Abbott ARCHITECT Estradiol Calibrators are devices intended for use in the ARCHITECT Estradiol assay test system to establish points of reference that are used in the quantitative determination of estradiol in human specimens. Estradiol measurements are used in the diagnosis and treatment of various hormonal sexual disorders and in assessing placental function in complicated pregnancy. Abbott AxSYM Estradiol Standard Calibrators and AxSYM Estradiol Master Calibrators are devices intended for use in the AxSYM Estradiol assay test system to establish points of reference that are used in the quantitative determination of estradiol in human specimens. Estradiol measurements are used in the diagnosis and treatment of various hormonal sexual disorders and in assessing placental function in complicated pregnancy. Abbott ARCHITECT FSH Calibrators are devices intended for use in the ARCHITECT FSH assay test system to establish points of reference that are used in the quantitative determination of follicle-stimulating hormone (FSH) in human specimens. FSH measurements are used in the diagnosis and treatment of pituitary gland and gonadal discorders ARCHITECT LH Calibrators are devices intended for use in the ARCHITECT LH assay test system to establish points of reference that are used in the quantitative determination of luteinizing hormone (LH) in human specimens. LH measurements are used in the diagnosis and treatment of gonadal function. ARCHITECT Progesterone Calibrators are devices intended for use in the ARCHITECT Progesterone assay test system to establish points of reference that are used in the quantitative determination of progesterone in human specimens. Progesterone measurements are used in the diagnosis and treatment of disorders of the ovaries or placenta. ARCHITECT Prolactin Calibrators are devices intended for use in the ARCHITECT Prolactin assay test system to establish points of reference that are used in the quantitative determination of prolactin in human specimens. Prolactin measurements are used in the diagnosis and treatment of disorders of the anterior pituitary gland or of the hypothalamus portion of the brain AxSYM Total T3 Standard Calibrators and AxSYM Total T3 Master Calibrators are devices intended for use in the AxSYM Total T3 assay test system to establish points of reference that are used in the quantitative determination of total T3 in human specimens. Total T3 measurements are used in the diagnosis and treatment of thyroid disease.
Device Story
Calibrators function as reference standards for Abbott ARCHITECT and AxSYM immunoassay systems; establish calibration curves for quantitative measurement of hormones (estradiol, FSH, LH, progesterone, prolactin) and thyroid hormone (T3) in human specimens. Used in clinical laboratory settings by trained technicians. Input: calibrator material of known concentration; Output: reference points for assay system. Healthcare providers use resulting quantitative values to diagnose/treat endocrine, reproductive, and thyroid conditions. Benefits: ensures accuracy and consistency of patient test results.
Clinical Evidence
No clinical data. Substantial equivalence demonstrated via bench testing and adherence to FDA Guidance for Industry 'Abbreviated 510(k) Submissions for In Vitro Diagnostic Calibrators'.
Technological Characteristics
Calibrators consist of hormone-spiked matrices (Tris buffer, bovine serum, or human serum). Standardization achieved via gravimetric manufacturing and referencing to WHO International Standards or internal standards verified by HPLC/GCMS. Form factor: multi-level liquid calibrators. Connectivity: N/A (reagent component).
Indications for Use
Indicated for use as reference points in quantitative immunoassays for estradiol, FSH, LH, progesterone, prolactin, and total T3 in human specimens to aid in the diagnosis and treatment of hormonal, reproductive, pituitary, placental, and thyroid disorders.
Regulatory Classification
Identification
A calibrator is a device intended for medical purposes for use in a test system to establish points of reference that are used in the determination of values in the measurement of substances in human specimens. (See also § 862.2 in this part.)
Special Controls
*Classification.* Class II (special controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 862.9.
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510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION
DECISION SUMMARY
DEVICE ONLY TEMPLATE
A. 510(k) Number:
K032458
B. Analyte:
Calibrator – estradiol, follicle stimulating hormone (FSH), leuteinizing hormone (LH), progesterone, prolactin, triiodothyronine (T3)
C. Type of Test:
Calibrator
D. Applicant:
Abbott Laboratories
E. Proprietary and Established Names:
Abbott ARCHITECT® Estradiol Calibrators
Abbott AxSYM® Estradiol Standard Calibrators
Abbott AxSYM® Estradiol Master Calibrators
Abbott ARCHITECT® FSH Calibrators
Abbott ARCHITECT® LH Calibrators
Abbott ARCHITECT® Progesterone Calibrators
Abbott ARCHITECT® Prolactin Calibrators
Abbott AxSYM® Total T3 Standard Calibrators
Abbott AxSYM® Total T3 Master Calibrators
F. Regulatory Information:
1. Regulation section:
21 CFR § 862.1150, Calibrator
2. Classification:
Class II
3. Product Code:
JIT, Secondary Calibrators
4. Panel:
Clinical Chemistry (75)
G. Intended Use:
1. Indication(s) for use:
Abbott ARCHITECT Estradiol Calibrators are devices intended for use in the ARCHITECT Estradiol assay test system to establish points of reference that are used in the quantitative determination of estradiol in human specimens.
Abbott AxSYM Estradiol Standard Calibrators and AxSYM Estradiol Master Calibrators are devices intended for use in the AxSYM Estradiol assay test system to establish points of reference that are used in the quantitative determination of estradiol in human specimens.
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Abbott ARCHITECT FSH Calibrators are devices intended for use in the ARCHITECT FSH assay test system to establish points of reference that are used in the quantitative determination of follicle-stimulating hormone (FSH) in human specimens.
ARCHITECT LH Calibrators are devices intended for use in the ARCHITECT LH assay test system to establish points of reference that are used in the quantitative determination of luteinizing hormone (LH) in human specimens.
ARCHITECT Progesterone Calibrators are devices intended for use in the ARCHITECT Progesterone assay test system to establish points of reference that are used in the quantitative determination of progesterone in human specimens.
ARCHITECT Prolactin Calibrators are devices intended for use in the ARCHITECT Prolactin assay test system to establish points of reference that are used in the quantitative determination of prolactin in human specimens.
AxSYM Total T3 Standard Calibrators and AxSYM Total T3 Master Calibrators are devices intended for use in the AxSYM Total T3 assay test system to establish points of reference that are used in the quantitative determination of total T3 in human specimens.
2. Special condition for use statement(s):
For professional use.
3. Special instrument Requirements:
The ARCHITECT test system or the AxSYM test system is required.
H. Device Description:
Calibrator components and validation procedures are described below.
I. Substantial Equivalence Information:
1. Predicate device name(s):
IMx® Estradiol Calibrators
Abbott FSH Calibrators
AxSYM® LH Standard Calibrators
AxSYM® Progesterone Standard Calibrators
Abbott Prolactin Calibrators
Ciba-Corning ACS:180 Prolactin Assay Calibrator
AxSYM® Total T3 Standard and Master Calibrators
2. Predicate K number(s):
K951629
K890135
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K935611
K955025
K896162
K934517
3. Comparison with predicate:
All calibrators are identical to their predicate in intended use.
| Similarities ARCHITECT® Estradiol Calibrators | | |
| --- | --- | --- |
| Item | Device | Predicate |
| matrix | Tris buffer based | Tris buffer based |
| traceability | Standardized to an internal reference standard – manufactured gravimetrically using a stock solution of estradiol (not less that 97% pure by HPLC) at each concentration level | Standardized to an internal reference standard – manufactured gravimetrically using a stock solution of estradiol (not less that 97% pure by HPLC) at each concentration level |
| Differences | | |
| Item | Device | Predicate |
| number | 2 levels (0 and 1600 pg/mL) | 6 levels (0, 50, 250, 750, 1500, 3000 pg/mL |
| Similarities AxSYM® Estradiol Standard Calibrators and AxSYM® Estradiol Master Calibrators | | |
| --- | --- | --- |
| Item | Device | Predicate |
| matrix | Tris buffer based | Tris buffer based |
| Differences | | |
| Item | Device | Predicate |
| traceability | Standardized to an internal reference standard for AxSYM Estradiol – standardized to correlate with GC/MS | Standardized to an internal reference standard – manufactured gravimetrically using a stock solution of estradiol (not less that 97% pure by HPLC) at each concentration level |
| concentration | 6 levels (0, 50, 100, 200, 500, and 1000 pg/mL) (Master contains two of those – 0 and 200 pg/mL – to establish points of reference) | 6 levels (0, 50, 250, 750, 1500, 3000 pg/mL |
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| Similarities ARCHITECT® FSH Calibrators | | |
| --- | --- | --- |
| Item | Device | Predicate |
| matrix | Bovine serum | Bovine serum |
| traceability | Manufactured by addition of FSH to a target concentration – referenced against WHO FSH 2nd International Reference Preparation (IRP) 78/549 | Manufactured by gravimetric addition of FSH to a target concentration – referenced against WHO FSH 2nd International Reference Preparation (IRP) 78/549 |
| Differences | | |
| Item | Device | Predicate |
| number | 2 levels – 0, 100 mIU/mL | 6 levels – 0, 1, 10, 25, 100, 250 mIU/mL |
| Similarities ARCHITECT® LH Calibrators | | |
| --- | --- | --- |
| Item | Device | Predicate |
| matrix | calf serum | calf serum |
| traceability | Manufactured gravimetrically– referenced to WHO LH Human, Pituitary 2nd International Standard 80/552 at each concentration | Manufactured gravimetrically– referenced to WHO LH Human, Pituitary 2nd International Standard 80/552 at each concentration |
| Differences | | |
| Item | Device | Predicate |
| number | 2 levels – 2, 100 mIU/mL | 6 levels – 0, 2, 10, 25, 100, 250 mIU/mL |
| Similarities ARCHITECT® Progesterone Calibrators | | |
| --- | --- | --- |
| Item | Device | Predicate |
| Same intended use | | |
| Differences | | |
| Item | Device | Predicate |
| number | 2 levels – 0.7, 40 ng/mL | 6 levels – 0, 0.7, 2, 7, 20, 40 ng/mL |
| matrix | Human serum | Serum for level 0 and Tris buffer based for the remaining levels |
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| Similarities ARCHITECT® Prolactin Calibrators | | |
| --- | --- | --- |
| Item | Device | Predicate |
| traceability | Referenced to WHO 3rd International Standard 84/500 for Prolactin | Referenced to WHO 3rd International Standard 84/500 for Prolactin |
| matrix | Tris buffer based | Tris buffer based |
| Differences | | |
| Item | Device | Predicate |
| number | 2 levels – 5, 30 ng/mL | 6 levels – 0, 5, 10, 30, 80, 200 ng/mL |
| Similarities AxSYM® Total T3 Standard and Master Calibrators | | |
| --- | --- | --- |
| Item | Device | Predicate |
| matrix | Bovine serum | Bovine serum |
| number | 6 levels – 0, 0.5, 1, 2, 4, 8 ng/mL (only 0 and 1 ng/mL for Master) | 6 levels – 0, 0.5, 1, 2, 4, 8 ng/mL (only 0 and 1 ng/mL for Master) |
| Differences | | |
| Item | Device | Predicate |
| traceability | Manufactured using USP Grade L-triiodothyronine, sodium salt and signal matched to internal reference standards which are traceable to the USP Reference Standard L-triiodothyronine (free acid) at each concentration level. The stock solution concentration is determined by HPLC | Internal reference standards are manufactured using L-triiodothyronine Sodium (HPLC purity 95.0 – 101.0%). Primary and secondary standards are manufactured gravimetrically using this reference standard. All list material is tested against these primary and secondary calibrators. |
J. Standard/Guidance Document Referenced (if applicable):
Abbreviated 510(k) Submissions for In Vitro Diagnostic Calibrators
K. Test Principle:
Not applicable as this submission is for calibrators (for two different test systems).
L. Performance Characteristics (if/when applicable):
1. Analytical performance:
a. Precision/Reproducibility:
Not applicable. See traceability below.
b. Linearity/assay reportable range:
Not applicable.
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c. Traceability (controls, calibrators, or method):
Calibrator validation and stability studies are summarized for each of the calibrators. The sponsor specifies the concentrations of materials evaluated in the studies, the frequency of testing, the method for testing the materials, environmental conditions of storage, and acceptance criteria for the study. Real time studies are being performed to support the stability claims in the labeling.
Abbott ARCHITECT® Estradiol Calibrators are standardized to an internal reference standard and manufactured gravimetrically using a stock solution of estradiol (not less than 97% pure by HPLC) at each concentration level.
Abbott AxSYM® Estradiol Standard Calibrators and Abbott AxSYM® Estradiol Master Calibrators are standardized to an internal reference standard for AxSYM Estradiol which correlates with GC/MS.
Abbott ARCHITECT® FSH Calibrators are manufactured by addition of follicle stimulating hormone to a target concentration and referenced against WHO FSH 2nd International Reference Preparation (IRP) 78/549.
Abbott ARCHITECT® LH Calibrators are manufactured gravimetrically and referenced to WHO Leuteinizing Hormone Human, Pituitary 2nd International Standard 80/552 at each concentration.
Abbott ARCHITECT® Progesterone Calibrators are manufactured by spiking stripped normal male human serum with calculated amounts of a progesterone stock solution. This stock solution is manufactured by adding Progesterone USP gravimetrically to a target concentration which is then assigned to the stock solution. The levels are tested by RLU matching to Progesterone Reference Calibrators. The concentration is adjusted, if necessary, by adding stripped normal male human serum or progesterone stock solution.
Abbott ARCHITECT® Prolactin Calibrators are referenced to WHO 3rd International Standard 84/500 for Prolactin.
Abbott AxSYM® Total T3 Standard Calibrators and Abbott AxSYM® Total T3 Master Calibrators are manufactured using USP Grade L-triiodothyronine, sodium salt and signal matched to internal reference standards which are traceable to the USP Reference Standard L-triiodothyronine (free acid) at each concentration level. The stock solution concentration is determined by HPLC.
d. Detection limit:
Not applicable.
e. Analytical specificity:
Not applicable.
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Page 7 of 7
f. Assay cut-off:
Not applicable.
2. Comparison studies:
a. Method comparison with predicate device:
Not applicable.
b. Matrix comparison:
Not applicable. The sponsor summarizes the methods used for analysis and validation of the calibrator material and matrix.
3. Clinical studies:
a. Clinical sensitivity:
Not applicable.
b. Clinical specificity:
Not applicable.
c. Other clinical supportive data (when a and b are not applicable):
Not applicable.
4. Clinical cut-off:
Not applicable.
5. Expected values/Reference range:
Not applicable.
M. Conclusion:
I recommend that the Abbott ARCHITECT® Estradiol Calibrators, Abbott AxSYM® Estradiol Standard Calibrators, Abbott AxSYM® Estradiol Master Calibrators, Abbott ARCHITECT® FSH Calibrators, Abbott ARCHITECT® LH Calibrators, Abbott ARCHITECT® Progesterone Calibrators, Abbott ARCHITECT® Prolactin Calibrators, Abbott AxSYM® Total T3 Standard Calibrators, and Abbott AxSYM® Total T3 Master Calibrators are substantially equivalent to the legally marketed predicate devices.
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Learn the FDA Browser
Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.