Wrong dates and lost negatives: 2 errors a read-through misses
Answer in brief: dates go wrong because 1 page can carry 6 or more dates and only the date of service places the event; negatives and hedges go wrong because a summary keeps the finding and drops the word that qualified it. Both errors read as plausible, so find them by searching for cues rather than by rereading.
Limits: We can't vouch for any tool's error rate on your files: the studies we cite measured other tasks and other models, and vendor features are as each vendor's site stated on the capture date.
The 12 dates a record can carry
A tool that reads "the date on the page" will often read the wrong one. Outside records arrive faxed, printed from 1 EHR and scanned into another, so the dates stack up. This table lists what each date means and what it is good for.
| Date | Where it appears | What it marks | Use it to place the event? |
|---|---|---|---|
| Date of service | Note header, "DOS", "visit date" | When the encounter happened | Yes, for visits |
| Admission and discharge dates | Hospital face sheet, discharge summary | The span of a stay | Yes, for the stay; events inside it have their own dates |
| Date of injury, as reported | History of present illness, claim forms | What the patient or form says | Only as a report; it can differ between sources |
| Order date | Orders, referrals | When a test or consult was ordered | For the order only, never for the result |
| Specimen collection date | Lab report | When blood or tissue was taken | Yes, for what the value reflects |
| Result or report date | Lab and imaging reports | When the result was available | For what was known when |
| Imaging exam date | Radiology header | When the images were taken | Yes, for the study |
| Dictation and transcription dates | Note footer, "D:" and "T:" | When the note was spoken and typed | No |
| Signature date | "Electronically signed", "authenticated" | When the author signed | No; late signing is common |
| Addendum date | "Addendum" block inside a note | When text was added later | For the added text only |
| Print or release date | Page footer, "printed on" | When the record was produced | No |
| Fax or transmission date | Top or bottom line of the page | When the page was sent | No |
Field guide compiled by medicalrecordssummaryai.com, 2026-11-12. Labels vary by EHR and facility; read the header, not the position on the page.
5 rules for dates in a summary you will sign
- Each event takes the date of service, the exam date or, for labs, the collection date. State the result date too when the question is what was known when.
- A signature, dictation, print or fax date never places an event. If the summary shows a visit on the same day as a fax header, check it.
- An addendum has its own date. Text added a week later wasn't known at the visit, and in a standard-of-care review that difference can decide the case.
- Duplicate copies of 1 note often carry different fax and print dates. 2 visits a few days apart with identical text are usually 1 visit.
- When sources disagree on the date of injury, the summary should show both with their pages, not pick 1.
Lost negatives: the cue words to search for
A negative finding is still a finding. "No loss of consciousness" and "straight leg raise negative" carry weight in a causation opinion, and they are the words a summary drops. In the largest annotated study of AI clinical notes, 30% of hallucinated sentences were negations (Asgari, npj Digital Medicine, 2025).
| Cue | Source wording | Lost-negative summary |
|---|---|---|
| denies, denied | Denies numbness or tingling. | Numbness and tingling. |
| no, not, none | No acute fracture or dislocation. | Acute fracture noted. |
| negative, neg | Neer test negative on the left. | Positive impingement signs. |
| without, w/o | Full ROM without pain. | Painful ROM. |
| absent, free of, unremarkable | Reflexes unremarkable. | Abnormal reflexes. |
| ruled out | DVT ruled out by duplex. | DVT. |
Watch for words that look like negation but aren't: "no change" and "no new complaints" negate a change, not a finding; "not only" adds; "denied" in "claim denied" is about payment. A careful check reads the whole sentence.
Hedges: the certainty ladder a summary flattens
Clinical notes grade certainty. A summary that keeps the diagnosis and drops the grade changes when the diagnosis was made. The most common trap is the pair "rule out" and "ruled out": the first means the diagnosis is being considered, the second means it was excluded.
| Source says | Meaning | Safe summary wording |
|---|---|---|
| Diagnosis stated plainly | Made | Diagnosed with X (page) |
| probable, likely, consistent with | Favored, not confirmed | Probable X (page) |
| possible, cannot exclude, suspicious for, concern for, questionable | Considered | Possible X (page) |
| r/o X, rule out X, X vs Y | Being worked up | Work-up for X ordered (page) |
| unlikely, doubt | Disfavored | X considered unlikely (page) |
| ruled out, excluded, negative for | Excluded | X excluded by test (page) |
Certainty ladder compiled by medicalrecordssummaryai.com, 2026-11-12, for summary wording. It is not a coding standard; coding rules for uncertain diagnoses differ by setting.
Search strings to copy
Paste these into the search box of your PDF reader or review tool. Run each list on the source, then check the matching lines in the summary. The regular expressions work in tools that support them; the plain lists work anywhere, 1 word at a time.
Negation cues
denies | denied | no | not | none | negative | neg | without | w/o | absent | free of | unremarkable | ruled out | excluded Regex: \b(denie[sd]|no|not|none|negative|neg|without|w/o|absent|free of|unremarkable|ruled out|excluded)\b
Hedge cues
r/o | rule out | possible | probable | likely | unlikely | cannot exclude | can't exclude | suspicious for | concern for | questionable | vs | versus | consistent with | doubt Regex: \b(r/o|rule out|possibl[ey]|probabl[ey]|(un)?likely|cannot exclude|can't exclude|suspicious for|concern for|questionable|vs\.?|versus|consistent with|doubt)\b
Date cues
DOS | date of service | collected | resulted | reported | dictated | transcribed | signed | addendum | printed | fax | received Regex: \b(DOS|date of service|collected|resulted|reported|dictated|transcribed|e-?signed|signed|addendum|printed|fax|received)\b
Questions about dates and negatives
Which date should an AI summary use for a lab result?
The specimen collection date for what the value reflects, and the result date for when it was known. Never the fax, print or signature date. If the summary shows only 1 date, check which one it took.
What is the difference between "rule out" and "ruled out"?
"Rule out X" means X is being considered and a work-up is under way. "Ruled out" means X was excluded. A summary that writes "rule out" as a diagnosis, or merges the 2, changes the clinical picture.
How do I find lost negatives without rereading the whole file?
Search the source for the negation cues above, keep the hits on findings your opinion rests on, and check that the summary states each as negative. On a typical file that is a short list.