Quick facts
- This article compares the three biological indicator formats that Canadian clinics, laboratories and sterile-processing rooms can buy — self-contained vials, spore strips in envelopes, and glass ampoules — across six supplier product lines, using eight parameters that change what your monitoring record can actually prove.
- Every parameter below comes from a manufacturer instructions-for-use document, a manufacturer technical data sheet, a distributor specification page or the Health Canada Drug Product Database listing; anything a supplier does not publish is written as Not published, and those gaps are one of the findings.
- Read time, incubation temperature and reader dependency are three separate decisions. A format can be read visually in 24 hours, or in 24 minutes through a dedicated reader — and only some formats can do both.
- Cost per test in Canada ranges from about $2.00 to $9.00 for the products below, before any reader or incubator is bought. The capital decision and the consumable decision have to be made together.
Three formats, six supplier lines, and eight parameters: that is the whole of biological indicator selection once you strip the marketing. A self-contained biological indicator brings the spore carrier and the growth medium together in one vial. A strip puts the inoculated carrier inside an envelope and leaves the transfer to you. An ampoule puts the medium in glass that has to be broken, with or without a dedicated crusher. Each of those physical choices changes the read time you can achieve, the equipment you have to buy, the handling step a nurse performs, and the evidence that ends up in your log.
This matters because the biological indicator is the only monitor that measures lethality directly. Chemical indicators react to conditions; a biological indicator grows or does not grow. Ontario's daily expectation in the college's infection prevention and control standard is one biological indicator for each sterilizer on each day it is used, with a control indicator incubated at the same time. A weekly cadence is the CDC and AAMI ST79 baseline used in United States facilities — not the Ontario requirement. Whichever cadence applies to your site, if the format you choose cannot be read reliably on the day it is incubated, the record is weaker than the standard asks for.
What are the three biological indicator formats, and what does each one physically contain?
The three formats are not three grades of the same product. They are three different handling loops, and the loop is what your staff actually live with.
| Format | What is physically in the package | Activation step | Reading step | Where it still fits |
|---|---|---|---|---|
| Self-contained vial (SCBI) | A spore carrier inside a plastic vial, with a sealed glass media ampoule below it. The 3M Attest 1492V design is a carrier with Geobacillus stearothermophilus spores plus a media ampoule in a plastic vial with a brown cap, and a chemical process indicator on the cap that changes from pink to light brown on steam exposure | Crush the ampoule so media reaches the spore chamber. 3M specifies an activator device for the 1492V, and notes that media must be visible in the growth chamber before incubation | Visual pH colour change, or fluorescence in a reader. The 1492V gives a 24-minute fluorescent result in an Attest 490/490H Auto-reader with software 4.0.0 or later, or a 490M; a 1-hour fluorescent result with earlier 490 software; and an optional 48-hour visual pH read | Routine in-office monitoring; any site that wants one handling step and a sealed unit that does not need a transfer |
| Strip in envelope | An inoculated carrier strip inside a primary envelope. A traditional steam spore strip is a 7 mm × 38 mm strip of G. stearothermophilus (cell line 7953) in a white glassine pouch; EO and dry-heat strips use Bacillus atrophaeus | Aseptic transfer out of the envelope into a medium tube, in a clean area | Visual growth in the medium tube, typically 24 hours to 7 days depending on the organism and process | Laboratories and industrial monitoring where cost per test and large batch volumes dominate; also reference work alongside a self-contained system |
| Glass ampoule | Growth medium sealed in a glass ampoule, with the spore carrier inside the same ampoule | Break the ampoule — with a dedicated crusher cavity on some incubators, or in a holder that contains the glass | Visual colour change after incubation, after the ampoule content is mixed | Legacy systems and sites standardised on an ampoule platform; still sold by several suppliers |
Two consequences follow. The self-contained vial is the only format that removes the aseptic-transfer step, and that step is where contamination of the control — and of the test unit — happens. ISO 11138-7:2019 states it directly: "After exposure, the aseptic transfer (if applicable) and incubation of biological indicators as specified by the biological indicator manufacturer is critical for obtaining correct results." A strip in an envelope is not a lower-cost vial; it is a different workflow needing a clean handling area, a medium tube per strip and trained staff.
How do six supplier lines compare on the eight parameters that affect your record?
The comparison below uses publicly available manufacturer documentation. Where a supplier does not publish a value, that is recorded as such rather than inferred from a similar product.
| Supplier line | Format(s) | Test organism | Labelled population | Label read time | Incubation temperature | Dedicated reader needed? | Pack presentation | Documentation trail |
|---|---|---|---|---|---|---|---|---|
| Solventum — 3M Attest (1492V; 1262) | Self-contained vial; process indicator on cap | Geobacillus stearothermophilus | Not published in the 1492V instructions for use; the document states the growth medium meets the growth-promoting requirements of ISO 11138-1:2017 | 24 minutes (490/490H with software 4.0.0+, or 490M), 1 hour with earlier 490 software, optional 48-hour visual pH read | Incubated in the Attest 490, 490H or 490M Auto-reader; the 1262 is used with the Attest Incubator 116 | Yes for the fluorescent result; visual pH read is optional but the instructions state there is no advantage to incubating past the fluorescent result | 1492V vials; the 1262 is a separate vial product for 121 °C gravity and 132 °C vacuum-assisted cycles | Lot number on the vial, readout result and date in the reader record; the instructions require a non-processed control incubated on each day a processed indicator is incubated |
| Terragene — Bionova (BT20; BT220; BT224) | Self-contained vial | G. stearothermophilus (ATCC 7953) | BT224: 10⁶ spores per vial; BT20: listed by a Canadian distributor as 10⁵ or 10⁶ spores per vial | BT20: 24 hours; BT220: 3-hour fluorescent result; BT224: 20 minutes with the Bionova reader | BT20: 60 ± 2 °C; Bionova readers incubate at 37 ± 2 °C or 60 ± 2 °C | BT20 visual read: no reader. BT220/BT224 fluorescent read: Bionova Auto-Reader incubator | BT224: 50 per pack; BT20: 100 per pack | Vial label carries sterilizer number, load number and processing date (the BT20 instructions tell the operator to write all three); certificate of species, population, purity and resistance available for the family |
| Mesa Labs — EZTest test pack | Self-contained vial inside a test pack | G. stearothermophilus, 10⁵ per the directions for use | 10⁵ per indicator, printed in the EZTest Biological Test Pack directions | 24 hours at 55–60 °C; a chemical integrator record card in the pack gives a visible pass indication after the cycle | 55–60 °C — "Any microbiological incubator that is adjusted for 55–60 °C will satisfy the incubation conditions for the EZTest" | No incubator is proprietary; a reader is only relevant to the rapid-read variant of the family | Test packs with 25 packs per case, each containing one indicator plus a chemical integrator record card; positive controls supplied with each case | Lot number printed on the record card, the indicator label and the case label; results recorded on the integrator card; unexposed control incubated at a stated interval in the directions |
| Crosstex — SporView / SporView10 | Self-contained vial; also supplies spore strips | G. stearothermophilus for steam; B. atrophaeus for EO and dry heat | Not published on the product pages reviewed | Depends on the family: standard visual read for the SCBI line; strip products read after the incubation period stated on the product's technical data sheet | Governed by the incubator: the Crosstex dry-block platform is offered at 55–60 °C and at 37 °C | No reader for visual SCBI; the well diameter is the compatibility question, not the brand | SCBIs and strips; standard dry-block incubators in 11 mm and 13 mm well sizes | Technical data sheets state carrier dimensions, primary packaging and population range for spore suspension products |
| SPS Medical — SporView platform (published with Crosstex) | Self-contained vial | G. stearothermophilus | Not published on the pages reviewed | Standard visual read | 55–60 °C (NDB-060 dry-block); 37 °C module for EO (NDB-037) | No | Dry-block incubators with 11 mm or 13 mm wells; SCBIs | The NDB-060 is documented by Crosstex as the 11 mm option "designed for use with SporView and SporView10 SCBIs" — the well diameter, not the brand, decides whether a vial fits |
| Propper — BI-O.K. | Self-contained vial (steam and EO) | G. stearothermophilus for the steam vials, per the manufacturer's product page | Not published on the pages reviewed | Standard visual read; the incubator includes a crusher cavity for activation | The BI-O.K. incubator is a universal unit with steam and EO settings | No — the incubator is universal rather than tied to a single readout chemistry | Vials for steam and EO; incubator with 13 incubation cavities plus 1 crushing cavity | Manufacturer instruction sheet and lot coding on the vial; distributor pages sell the incubator without publishing a Canadian list price |
Two rows are worth reading as a pair. The Mesa Labs EZTest documents a population of 10⁵ in its directions and states plainly that any incubator holding 55–60 °C will satisfy the incubation conditions — an open platform, in writing. The 3M Attest 1492V documents a 24-minute fluorescent result that its instructions correlate with a 7-day visual read in at least 97% of cases — a paired system, in writing: the read time belongs to the vial and the reader together.
The empty cells are the second finding. Across six supplier lines, the labelled population is published in the technical documentation of one line (Mesa Labs, 10⁵) and in distributor catalogue copy for one more (Bionova). Where population is not on the public page, it is still on the product: ISO 11138-1:2017 requires a biological indicator to be characterised for species, population and resistance, and the supplier is expected to provide the certificate. Request it as a document before you standardise, because a monitoring record that cannot state the population behind the indicator cannot answer a reviewer's question about it.
What does ISO 11138-1 and ISO 11138-3 require before a product is sold as a biological indicator?
The ISO 11138 series is the reason a spore vial is a medical product rather than a consumable. Part 1 fixes the general requirements; the numbered parts then apply them process by process.
| ISO 11138 part | Applies to | Test organism used in the part | What it fixes for a buyer |
|---|---|---|---|
| Part 1:2017 — General requirements | All biological indicators | Defined by the process-specific part | Manufacturing requirements, determination of population and resistance, and culture conditions. Its annexes cover viable count (A), growth inhibition of carrier and primary packaging (B), D-value by survivor curve (C), D-value by fraction-negative (D), survival-kill response (E) and the relationship between parts (F) |
| Part 2:2017 | Ethylene oxide | Bacillus atrophaeus | The claims a label may carry for EO cycles |
| Part 3:2017 | Moist heat (steam) | Geobacillus stearothermophilus | The claims a label may carry for steam cycles — the part cited by the 3M Attest 1492V and the Bionova steam family |
| Part 4:2017 | Dry heat | Bacillus atrophaeus | Dry-heat indicators, including strip products supplied for dry-heat processes |
| Part 5:2017 | Low-temperature steam and formaldehyde | Process-specific | Claims for LTSF processes |
| Part 7:2019 | Selection, use and interpretation | All | Replaced ISO 14161:2009; it is where the standard says the aseptic transfer and incubation "as specified by the biological indicator manufacturer" is critical to a correct result |
| Part 8:2021 | Reduced incubation time validation | All | Defines how a shortened read time is validated — the reason a 24-minute or 3-hour result is a paired vial-and-reader claim rather than a property of the vial alone |
Read the table as a purchasing instrument. A rapid read-time claim is validated under Part 8; a D-value claim is determined under Part 1 with its annexes; and a document on file for the population behind your indicator is a Part 1 output, not a marketing page.
Genorma publishes the catalogue entry for ISO 11138-1:2017 and the Estonian standards centre lists the EN adoption; Mesa Labs, a biological indicator manufacturer, documents the D-value methods under Annex D. DIN Media records that ISO 14161:2009 has been withdrawn and replaced by ISO 11138-7:2019, and ISO 11138-8:2021 is listed by Genorma.
How does format choice change your traceability chain?
A traceability chain for spore testing has five links, and the format you buy decides how many of them your staff perform by hand.
| Link in the chain | Self-contained vial | Strip in envelope | Ampoule |
|---|---|---|---|
| Exposure | Indicator goes into the load or a process challenge device with the load | Same | Same |
| Transfer | None — media is already in the vial and is released by crushing | Aseptic transfer into a medium tube in a clean area | None, but the glass has to be broken safely |
| Activation | Crush the ampoule; 3M requires media in the growth chamber before incubation, and the BI-O.K. incubator provides a dedicated crushing cavity | Inoculate the tube; tube handling is the contamination risk | Break the ampoule in a crusher or a holder that contains the glass |
| Reading | Visual colour change and/or fluorescence in a reader | Visual growth or colour change in the tube | Visual colour change |
| Record | Lot number, sterilizer, cycle, load, date, result, control result | Same, plus the transfer step performed by the operator | Same, plus the ampoule identity |
One rule outranks the format choice: the control. The 3M Attest 1492V instructions state that on each day a processed indicator is incubated, at least one non-processed control indicator from the same lot is activated and incubated, labelled with "C" and the date, to confirm that incubation temperature was met, that spore viability was not altered by storage, and that the medium supports growth. The Mesa Labs EZTest directions describe a different interval for that family, in which unexposed controls supplied with each case run with every sixth test pack. A clinic that adopts a supplier's interval without checking its own jurisdictional expectation can end up with a defensible product record and an indefensible monitoring record.
That is why the control question belongs in the specification conversation. Buy the format whose control handling your staff will actually perform at the cadence your jurisdiction expects — not the format with the shortest read time if the read time requires a reader nobody maintains, and not the least expensive consumable if the transfer step it requires happens in a corridor.
What does each format cost per test in Canada?
Price is not a quality ranking. It is a segmentation map, and the per-test column is the one that matters, because pack size varies from 25 to 100 units. All figures are Canadian retail listings from one Canadian dental supplier on 18 September 2026 unless noted, and our own store listings are shown in the same table so the comparison is visible on the same day.
| Product | Format and read time | Pack | Listed price (CAD) | Cost per test |
|---|---|---|---|---|
| Bionova BT20 (Terragene) | Self-contained, 24-hour visual, 10⁵ or 10⁶ spores per vial | 100 per pack | $199.99 | $2.00 |
| CliniEco Medical 24-hour biological indicator | Self-contained vial, 24-hour visual read | 25 per pack | $59.99 | $2.40 |
| SciCan Ensure biological indicators | Self-contained, results in as little as 24 hours | 100 per pack | $379.99 | $3.80 |
| CliniEco Medical 3-hour rapid readout indicator | Fluorescent rapid readout vial, 50 per pack | 50 per pack | $199.99 | $4.00 |
| 3M Attest Super Rapid Readout, 24-minute | Self-contained vial with fluorescent readout in an Attest reader | Pack size not published on the listing reviewed | $349.99 | Not calculable from the listing |
| Bionova BT224 (Terragene) | Self-contained ultra-rapid, 10⁶ spores per vial, 20-minute readout | 50 per pack | $449.99 | $9.00 |
| Medicom AssureCheck Rapid | Self-contained ampoule with built-in chemical indicator, 20-minute readout with the AssureCheck Smart Incubator | Pack size not published on the listing reviewed | $309.99 | Not calculable from the listing |
| CliniEco Medical biological indicator 5-pack trial | Self-contained vial, trial quantity | 5 per pack | $12.99 | $2.60 |
Prices were read from a Canadian dental supplier's public product feed and from our own store listings on 18 September 2026. Products whose listing states no pack size carry the price only, because dividing by an assumed pack size would produce a figure the buyer cannot verify.
The capital side of the decision sits outside that table. A 24-well dry-block incubator for 24-hour vials is listed at $279.00 in our own store, a 4-well fluorescence reader at $1,499.00, and the reader's seed trial is a separate entry point at no cost. A reader is not optional if you buy a fluorescent format; the fluorescent result exists only inside the reader, and its 24-minute timing is a property of the paired system.
How do you choose a format for your clinic without re-doing the decision twice?
Start from the record you have to produce, then work backwards.
- Write down the cadence. If your site monitors each day the sterilizer is used, one indicator per sterilizer per day plus a control is the volume to size against. A 25-pack is roughly one month for one sterilizer at that cadence; a 100-pack is roughly one quarter.
- Decide whether the read is same-day or next-day, then check the reader's role. A 24-hour visual read needs an incubator and nothing else. A 20-minute or 3-hour fluorescent read needs the reader that the validation was built around, and that reader has its own maintenance, its own temperature behaviour and, in most brands, its own consumable family.
- Confirm the physical fit before you commit to a brand. The documented failure mode in this category is a vial that does not fit the block: the 11 mm well option on the Crosstex and SPS Medical platform is documented for the SporView and SporView10 SCBIs, while the 13 mm option is documented for traditional SCBIs and media tubes. Measure the vial and the well before you standardise.
- Ask for the certificate, not the brochure. Population, D-value, species and lot documentation come from ISO 11138-1 testing. If a supplier cannot produce it for the lot you are buying, the product is not a monitoring instrument in the sense the standard uses.
- Keep the control step in the plan. Whatever the format, the control indicator is part of the consumable maths. It is not a spare vial; it is a scheduled one.
If you are building the whole monitoring picture rather than picking a vial, three articles in this series walk the adjacent decisions: the comparison of self-contained indicators against strips and ampoules, the explanation of how ISO 14161 and the ISO 11138 series fit together, and the market-wide comparison of rapid readout readers. For the incubator decision specifically, the dry-block incubator comparison across SPS Medical, Crosstex, Propper and open options covers well diameters and temperature behaviour, and the growth control and incubation temperature article covers the control step this article mentions but does not replace.
If you are specifying monitoring for a Canadian clinic or laboratory, the sterilization compliance hub indexes the requirements these articles reference. The consumables shown in the cost table are listed alongside the 24-hour indicator 25-pack, the five-pack trial for a first evaluation, and the hardware that closes the loop — a 24-well dry-block incubator and a 4-well fluorescence reader. The sterilization monitoring collection groups the indicators, readers and incubators in one place, and facilities buying in volume can open a wholesale account.
Related reading
For the format definitions used above, see self-contained indicators versus strips and ampoules; for the standard's vocabulary — population, D-value and the survival-kill response — see SAL, log reduction and D-value; and for the hardware decision paired with this one, see dry-block incubators compared. · CliniEco Medical Biological Indicator
Frequently Asked Questions
Is a self-contained biological indicator better than a spore strip?
Neither is universally better; they differ in handling. A self-contained vial keeps the spore carrier and growth medium in one sealed unit and needs no aseptic transfer, which removes the contamination risk of moving a strip into a medium tube. A strip in an envelope costs less per test for high-volume batch work but requires a clean handling area, a medium tube per strip and trained staff. Choose the format whose handling step your team will perform consistently, and check that its documentation meets ISO 11138-1.
Do rapid readout biological indicators need a dedicated reader?
Yes, for the fluorescent result. A visual pH colour change can be read by eye in an incubator that holds the required temperature, which is why the Mesa Labs EZTest directions state that any incubator adjusted to 55–60 °C satisfies the incubation conditions. A 24-minute, 3-hour or 20-minute fluorescent result exists only inside the reader its validation was built around, and ISO 11138-8:2021 defines how that reduced incubation time is validated.
What incubation temperature do steam biological indicators need?
It depends on the product and the organism. Steam indicators use Geobacillus stearothermophilus, and the products reviewed here incubate at 55–60 °C (Mesa Labs EZTest) or 60 ± 2 °C (Bionova BT20). Ethylene oxide indicators use Bacillus atrophaeus at a lower temperature, which is why some dry-block incubators are offered in both 55–60 °C and 37 °C configurations. The instruction sheet that ships with the lot is the authority for your product.
How often is a control biological indicator needed?
The control is part of the monitoring record, not a spare. The 3M Attest 1492V instructions state that on each day a processed indicator is incubated, at least one non-processed control from the same lot is activated, incubated and labelled with the date, which confirms that incubation temperature was met, that spore viability survived storage and that the medium supports growth. Some families document a different interval, so match it to the expectation that applies to your facility and re-check it when you change suppliers.
Why do supplier pages often not publish the spore population?
Population is a characterisation value that ISO 11138-1:2017 requires a biological indicator to be tested for, and it normally travels as a certificate with the lot rather than as marketing copy. In this comparison one supplier documents 10⁵ per indicator in the product directions, one lists 10⁵ or 10⁶ per vial in distributor copy, and the remaining lines publish no figure on the pages reviewed. Ask for the certificate for the lot you are buying; a record that cannot state the population behind the indicator cannot answer a reviewer's question about it.
Can a clinic use any brand of biological indicator in any incubator?
For a visual read the constraint is physical and thermal, not brand. The vial has to fit the well — Crosstex documents its 11 mm well option for SporView and SporView10 indicators and its 13 mm option for traditional indicators and media tubes — and the block has to hold the temperature the vial's instructions specify. For a fluorescent rapid read the vial and reader are a validated pair, so the reader decides which indicators you can use.
How many biological indicators should a clinic stock for one sterilizer?
Work from the cadence, not a rule of thumb. If your site monitors each day the sterilizer is used, plan one indicator per sterilizer per use-day plus a control on the same day, and allow for repeat testing after a failed or questionable cycle. At roughly 250 use-days a year, one sterilizer consumes about 250 indicators plus controls; a 25-pack covers about a month and a 100-pack about a quarter at that cadence. Facilities with several sterilizers should size the pack and the incubator well count together.
CliniEco Medical holds MDEL #35334.
Sources
- 3M Attest 1492V — instructions for use (Solventum)
- 3M Attest 1262 — product information (Solventum Canada)
- Bionova BT20 24-hour steam indicator — product page
- Bionova BT220 3-hour steam indicator — product page
- Mesa Labs EZTest test pack — directions for use (PDF)
- Crosstex SporView10 SCBIs and NDB-060 well size
- Crosstex biological indicators with ISO 11138-4 dry-heat strip detail
- Crosstex steam spore strip data sheet (BS-10x, distributor copy)
- Propper BI-O.K. steam indicator vials — manufacturer page
- Propper BI-O.K. incubator, 13 cavities + 1 crusher — distributor spec
- ISO 11138-1:2017 — catalogue entry (Genorma)
- DIN Media — ISO 14161 withdrawn, replaced by ISO 11138-7:2019
- Genorma — ISO 11138-8:2021 reduced incubation time validation
- EN ISO 11138-1:2017 adoption listing (Estonian standards centre)
- RCDSO — spore testing each day the sterilizer is used
- Public Health Ontario — provincial guidance on reprocessing
- JCDA — biological indicator monitoring in Canadian practice (2021)
- BMC Oral Health — spore test failure rates and human factors
- Canadian supplier listing — Bionova BT20 and BT224 prices in CAD
- Canadian supplier listing — 3M Attest rapid readout price in CAD
- Mesa Labs — D-value determination under ISO 11138-1:2017 Annex D
- sterilization compliance log sheet (free tool)
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