Estimated date of delivery¶

Estimate a pregnancy's delivery date by anchoring gestational age to the best available menstrual, conception, or ultrasound evidence and retaining the estimate unless a documented redating threshold is crossed.

Version: v1 · 2026-09-08 · History
Domain-specific #: 4422
Origin domain: obstetrics
Subdomain: pregnancy dating
Aliases: Estimated due date, Expected date of confinement, EDD

Core Idea¶

The estimated date of delivery (EDD) is the calendar date corresponding to the clinical estimate of 40 weeks' gestation, derived from the best supported gestational-age origin rather than a prediction of the exact birth day. A last-menstrual-period date supplies an initial convention; known fertilization or embryo-transfer dates can anchor conception more directly; early ultrasound biometry estimates gestational age. Clinical rules reconcile discrepancies and document any redating. The abstraction is therefore identified by a declared carrier, a transformation or constraint over that carrier, and an invariant that tells an analyst whether the named structure is genuinely present.

Scope of Application¶

Estimated date of delivery belongs to obstetrics and is useful where the analyst can specify a pregnancy, a gestational-age origin, menstrual or assisted-conception dates, ultrasound biometric observations, dating rules, and uncertainty, then evaluate the EDD is derived from one documented dating origin and guideline, with cycle assumptions, scan timing, uncertainty, and any redating decision explicit. The scope is broad within that domain but bounded by the need for the EDD is derived from one documented dating origin and guideline, with cycle assumptions, scan timing, uncertainty, and any redating decision explicit. This entry describes a clinical dating abstraction, not individual medical advice. Actual delivery commonly differs from the EDD; clinical interpretation and redating follow professional guidance and patient-specific evidence.

Clarity¶

The abstraction clarifies a crowded vocabulary by making the EDD is derived from one documented dating origin and guideline, with cycle assumptions, scan timing, uncertainty, and any redating decision explicit the center of the account. A claim should name the carrier, the governing operation or relation, the applicable assumptions, and the recognition test. A bare label is insufficient because the name Estimated date of delivery can be used for a formal identity, an implementation, or a neighboring result unless carrier and convention are stated.

Manages Complexity¶

Without the abstraction, an analyst must reason directly over many local details: the carrier roles, admissibility assumptions, competing conventions, derived invariants, boundary cases, and proof or validation obligations specific to Estimated date of delivery. Estimated date of delivery compresses them into the roles in the structural signature. That compression permits comparison across instances without erasing the variables that determine validity. It also exposes which details may be varied safely and which are constitutive.

Abstract Reasoning¶

Identify the carrier. State what the elements, states, objects, or observations are: a pregnancy, a gestational-age origin, menstrual or assisted-conception dates, ultrasound biometric observations, dating rules, and uncertainty. Reject examples whose alleged carrier belongs to a different problem. 2. Lock the constitutive rule. Express the EDD is derived from one documented dating origin and guideline, with cycle assumptions, scan timing, uncertainty, and any redating decision explicit independently of one notation or implementation.

Knowledge Transfer¶

Knowledge transfers strongly among subfields of obstetrics because they reuse a pregnancy, a gestational-age origin, menstrual or assisted-conception dates, ultrasound biometric observations, dating rules, and uncertainty, A last-menstrual-period date supplies an initial convention; known fertilization or embryo-transfer dates can anchor conception more directly; early ultrasound biometry estimates gestational age. Clinical rules reconcile discrepancies and document any redating., and type the carrier, state every parameter and convention in the definition, test that the EDD is derived from one documented dating origin and guideline, with cycle assumptions, scan timing, uncertainty, and any redating decision explicit, compare the nearest accepted identity, and report counterexamples, uncertainty, and limiting cases.

Relationships to Other Abstractions¶

Current abstraction Estimated date of delivery Domain-specific

Parents (1) — more general patterns this builds on

Estimated date of delivery is a kind of Measurement Prime

The proposed strict upward parent is prime:measurement.

Hierarchy path (1) — routes to 1 parentless root

Estimated date of delivery → Measurement

Neighborhood in Abstraction Space¶

Estimated date of delivery sits in a sparse region of the domain-specific corpus (71^st percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.

Family — Population Aging & Intergenerational Welfare (10 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-09-08