Corrections log
Every change made to a published figure since the index opened, with both values and the reason. 10 entries. A short log is not evidence of accuracy — it is evidence of how much has been checked — and the index would rather this page were longer than that it were empty.
| Date | Record or table | Field | Was | Now | Why |
|---|---|---|---|---|---|
| 2026-07-12 | AX-2026-041286 | lot | SSA26H4471 | SSA26H4417 | Transcription error at intake; digits transposed against the submitted certificate. The record was attached to a batch that does not exist and has been re-attached. |
| 2026-06-03 | batch rollups (14 records) | coa_divergence_pp | computed against the mean | computed against the median | Divergence was being computed against the mean of independent results on lots with three or more assays, contrary to what /suppliers/methodology/ stated. Fourteen batch pages changed by up to 0.08 pp. |
| 2026-04-21 | AX-2025-018884 | endotoxin_eu_mg | 11.4 | 1.14 | Decimal error transcribing a gel-clot result. The record had been flagged AX-R08 in error and the flag is withdrawn. |
| 2026-02-08 | compound registry — 3 compounds | mono_mass_da | average mass | monoisotopic mass | Three compounds carried an average mass in the monoisotopic field, producing apparent ppm errors of several hundred on every record referencing them. Twenty-two records had their AX-R01 flag withdrawn. |
| 2025-11-14 | AX-2025-018201 | sample_source | buyer-sourced | supplier-supplied | Submitter clarified that the vial was provided by the supplier rather than purchased. Reclassified, and the supplier scorecard recomputed. |
| 2025-09-02 | all quarterly aggregates | median_purity_pct | included method-limited records | excludes method-limited records | Records marked method-limited were being included in class aggregates, inflating incretin medians by an estimated 0.04 pp. The exclusion is now applied at aggregation. |
| 2025-05-27 | AX-2024-004902 | compound_slug | melanotan-ii | pt-141 | A unit-resolution identity confirmation had been recorded against the wrong member of a 1 Da pair. Re-assay at high resolution established the compound. The record now carries a note explaining why it could not have been distinguished originally. |
| 2025-03-19 | suppliers.csv | established | blank for 4 suppliers | populated | Four suppliers publish an establishment year that had not been transcribed. Populated from their own published material. |
| 2024-12-11 | AX-2024-004117 and 6 others | water_pct | as reported | as reported, flagged | Seven records reported water below 0.4 %, which is below the working limit of coulometric Karl Fischer for these sample sizes. Values retained, and a note added stating that they should be read as "below the limit of quantitation" rather than as measurements. |
| 2024-08-05 | peak tables — 31 records | largest_impurity_pct | unordered | ordered descending | Thirty-one peak tables listed impurities by retention time rather than descending area, so the first row was not the largest single impurity as the column header claimed. Re-ordered. |
How to report an error
Errors are reported the same way records are submitted — see the submission page. A useful report names the record ID, the field, what the value should be and how you know. The index will correct a demonstrated error in a published figure within a day and log it here.
What is not a correction
A disagreement between two laboratories is not an error and does not get corrected. It gets published on the batch page as a disagreement, because that is what it is. See the data policy on disputes.