Real ChatGPT answer · index seedolYlwnM30XYcompleteParenting and family · pregnancyinformational

What formula do doctors use to calculate an expected due date and can it change significantly during early ultrasounds

ChatGPTgpt-61 query11/1/2026
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The searches the AI actually ran for this prompt.

SEED QUERY
What formula do doctors use to calculate an expected due date and can it change significantly during early ultrasounds
1 real search · 1 real-search pass
ACOG methods for estimating due date first trimester ultrasound crown rump length discrepancy 5 days 7 days committee opinionGoogle ↗
OBSERVEDReason

Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.

Query classes

Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.

ChatGPT real searches (1)
Short factOther / navigationalComparisonConsequenceReason100%DefinitionInstructionYes / no

Classes come from the query-classifier (a local Laya model).

Searches and sources

ChatGPT1 real searches · gpt-6
ACOG methods for estimating due date first trimester ultrasound crown rump length discrepancy 5 days 7 days committee opinion Google ↗

Queries

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Query / typeSearchIntentQuery classRouting formatClusterFreq ↓Weight
ACOG methods for estimating due date first trimester ultrasound crown rump length discrepancy 5 days 7 days committee opinion
OBSERVED
Google ↗
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—Reason——1x
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