In the evaluation of panic disorder, which laboratory tests would be most appropriate for a patient experiencing tachycardia and shortness of breath?

In the evaluation of panic disorder, particularly when a patient presents with symptoms like tachycardia and shortness of breath, it is crucial to rule out any underlying medical conditions that could mimic or exacerbate anxiety symptoms. The laboratory tests listed as the correct choice, which include thyroid-stimulating hormone, complete metabolic panel, and complete blood count, are highly relevant for this purpose.

The thyroid-stimulating hormone (TSH) test is important because hyperthyroidism can lead to symptoms such as anxiety, palpitations, and increased heart rate. The complete metabolic panel can provide information on electrolyte imbalances or kidney function that could also contribute to physiological symptoms. A complete blood count (CBC) can help identify anemia or infections that might be causing or contributing to the patient's distressing symptoms.

Using these tests helps ensure a comprehensive evaluation, as panic disorder might present similarly to other conditions, and it is vital to assess and rule out potential medical causes of the symptoms before attributing them solely to a psychiatric disorder. This approach enables a more accurate diagnosis and effective treatment plan for the patient.