Skin Prick Test Quiz

What is the primary mechanism of a skin prick test?

• Type II hypersensitivity reaction

• Type I (IgE-mediated) hypersensitivity reaction

• Type III immune complex reaction

• Type IV delayed-type hypersensitivity

• Non-immunologic histamine release

Which of the following medications should be discontinued before skin prick testing?

• ACE inhibitors

• Beta-blockers

• Antihistamines

• Proton pump inhibitors

• Calcium channel blockers

What is the minimum wheal size considered positive for a skin prick test?

• 1 mm diameter

• 2 mm diameter

• 3 mm diameter

• 5 mm diameter

• 10 mm diameter

The wheal formed immediately after TST injection should be:

• 2-4 mm diameter

• 6-10 mm diameter

• 10-15 mm diameter

• >15 mm diameter

• No wheal should be present

What is the optimal time to read skin prick test results?

• 5 minutes

• 10 minutes

• 15-20 minutes

• 30 minutes

• 1 hour

TST should be read at what time interval after administration?

• 24 hours

• 48 hours

• 48-72 hours

• 96 hours

• 1 week

Which condition is an absolute contraindication to skin prick testing?

• Mild eczema

• Pregnancy

• Recent anaphylaxis to the tested allergen

• Age under 6 months

• Current upper respiratory infection

Which of the following can cause false positive skin prick test results?

• Recent antihistamine use

• Dermographism

• Immunosuppressive therapy

• Beta-blocker medication

• Age over 65 years

Skin prick tests are most useful for diagnosing allergies to:

• Food additives

• Medications

• Environmental allergens (pollens, dust mites)

• Contact allergens

• All of the above equally

What should be immediately available during skin prick testing?

• Antihistamines only

• Topical corticosteroids

• Epinephrine and resuscitation equipment

• Bronchodilators

• Oral corticosteroids