A 31-year-old woman presents with a history of two prior miscarriages; testing shows antiphospholipid antibodies. What is the most likely diagnosis?

1. A

   Antiphospholipid syndrome

2. B

   Thyroid disorder

3. C

   Cervical insufficiency

4. D

   Chromosomal abnormality in the fetus

Appeared in: NORCET 9 Mains - 2025

Explanation

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• The patient's history of two prior miscarriages meets the clinical criterion of recurrent pregnancy loss for Antiphospholipid Syndrome (APS).
• The positive test for antiphospholipid antibodies fulfills the laboratory criterion required for an APS diagnosis.
• APS is a well-established autoimmune cause of recurrent pregnancy loss, where autoantibodies lead to placental dysfunction and thrombosis.
• The combination of both the clinical history and the specific lab finding makes APS the most direct and likely diagnosis.

Why Other Options Were Wrong

• Option B: While thyroid disorders can cause miscarriages, they are not associated with the specific finding of antiphospholipid antibodies. The positive antibody test points directly to an autoimmune cause (APS) rather than an endocrine one.
• Option C: Cervical insufficiency is an anatomical problem characterized by painless cervical dilation, which typically leads to pregnancy loss in the second trimester, not recurrent first-trimester miscarriages.
• Option D: Chromosomal abnormalities are the most frequent cause of single, sporadic miscarriages. However, when a patient experiences recurrent losses, an underlying maternal factor like APS is a more probable cause, especially when confirmed by a specific lab test.

Related Visual

• Visual 1: Flowchart - A diagnostic flowchart for Antiphospholipid Syndrome, showing how the combination of clinical criteria (thrombosis or pregnancy morbidity) and laboratory criteria (positive antibody tests) leads to a diagnosis.
• Visual 2: Infographic - An infographic illustrating the pathophysiology of APS in pregnancy, showing how antibodies can lead to placental thrombosis and impaired fetal development.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Diagnosis of Antiphospholipid Syndrome (APS) based on clinical history and laboratory findings to guide bedside assessment, documentation, and the next nursing action.
• Identifying APS is critical because treatment with low-dose aspirin and heparin during future pregnancies can significantly increase the live birth rate from less than 20% to over 70%.
• A diagnosis of APS has lifelong implications, as it places the patient at a significantly higher risk for arterial and venous thrombosis, such as deep vein thrombosis (DVT), pulmonary embolism, stroke, and heart attack.
• Nursing care involves patient education about the signs of thrombosis, the importance of adherence to anticoagulant therapy, and the need for close monitoring during pregnancy.

How to Approach the Question

• First, analyze the patient's key information provided in the question stem: age (31), clinical history (two prior miscarriages), and a specific laboratory finding (positive antiphospholipid antibodies).
• Recognize that 'two prior miscarriages' constitutes recurrent pregnancy loss (RPL), a significant clinical sign.
• Connect the clinical history (RPL) with the specific lab result (antiphospholipid antibodies). This combination is a classic diagnostic pattern.
• Evaluate the options. Antiphospholipid syndrome is defined by the presence of both clinical criteria (like RPL) and laboratory criteria (the antibodies), making it a perfect match.
• Systematically rule out the other options. Thyroid disorders don't produce these specific antibodies. Cervical insufficiency presents differently (second-trimester loss). Chromosomal issues are more common in sporadic, not recurrent, loss.

Concept Tested & Keywords

• Concept Tested: Diagnosis of Antiphospholipid Syndrome (APS) based on clinical history and laboratory findings.
• Stem keywords: 31-year-old woman, two prior miscarriages, antiphospholipid antibodies
• Lead-in keywords: most likely diagnosis
• Clinical cues: The combination of recurrent pregnancy loss and a specific positive autoantibody test is a classic presentation for an autoimmune condition affecting pregnancy.

Question ID

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