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Summary Table

Category	Detail
Risk Factors	Maternal age >35, obesity, diabetes mellitus (pregestational and gestational), hypertensive disorders (preeclampsia, chronic hypertension), thrombophilias (antiphospholipid syndrome, Factor V Leiden), placental abruption, intrauterine growth restriction, multiple gestation, prior stillbirth, smoking, substance use, Rh isoimmunization, post-term pregnancy (>42 weeks)
Etiology	Placental insufficiency (most common identifiable cause), chromosomal abnormalities, congenital malformations, umbilical cord accidents, maternal infections (parvovirus B19, CMV, syphilis, listeria), fetomaternal hemorrhage, unexplained (~25-60% of cases)
Patient Presentation	Decreased or absent fetal movement reported by the mother, often in the second or third trimester. May also present with regression of pregnancy symptoms (breast tenderness fading, uterine size smaller than expected)
Classic Physical Exam	Absent fetal heart tones on Doppler auscultation, uterine size smaller than dates, absence of fetal movement on palpation. In prolonged retention: brownish amniotic fluid, signs of maceration at delivery
Key Diagnostic Results	Absent fetal cardiac activity on obstetric ultrasound (confirmatory). Spalding sign on X-ray (overlapping skull bones, historical). Labs: declining beta-hCG, falling hPL. Prolonged retention may show falling fibrinogen and rising fibrin degradation products (disseminated intravascular coagulation)
Management	Delivery is definitive management. Induction of labor with misoprostol or oxytocin depending on gestational age. Monitor for DIC with serial coagulation studies. Workup for cause of death after delivery (autopsy, placental pathology, karyotype, maternal labs)
Keywords	"Absent fetal movement," "no fetal heart tones," "absent cardiac activity on ultrasound," "Spalding sign," "coagulopathy after prolonged fetal retention," "consumptive coagulopathy"

1. Pathophysiology

Intrauterine fetal death is defined as the death of a fetus at or beyond 20 weeks of gestation (or weighing 350 grams or more if gestational age is unknown). Before 20 weeks, the event is classified as a miscarriage or spontaneous abortion, and this distinction is a frequently tested boundary.

The underlying mechanism varies by gestational age and etiology, but the final common pathway is cessation of fetal cardiac activity due to one or more insults. In many cases, the process begins with uteroplacental insufficiency, where the placenta fails to deliver adequate oxygen and nutrients to the fetus. Chronic hypoxia leads to progressive acidemia, redistribution of fetal blood flow (brain-sparing effect), and eventually irreversible myocardial failure. This is why many stillborn fetuses show evidence of intrauterine growth restriction on prior ultrasounds.

In cases driven by placental abruption, the mechanism is acute. Premature separation of the placenta from the uterine wall causes sudden loss of gas exchange, leading to rapid fetal asphyxia. The mother may present with vaginal bleeding, abdominal pain, and a rigid or tender uterus, but in concealed abruption, external bleeding may be absent while the fetus deteriorates.

Umbilical cord accidents (true knots, cord prolapse, nuchal cord with compression) interrupt blood flow mechanically. These events are often unpredictable and may account for a portion of otherwise unexplained fetal deaths.

Fetal infections cause death through direct tissue damage, myocarditis, hydrops fetalis, or severe anemia. Parvovirus B19 is particularly high-yield because it targets erythroid precursor cells, causing profound fetal anemia and nonimmune hydrops fetalis, which can progress to cardiac failure and death.

A critical concept for the exam is what happens when the dead fetus is retained in utero for a prolonged period (typically beyond 3 to 4 weeks). The retained dead fetal tissue releases thromboplastin into the maternal circulation, which activates the extrinsic coagulation cascade and consumes clotting factors and platelets. This produces a consumptive coagulopathy (DIC), manifesting with prolonged PT/PTT, decreased fibrinogen, elevated D-dimer, and thrombocytopenia. This is the reason why timely delivery is emphasized and why serial coagulation monitoring is essential once IUFD is diagnosed.

2. Classification and Clinical Manifestation

Classification	Gestational Age	Key Features
Early stillbirth	20 to 27 weeks	Often related to chromosomal abnormalities, congenital malformations, or infection. Fetus may show less maceration depending on interval between death and diagnosis
Late stillbirth	28 to 36 weeks	More commonly associated with placental insufficiency, preeclampsia, abruption, and growth restriction
Term stillbirth	37 weeks and beyond	May be related to cord accidents, post-term complications, undiagnosed diabetes, or unexplained causes. Carries the highest emotional impact and medicolegal scrutiny

Clinical Manifestation By Stage

Feature	Early Presentation	Prolonged Retention (>3-4 weeks)
Fetal movement	Absent or decreased	Absent
Uterine growth	May plateau or regress	Clearly smaller than dates
Fetal heart tones	Absent on Doppler	Absent
Amniotic fluid	May initially be normal	Decreased, may appear brownish
Maternal coagulation	Typically normal	Falling fibrinogen, rising D-dimer, prolonged PT/PTT (DIC)
Maternal symptoms	May report "something feels different," loss of breast tenderness	May develop bruising, bleeding from venipuncture sites, or mucosal bleeding if DIC develops

3. Diagnostic Workup

Test	Role	Key Findings
Obstetric ultrasound	Best initial test AND confirmatory test	Absent fetal cardiac activity. May also show absent fetal movement, overlapping skull bones, soft tissue edema, or gas in fetal vasculature in prolonged cases
Doppler auscultation	Initial bedside assessment	Absent fetal heart tones (but must be confirmed by ultrasound before diagnosis is made)
Coagulation panel (PT, PTT, fibrinogen, D-dimer, platelet count)	Screen for DIC	Prolonged PT/PTT, fibrinogen <200 mg/dL (critically low if <100), elevated D-dimer, low platelets
CBC	Baseline and monitoring	Anemia if abruption or DIC-related bleeding
Kleihauer-Betke test	Detect fetomaternal hemorrhage	Fetal red blood cells in maternal circulation; positive result suggests fetomaternal hemorrhage as a cause
TORCH panel, syphilis serology (RPR/VDRL), parvovirus B19 IgM/IgG	Infection workup	Positive titers suggest infectious etiology
Antiphospholipid antibody panel (lupus anticoagulant, anticardiolipin, anti-beta-2 glycoprotein I)	Thrombophilia screening	Positive results implicate antiphospholipid syndrome
Thyroid function tests, HbA1c, glucose	Maternal metabolic screening	Undiagnosed diabetes or thyroid disease
Fetal autopsy + placental pathology	Most important post-delivery investigation	Identifies cause of death in 30-50% of previously unexplained cases
Fetal karyotype	Chromosomal analysis	Aneuploidy, structural abnormalities

The workup proceeds in two phases. Phase one is confirming the diagnosis. When a mother reports decreased or absent fetal movement, the first step in any clinical setting is Doppler auscultation to assess for fetal heart tones. However, absence of heart tones on handheld Doppler alone is not sufficient to declare fetal death because of technical limitations (maternal habitus, early gestational age, device error). The diagnosis must be confirmed by real-time obstetric ultrasound demonstrating absence of fetal cardiac activity. This is the standard of care, and a vignette that describes absent Doppler tones should prompt you to select "confirm with ultrasound" as the next best step.

Phase two begins once IUFD is confirmed. The goals shift to (1) assessing maternal safety, particularly coagulation status, and (2) investigating the cause of fetal death. A baseline coagulation panel including fibrinogen, PT, PTT, D-dimer, and platelet count should be drawn immediately. If the fetus has been dead for a prolonged period or the duration is uncertain, this becomes urgent because DIC risk rises progressively. Fibrinogen is the single most useful marker: a level below 200 mg/dL is concerning, and below 100 mg/dL indicates severe DIC requiring correction before delivery.

The etiologic workup (Kleihauer-Betke, TORCH, thrombophilia panel, metabolic labs) is performed to guide counseling for future pregnancies. Fetal autopsy combined with placental pathology is the most informative investigation and should be offered to all parents, though consent is required.

4. Management and Treatment

Stage	Intervention	Details
Immediate after diagnosis	Baseline coagulation studies	PT, PTT, fibrinogen, D-dimer, CBC, type and screen
Delivery (first trimester-equivalent gestational age: 20-28 weeks)	Misoprostol (preferred)	200 to 400 mcg vaginally every 4 to 6 hours. Lower doses used closer to viability due to increased uterine sensitivity. May also use mifepristone 200 mg orally 24 to 48 hours before misoprostol to improve efficacy
Delivery (>28 weeks)	Oxytocin induction or low-dose misoprostol	Oxytocin per standard induction protocol (starting 1-2 mU/min, titrating). Misoprostol dose reduced to 25 to 50 mcg vaginally every 4 hours to reduce risk of uterine rupture, particularly if prior cesarean scar
If DIC is present	Correct coagulopathy BEFORE or DURING delivery	Cryoprecipitate (to replace fibrinogen, target >100 mg/dL), fresh frozen plasma (replaces all clotting factors), platelet transfusion if <50,000/microL
Rh-negative mother	Anti-D immunoglobulin (RhoGAM)	Administer within 72 hours. Standard dose 300 mcg IM. Perform Kleihauer-Betke to determine if additional doses are needed for large fetomaternal hemorrhage
Lactation suppression	Supportive measures or cabergoline	Cabergoline 1 mg orally as a single dose within 24 hours of delivery if lactation suppression desired. Tight-fitting bra and ice packs as supportive options
Psychosocial support	Bereavement counseling, memory-making	Offer to see and hold the baby, footprints, photographs. Refer for grief counseling
Postpartum etiologic workup	Autopsy, placental pathology, karyotype, maternal labs	As outlined in Section 3
Future pregnancy counseling	Based on identified etiology	Low-dose aspirin, heparin (if antiphospholipid syndrome), tighter glucose control (if diabetes), increased surveillance with serial ultrasounds and antenatal testing starting at 32 weeks or earlier

Delivery is the definitive treatment and should not be delayed unnecessarily, though it is not a surgical emergency (unlike placental abruption with hemodynamic instability, which would require emergent cesarean). The timing of delivery depends on maternal stability. If coagulation is normal, induction can proceed promptly. If DIC is present, correction of coagulopathy takes priority before proceeding with delivery to avoid catastrophic hemorrhage.

For pregnancies at 20 to 28 weeks, the cervix is often unfavorable and the uterus is less responsive to oxytocin, making misoprostol the preferred agent. It acts as a prostaglandin E1 analog that softens the cervix and stimulates uterine contractions. Pretreatment with mifepristone (a progesterone receptor antagonist) 24 to 48 hours before misoprostol shortens the induction-to-delivery interval and is recommended when available.

For pregnancies beyond 28 weeks, both oxytocin and low-dose misoprostol are options. The critical caution here is in women with a prior uterine scar (previous cesarean section). In these patients, misoprostol carries an increased risk of uterine rupture, and many guidelines recommend using oxytocin preferentially or using very low doses of misoprostol (25 mcg) with close monitoring. A vignette that features a woman with IUFD at 34 weeks and a prior cesarean scar is testing whether you recognize this contraindication.

Expectant management (waiting for spontaneous labor) is generally discouraged beyond a short period because of the cumulative risk of DIC. If the patient strongly desires to wait, serial coagulation studies (at least weekly fibrinogen levels) are mandatory.

An important exam point: cesarean delivery is rarely indicated for IUFD because the fetus is already dead, and subjecting the mother to major abdominal surgery provides no fetal benefit while adding maternal risk. Cesarean would be reserved for situations where vaginal delivery is contraindicated (e.g., complete placenta previa, prior classical cesarean incision).

5. Differential Diagnosis and Distractors

Differential Diagnosis	Why It Is Similar	Key Discriminator
Fetal sleep cycle / decreased fetal movement without demise	Mother reports reduced movement, raising concern for fetal distress	Ultrasound shows present cardiac activity and reactive nonstress test. In IUFD, cardiac activity is absent
Missed abortion (early pregnancy)	Also presents with absent fetal cardiac activity on ultrasound	Occurs at <20 weeks. Beyond 20 weeks, the correct term is intrauterine fetal death, not missed abortion. This is a definitional trap
Placental abruption (with live fetus)	Painful vaginal bleeding, uterine tenderness, and possible coagulopathy overlap with IUFD presentation	In abruption with a live fetus, fetal heart tones are still present (though possibly with decelerations). The management priority shifts to emergent delivery for fetal salvage, unlike IUFD where delivery timing is less urgent
Placenta previa	Painless vaginal bleeding in the third trimester	Previa presents with painless bleeding and a live fetus. No uterine tenderness. Diagnosed by ultrasound showing placental location over the internal os
Anencephaly or lethal congenital anomaly	Ultrasound may show severe abnormality that is ultimately incompatible with life	Fetus is still alive (cardiac activity present) at the time of diagnosis. The distinction is that lethal anomalies are diagnosed prenatally but the fetus has not yet died
Normal intrauterine pregnancy with faulty Doppler reading	Absent heart tones on Doppler	This is why ultrasound confirmation is mandatory before diagnosing IUFD. A negative Doppler finding alone is insufficient

6. Traps and High-Yield Pearls

The most common way students lose points on IUFD questions is by jumping to delivery before confirming the diagnosis with ultrasound. A vignette describing absent fetal heart tones on Doppler is deliberately testing whether you will select "obtain obstetric ultrasound" rather than "begin induction of labor." The handheld Doppler finding is a screening observation, not a definitive diagnosis.

The second major trap involves prolonged fetal retention and DIC. The vignette will describe a woman who was diagnosed with fetal demise days to weeks ago and now presents with easy bruising, oozing from IV sites, or abnormal bleeding. Students who do not recognize this as consumptive coagulopathy from retained dead fetal tissue will miss the need to correct the coagulopathy before or during delivery. Selecting "proceed with induction" without addressing the DIC is the intended wrong answer.

A third trap targets the distinction between IUFD and missed abortion. If the gestational age is given as 18 or 19 weeks with absent cardiac activity, the answer is missed abortion, not IUFD. Test-writers use borderline gestational ages to test whether you know the 20-week cutoff.

Finally, remember that cesarean delivery is almost never the correct answer for IUFD unless there is a clear maternal indication (e.g., complete previa, prior classical incision). The vignette may tempt you with urgency language, but the fetus is already dead, and vaginal delivery is strongly preferred to minimize maternal morbidity. The core competency being tested across all IUFD questions is this: confirm before you act, assess maternal safety (coagulation), deliver vaginally, and investigate the cause.

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