I’m unsure whether this is shingles—what tests should I undergo?

Herpes zoster is an infectious skin disease. Following its onset, timely and thorough evaluation is essential. But what laboratory tests should be performed if herpes zoster is suspected but not yet confirmed?

Which laboratory tests should be performed when herpes zoster is suspected?

Patients suspected of having herpes zoster should undergo a complete blood count (CBC) to assess whether the white blood cell (WBC) count is decreased. Viral infections—including varicella-zoster virus (VZV)—can cause leukopenia. Additionally, liver and renal function tests are recommended. If abnormalities in hepatic or renal function are detected, medications with significant adverse effects should be avoided. Tumor markers should also be evaluated, as some patients with herpes zoster—particularly those with atypical or recurrent presentations—may have an underlying malignancy. Appropriate ancillary examinations—including abdominal color Doppler ultrasound and plain abdominal radiography—may therefore be warranted. However, all diagnostic and therapeutic decisions must be made under the guidance of a qualified physician.

Herpes zoster is an acute infectious dermatosis caused by reactivation of the varicella-zoster virus (VZV). Its hallmark features include sudden onset, grouped vesicles distributed unilaterally along a dermatomal pattern, and frequently associated neuralgia and regional lymphadenopathy.

Prior to rash development, patients often experience prodromal symptoms such as low-grade fever, fatigue, malaise, and anorexia. Localized neuralgia and cutaneous hypersensitivity commonly precede the appearance of skin lesions. The initial skin changes typically manifest as irregular erythematous patches, followed rapidly by clusters of pinpoint-to-pea-sized red papules and papulovesicles that evolve into clear fluid-filled vesicles. Lesions characteristically follow a unilateral, dermatomal distribution and are often accompanied by regional lymphadenopathy. We hope this information has been helpful. Wishing you good health and happiness!