Pregnancy Dating — FHIR Questionnaire Template

Last menstrual period and visit date with the expected delivery date (Naegele) and gestational age in weeks.

Scoring

Calculated values only; each result stays empty until all of its inputs are answered.

Questions

1. First day of last menstrual period
2. Visit date

Calculated results

• Expected delivery date
• Gestational age (completed weeks)

Source and license

Source: Naegele's rule, 280-day form (regular 28-day cycle); Standard LMP dating (completed weeks since the first day of the last period). Codes: LOINC.

License: Original wording written for this builder; covered by the project license (non-commercial use with attribution; commercial use needs written permission). Formulas are published methods; see the source. (link)

Provided to save authoring effort, not as medical advice — confirm the scale and its cut-offs for your use case.

Use it

1. Download the FHIR Questionnaire JSON, or
2. open the Builder, choose + Add → From template…, search for “Pregnancy Dating” and insert it. It arrives as one titled group with its calculations wired, and you can keep editing it.

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This material contains content from LOINC (loinc.org). LOINC is copyright © Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the LOINC license.