templates), and staff training sign-off.
How you'll keep it in place. For example, add the stainer map and log to your reagent change checklist and your self-inspection.
Put the requirement number on each supporting document, point the reviewer to the relevant section of each attachment, and remove all protected health information. For the evidence reviewers look for, see our guide to CLIA, COLA, CAP and CMS evidence of correction.
Corrective action example (adapt to your facts)
Deficiency: COM.30300. Reagent containers on the automated stainer were not labeled, and the stainer log could not be traced to individual stations.
Corrective action: On [date], the laboratory created a stainer station map listing each station number, reagent name, concentration, storage requirement, and expiration date tracking, along with hazard information taken from each safety data sheet. The map is posted on the stainer and referenced in the revised procedure "Reagent and Chemical Labeling," approved by the laboratory director on [date]. The stainer reagent log now records each change by station number, with preparation and expiration dates (completed pages attached). Histology staff were trained on [date] (sign-off attached).
Ongoing monitoring: The station map and log were added to the monthly safety walk-through checklist (attached).
How to write a challenge
A challenge needs to be factual, clearly labeled as a challenge, and backed by records dated before the inspection. A strong challenge on a hazard-label citation usually includes:
What the requirement asks for. Summarize the elements in your edition's reagent labeling requirement and its note sending hazard labeling to the Chemical Safety section.
The precautionary labeling requirement. Cite it by the number in your edition, along with 29 CFR 1910.1200(f)(7) for stationary process containers.
Pre-inspection evidence. A dated photo of the posted station map, the approved procedure with its effective date, completed log pages, the relevant chemical hygiene plan pages, and training records.
Manufacturer instructions, if they apply. If the instrument manufacturer advises against adhesive labels in the reagent path, attach that page or a written statement from the vendor.
A clear request. Ask that the deficiency be removed because the laboratory met the requirement at the time of inspection.
Keep the tone neutral. You're showing the reviewer the requirement and your evidence, not arguing with the inspector.
Challenge example (adapt to your facts)
Laboratory Challenge: COM.30300
The laboratory challenges this deficiency. The reagent labeling requirement calls for content and concentration, storage requirements, preparation date, and expiration date, and allows these elements to be kept in a log traceable to each container. At the time of inspection, all required elements for the automated stainer were recorded in the stainer reagent log by station number (log pages dated [range] attached). Hazard information for each station was posted on the instrument, as permitted for stationary process containers under 29 CFR 1910.1200(f)(7) and [precautionary labeling requirement number in our edition] (dated photo and procedure effective [date] attached). The instrument manufacturer's instructions do not support adhesive labels in the reagent path (excerpt attached). We request that this deficiency be removed.
Deficiency response timeline
Inspection Summation Report (ISR). What CAP says now: The inspection team finalizes the ISR, which lists the deficiencies cited, and gives a copy to the laboratory director at the summation conference.
Response deadline. What CAP says now: Respond to all deficiencies cited in the ISR within 30 days. CAP's accreditation guide says to submit responses online within 30 calendar days after the inspection date. If your inspection used advance document review, the 30 days start when the inspection is completed.
How to submit. What CAP says now: Online, through ELSS. CAP offers Online Deficiency Response tutorial videos and an FAQ.
After you submit. What CAP says now: A CAP technical specialist reviews the responses and may ask for more documentation. Answer quickly. CAP's guide for new laboratories says to expect an accreditation decision within about 50 days of the inspection date.
Questions. What CAP says now: CAP technical specialists: 800-323-4040, ext. 6065, or accred@cap.org.
Late or incomplete responses can delay the accreditation decision, so start building your documentation as soon as the inspection ends.
How to prevent a repeat citation
Have a written reagent and chemical labeling procedure that says which method you use for each container type: a direct label, a traceable log, or a posted station map.
Keep a stainer station map listing station numbers, reagents, concentrations, storage requirements, expiration tracking, and hazard information. Update it every time the protocol changes.
Keep log numbering matched to the instrument. The station numbers on the stainer, the map, and the log should all agree.
Label secondary containers and squirt bottles that are kept past immediate use.
Maintain a current chemical inventory with accessible safety data sheets, tied to your chemical hygiene plan.
Keep training records showing staff know where hazard information is posted and what it means.
During self-inspection, compare the stainer, the map, and the log side by side.
Get help with a CAP labeling citation
Sound Lab Consultants helps laboratories respond to CAP and CLIA inspection findings and prepare for the next one. For a reagent or chemical labeling citation, we can review your ISR against the requirement text in your edition, help you decide whether to correct or challenge, draft the response narrative, organize the supporting documents, and update your labeling procedure, station maps, and chemical hygiene plan.
With a 30-day deadline, it pays to start early.
Frequently asked questions
What does CAP's reagent labeling requirement (COM.30300) require?
For nonwaived testing, reagents, calibrators, controls, stains, chemicals, and solutions must be labeled, as applicable, with content and concentration, storage requirements, preparation date, and expiration date. These elements can be kept in a paper or electronic log instead, if each container can be traced to its log entry. Check the exact wording in your laboratory's checklist edition.
Does COM.30300 require NFPA labels on stainer reagent boats?
No. The reagent labeling requirement covers identity, concentration, storage, and dates. Its note refers precautionary hazard labeling to the Chemical Safety section of the Laboratory General Checklist. OSHA's Hazard Communication Standard requires at least general hazard information but doesn't mandate the NFPA system.
Can we use a log or station map instead of labeling each reagent boat?
For reagent labeling elements, yes, as long as every container is identified so it can be traced to the log. For hazard information, OSHA allows signs, placards, or written materials for stationary process containers if they identify the containers they cover and staff can access them during each shift (29 CFR 1910.1200(f)(7)). Confirm how your CAP edition treats this.
Why was a stainer issue cited under COM.30300?
The reagent labeling requirement also applies to chemicals used to prepare reagents or used during testing. CAP lists unlabeled stain lines and log sheets that can't be traced to the required information among the most common reasons for this citation.
How long do we have to respond to a CAP deficiency?
CAP asks laboratories to respond to the deficiencies on the Inspection Summation Report within 30 days, and its accreditation guide says to submit responses online within 30 calendar days after the inspection date.
When should we challenge instead of correct?
Only when your laboratory met the requirement at the time of the inspection and you can prove it with records dated before the inspection. Label the response clearly as a challenge and attach the evidence. If you can't document pre-inspection compliance, write a corrective action.
Does OSHA require NFPA 704 diamonds on laboratory containers?
No specific rating system is required. 29 CFR 1910.1200(f)(6) calls for a product identifier and at least general hazard information in words, pictures, symbols, or a combination. Many labs use NFPA or GHS symbols on secondary containers, which works when staff are trained to read them.
Sources
College of American Pathologists, 2025 CAP Top 10 Most Common Checklist Deficiencies (revised March 2026), including COM.30300 Reagent Labeling – Nonwaived Tests
College of American Pathologists, Inspection Tools and Training (after the inspection: respond within 30 days; Online Deficiency Response tutorials)
College of American Pathologists, Guide to Accreditation (November 2025)
College of American Pathologists, Advance Document Review for CAP Accreditation Inspections
College of American Pathologists, Accreditation Checklists (full text available to enrolled laboratories in ELSS)
42 CFR 493.1252, Test systems, equipment, instruments, reagents, materials, and supplies
29 CFR 1910.1200, Hazard communication
29 CFR 1910.1450, Occupational exposure to hazardous chemicals in laboratories
This page is general information, not legal advice or an official CAP interpretation. CAP checklist requirements change between editions. Confirm requirement numbers and wording in the edition CAP issued to your laboratory, and contact CAP with interpretation questions.