[When D-dimers within normal limits do not equate to normal D-dimers].

Area of Science:

• Medical Diagnostics
• Cardiology
• Pulmonology

Background:

• Pulmonary embolism (PE) diagnosis is often complicated by nonspecific clinical presentations.
• Accurate and timely diagnosis of PE is crucial due to available effective treatments and potential fatality.
• Clinical decision rules and scoring systems aid diagnosis but cannot replace clinical judgment.

Purpose of the Study:

• To investigate diagnostic approaches for pulmonary embolism (PE) in patients with normal D-dimer levels but high clinical suspicion.
• To address the challenge of missed PE diagnoses when standard laboratory markers are incongruent with clinical presentation.

Main Methods:

• Review of diagnostic algorithms for pulmonary embolism.
• Analysis of clinical scenarios where D-dimer results contradict clinical suspicion.
• Evaluation of alternative diagnostic strategies beyond D-dimer testing.

Main Results:

• Normal D-dimer levels can be observed in patients with confirmed pulmonary embolism.
• Clinical gestalt and risk stratification scores remain vital in guiding further diagnostic steps.
• Imaging modalities like CT pulmonary angiography are essential when clinical suspicion is high despite negative D-dimer.

Conclusions:

• Clinical suspicion should guide the diagnostic pathway for pulmonary embolism, even with normal D-dimer results.
• A normal D-dimer does not exclude pulmonary embolism in high-risk patients.
• Integrating clinical judgment with appropriate imaging is key to avoiding missed pulmonary embolism diagnoses.