Exact definition of IUFD and still birth?

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IUFD intrauterine fetal death stillbirth definition WHO gestational age weight

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IUFD (Intrauterine Fetal Death) vs. Stillbirth - Exact Definitions

These two terms are closely related and often used interchangeably, but they have distinct definitions depending on the authority/context.

1. IUFD - Intrauterine Fetal Death

IUFD refers to death of a fetus within the uterus before complete expulsion or extraction from its mother. It is a broad clinical/pathological term describing the event, not a legal or registration term.

The most widely cited broad definition comes from the WHO:

"Death before the complete expulsion or extraction from its mother of a product of conception, irrespective of the duration of pregnancy; the death is indicated by the fact that after such separation, the fetus does not breathe or show any other evidence of life, such as a heartbeat, pulsation of the umbilical cord, or definite movement of voluntary muscles."

This definition covers all fetal deaths from any gestational age (including what would otherwise be called miscarriage/spontaneous abortion at earlier gestation).

Note: "Stillbirth" has largely replaced "intrauterine fetal demise/death" as the preferred terminology based on parent group consensus and is increasingly used in its place.

2. Stillbirth - Definitions by Authority

There is no single universal definition - it varies by country and organization:

Authority	Gestational Age	Weight	Additional Criteria
WHO (Global/International)	≥ 28 weeks	≥ 1000 g	Crown-heel length ≥ 35 cm; no signs of life at birth
USA (ACOG / NCHS)	≥ 20 weeks	≥ 350 g (if GA unknown)	No signs of life (no breathing, heartbeat, cord pulsation, voluntary movement)
UK / England (Legal)	> 28 weeks (historically)	-	Not breathe or show any other sign of life after complete expulsion from mother
India / FOGSI	≥ 28 weeks	≥ 1000 g	No signs of life at birth

Textbook Quotes:

Pye's Surgical Handicraft: "The definition of a stillborn child is a child which has been born after the 28th week of pregnancy and which did not, after having been completely expelled from its mother, breathe or show any other sign of life."
Creasy & Resnik's Maternal-Fetal Medicine: "Stillbirth, defined as fetal death at 20 weeks' gestation or more, occurs in 1 of 165 pregnancies (21,500 stillbirths per year) in the United States."

3. Classification of Stillbirths

Stillbirths are further classified into:

Type	Definition
Fresh / Intrapartum stillbirth	Occurs after onset of labor, <12 hours before delivery; no skin changes; weight >1000 g; >28 weeks
Macerated / Antepartum stillbirth	Death occurred before onset of labor; fetus shows maceration changes - skin discoloration, peeling, breakdown due to retention in utero

4. Key Distinction: IUFD vs. Stillbirth vs. Abortion

Term	Gestational Age
Spontaneous abortion / Miscarriage	< 20 weeks (USA) or < 28 weeks (WHO)
IUFD	Any gestational age (broad term; death in utero)
Stillbirth	≥ 20 weeks (USA) or ≥ 28 weeks (WHO/India) - legal/statistical term

The cut-off of 350 g used by the USA represents the 50th percentile weight at 20 weeks gestation.

Summary

IUFD = clinical term for any fetal death in utero, irrespective of gestational age
Stillbirth = the legal/statistical term for fetal death at or beyond a defined threshold:
- ≥ 28 weeks / ≥ 1000 g (WHO, India, UK traditionally)
- ≥ 20 weeks / ≥ 350 g (USA/ACOG)
Both require absence of all signs of life after delivery (no breathing, heartbeat, cord pulsation, or voluntary movement)

Sources: - Creasy & Resnik's Maternal-Fetal Medicine, p. 1013 | Pye's Surgical Handicraft, p. 17 | ACOG Stillbirth Management Guidelines | StatPearls - Stillbirth | FOGSI Prevention and Management of Stillbirths

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