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Which of the following diagnostic tests is commonly performed to confirm the diagnosis of psoriasis?

A.

Skin patch testing for allergens

B.

Chest X-ray to assess lung involvement

C.

Complete blood count (CBC) to assess white blood cell count

D.

Skin biopsy to examine histological changes

Answer and Explanation

The Correct Answer is D

Explanation: A skin biopsy is commonly performed to confirm the diagnosis of psoriasis. It involves taking a small sample of skin tissue from a psoriatic plaque and examining it under a microscope to identify the characteristic histological changes, such as hyperkeratosis, parakeratosis, and elongation of the rete ridges.

Incorrect choices: a. Skin patch testing for allergens: Patch testing is used to diagnose allergic contact dermatitis, not psoriasis.

b. Chest X-ray to assess lung involvement: Chest X-rays are not necessary for the diagnosis of psoriasis, as it primarily affects the skin and joints, not the lungs.

c. Complete blood count (CBC) to assess white blood cell count: While a CBC may be performed to assess inflammation, it is not specific to psoriasis and cannot confirm the diagnosis. A skin biopsy is needed for definitive diagnosis.


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Related Questions

Correct Answer is A

Explanation

Explanation: Psoriasis commonly affects the scalp and nails in addition to other areas of the body. Scalp psoriasis can cause flaking and scale buildup on the scalp, while nail psoriasis can lead to pitting, discoloration, and thickening of the nails.

Incorrect choices: b. Buttocks and thighs: While psoriasis can occur in these areas, it is not one of the most common areas affected.

c. Lower back and shoulders: These areas can be affected by psoriasis, but they are not the most commonly affected regions.

d. Upper arms and neck: Psoriasis can occur on the upper arms and neck, but it is not the most frequently affected area.

Correct Answer is B

Explanation

Explanation: Petroleum-based ointments can help seal in moisture and soothe the skin, reducing itchiness and discomfort associated with psoriasis.

Incorrect choices: a. "Take long, hot showers to soothe the skin." - Hot showers can actually worsen psoriasis symptoms by drying out the skin. Patients should take short, lukewarm showers instead.

c. "Wear tight-fitting clothing to prevent skin irritation." - Tight-fitting clothing can rub against the skin and worsen psoriasis symptoms. Patients should wear loose, breathable clothing.

d. "Use scented moisturizers for a pleasant fragrance." - Scented moisturizers may contain ingredients that can irritate the skin and trigger flare-ups. Unscented or fragrance-free moisturizers are recommended.

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