A pregnant client at 28 weeks gestation is admitted with placental abruption and develops disseminated intravascular coagulation (DIC). Which laboratory finding would be most indicative of DIC in this client?
1Elevated fibrinogen levels and decreased platelet count
2Normal prothrombin time (PT) and elevated D-dimer
3Decreased fibrinogen levels and elevated fibrin degradation products (FDPs)✓ 정답
4Increased platelet count and prolonged partial thromboplastin time (PTT)
해설
DIC involves consumption of clotting factors and fibrinolysis, leading to decreased fibrinogen and elevated FDPs. Other options do not reflect the characteristic lab abnormalities of DIC.
Understanding the Pathophysiology of DIC in Placental Abruption
When a placental abruption occurs, the protective barrier between maternal circulation and the placenta is disrupted. This exposes maternal blood to large amounts of tissue factor (thromboplastin) from the damaged decidua and placental tissue. This event triggers a massive, systemic activation of the coagulation cascade, the hallmark of disseminated intravascular coagulation (DIC). The body's clotting system goes into overdrive, forming widespread microthrombi in the vasculature. This process rapidly consumes clotting factors and platelets faster than the liver and bone marrow can produce them, paradoxically leading to a severe bleeding tendency [3].
Interpreting the Laboratory Hallmarks of DIC
The diagnosis of DIC is not based on a single test but on a pattern of laboratory abnormalities reflecting this consumption coagulopathy. The most indicative finding in this scenario is a combination of decreased fibrinogen and elevated fibrin degradation products (FDPs).
Fibrinogen is a soluble clotting factor (Factor I) that is converted into insoluble fibrin to form a stable clot. In DIC, the widespread formation of microthrombi leads to a massive consumption of fibrinogen, causing its plasma level to fall significantly. A low fibrinogen level is a critical marker of consumption and is directly linked to bleeding risk in obstetric DIC [2].
Simultaneously, the body attempts to dissolve these widespread clots by activating the fibrinolytic system. Plasmin breaks down the fibrin clots into fragments known as fibrin degradation products (FDPs), which include D-dimer. The laboratory finding of elevated FDPs or D-dimer provides direct evidence of both active clot formation and subsequent fibrinolysis [2, 3]. The combination of a depleted clotting factor (low fibrinogen) and the byproducts of clot breakdown (high FDPs) is a classic and specific laboratory picture for acute, consumption-driven DIC.
Why the Other Options Are Incorrect
- Option 1: Elevated fibrinogen levels and decreased platelet count. Fibrinogen is an acute-phase reactant and can be elevated in normal pregnancy. However, in acute DIC, the defining feature is the consumption and subsequent depletion of fibrinogen, not an elevation. While a decreased platelet count is consistent with DIC, an elevated fibrinogen level contradicts the diagnosis of an active consumptive process [3].
- Option 2: Normal prothrombin time (PT) and elevated D-dimer. The prothrombin time (PT) measures the extrinsic and common coagulation pathways. In DIC, the consumption of multiple coagulation factors (like Factors V, VII, X, and prothrombin) invariably leads to a prolonged PT. A normal PT would be an unusual finding in a significant consumptive coagulopathy and does not align with the expected laboratory profile [2].
- Option 4: Increased platelet count and prolonged partial thromboplastin time (PTT). DIC is characterized by thrombocytopenia (a decreased platelet count) due to their consumption in widespread microthrombi. An increased platelet count is not a feature of DIC. While a prolonged partial thromboplastin time (PTT) is expected as intrinsic pathway factors are consumed, the incorrect platelet count makes this option invalid [3].
References (research sources)
[2]
Quantitative Evaluation of Coagulability in Obstetric DIC Using TEG6s for New Japanese Diagnostic Criteria of Obstetrical Disseminated Intravascular Coagulation.Research articleMatsunaga S, Nakamura E, Takai Y, Itakura A, Perinatal committee of the Japanese Society of Obstetrics and Gynecology. (2026) · DOI: 10.1111/jog.70188
[3]
Revisiting the Concept of DIC: A Phenotype-guided Framework for Modern Hemostatic Medicine.Research articleCrochemore T, Scarlatescu E. (2026) · DOI: 10.14789/ejmj.jmj25-0066-r
Clinical Management of DIC in Placental Abruption
When a pregnant client at 28 weeks presents with placental abruption and suspected DIC, immediate multidisciplinary intervention is critical. The priority is to manage the underlying cause—delivery of the fetus and placenta—while simultaneously correcting the coagulopathy to prevent life-threatening hemorrhage.
Key Interventions
Fetal & Maternal Stabilization: Initiate continuous fetal and maternal monitoring. Administer oxygen and maintain left lateral tilt to maximize uteroplacental perfusion. Prepare for emergent cesarean delivery if fetal distress or maternal instability is present.
Volume Resuscitation: Secure large-bore intravenous access. Initiate crystalloid fluid resuscitation to maintain hemodynamic stability and urine output. Avoid hypotonic solutions.
Blood Product Replacement: Transfuse based on laboratory values and clinical bleeding, not solely on lab numbers. Packed red blood cells maintain oxygen-carrying capacity. Fresh frozen plasma (FFP) replaces consumed clotting factors. Cryoprecipitate is rich in fibrinogen and is often required when fibrinogen levels drop below 100-150 mg/dL. Platelet transfusions are indicated for counts below 50,000/µL or active bleeding.
Serial Lab Monitoring: Monitor complete blood count, PT/INR, aPTT, fibrinogen, and D-dimer/FDPs every 4-6 hours to guide transfusion therapy. A decreasing fibrinogen level is a key indicator of ongoing consumption and bleeding risk.
Uterine Atony Prevention: After delivery, anticipate and aggressively manage postpartum hemorrhage. Administer uterotonics (oxytocin, methylergonovine, carboprost) as ordered. Uterine massage and bimanual compression may be necessary.
Nursing Considerations
Assess for signs of bleeding: oozing from IV sites, petechiae, hematuria, and expanding abdominal girth. Strictly monitor intake and output. Provide emotional support to the client and family, explaining procedures clearly. Document all blood products administered and the patient's response to therapy.
Disseminated Intravascular Coagulation (DIC) — An acquired syndrome characterized by systemic activation of coagulation, leading to widespread microthrombi formation and consumption of platelets and clotting factors, resulting in bleeding.
Fibrinogen — A soluble plasma glycoprotein (Factor I) synthesized by the liver that is converted by thrombin into fibrin during blood clot formation. Levels are decreased in DIC due to consumption.
Fibrin Degradation Products (FDPs) — Fragments produced when plasmin breaks down fibrin clots during fibrinolysis. Elevated levels indicate active clot formation and breakdown, a hallmark of DIC.
Placental Abruption — Premature separation of the placenta from the uterine wall before delivery, which can release thromboplastin into maternal circulation and trigger DIC.
Consumption Coagulopathy — A pathological state where excessive activation of the coagulation cascade depletes clotting factors and platelets, leading to a paradoxical bleeding tendency, as seen in DIC.