allergy screening test preparation

Overview

Allergy screening tests help find out what substances (allergens) may be causing your allergic reactions. These tests are usually done on your skin or through a blood sample. Preparing properly helps ensure accurate results.

Yes, allergy testing is a routine procedure done in clinics and hospitals around the world.

Anyone with suspected allergies — from children to older adults — may be advised to have an allergy screening test. It is especially common if symptoms are ongoing or severe.

Symptoms

Common symptoms

• Sneezing, runny or stuffy nose
• Itchy, watery eyes
• Skin rashes or hives
• Coughing or wheezing

Symptoms in children

• Frequent ear infections
• Chronic nasal congestion
• Eczema that does not improve with treatment

Symptoms in older adults

• Worsening of asthma or COPD
• New-onset sneezing or runny nose
• Unexplained fatigue or poor sleep due to allergy symptoms

Causes

Main causes

• Allergies occur when your immune system overreacts to a harmless substance like pollen, dust mites, pet dander, or certain foods.
• Genetics play a role — allergies often run in families.

Risk factors

• Having asthma or eczema
• Family history of allergies
• Exposure to allergens early in life

When to see a doctor

See a doctor urgently if:

• If you have a severe allergic reaction (anaphylaxis) — call emergency services.
• If you develop sudden breathing trouble after eating or exposure.

Book a routine appointment if:

• If you have regular allergy symptoms that affect your quality of life (like constant sneezing, itchy eyes, or skin rashes).
• If over-the-counter allergy medicines are not working well.
• If you want to identify specific triggers to avoid them.

Diagnosis

An allergy specialist (allergist) will review your symptoms, medical history, and perform tests to identify allergens.

Tests that may be done

• Skin prick test — small drops of allergens are placed on your forearm or back, then the skin is lightly pricked. Redness or swelling indicates an allergy.
• Blood test (specific IgE test) — a sample of your blood is sent to a lab to measure antibodies to specific allergens.
• Patch test — used for contact dermatitis. Patches with allergens are taped to your skin for 48 hours to see if a reaction develops.

What to expect at your appointment

Before the test, your doctor will ask about medicines you take. You may need to stop antihistamines (allergy medicines) for a few days. The skin test takes about 20–30 minutes. Results are usually ready within a day for blood tests, or 15–20 minutes for skin tests.

Treatment

Treatment for allergies focuses on avoiding triggers and managing symptoms. After testing, your doctor will help create a plan tailored to you.

Self-care at home

• Avoid known allergens (e.g., keep windows closed during high pollen seasons, use dust mite covers on pillows and mattresses).
• Rinse your nose with a saline (salt water) spray to clear allergens.
• Use a cool compress on itchy skin rashes.

Medical treatments

Doctors may recommend non-drowsy antihistamine tablets, nasal steroid sprays, or eye drops to control symptoms. For severe allergies, allergen immunotherapy (allergy shots or tablets) may be offered to help your body become less sensitive. Always follow your doctor's instructions — do not change or stop medicines without consulting them.

When is surgery considered?

Surgery is not used for allergies. In very rare cases, if nasal polyps or sinus issues are severe, an ENT specialist might discuss surgery, but this is unrelated to allergy testing.

Living with this condition

Living with allergies means being aware of your triggers and taking steps to avoid them. Keep a diary of your symptoms and possible exposures to help identify patterns.

Lifestyle tips

• Check pollen forecasts and plan outdoor activities when counts are lower.
• Vacuum and dust your home regularly, using a HEPA filter if possible.
• Wash bedding in hot water weekly to reduce dust mites.
• Keep pets out of the bedroom if you are allergic to pet dander.

Diet and exercise

If you have food allergies, read food labels carefully and inform restaurant staff. Exercise is generally safe, but if you have allergic asthma, warm up slowly and avoid exercising outdoors when pollen counts are high. Carry your emergency medication as advised.

Mental health and emotional wellbeing

Living with allergies can be stressful, especially if reactions are severe. It is normal to feel anxious or frustrated. Talk to your doctor if allergies are affecting your mood or daily life. Support groups and counseling can help.

Prevention

Allergies themselves cannot always be prevented, but you can reduce your risk of severe reactions by identifying and avoiding triggers. Allergy testing helps with this.

Vaccines

There is no vaccine to prevent allergies. However, allergen immunotherapy can help reduce sensitivity over time.

Screening programmes

Allergy screening tests are recommended if you have symptoms that suggest an allergy. Routine screening without symptoms is not typically advised.

Complications

If left untreated

• Chronic sinus infections or ear infections
• Worsening asthma symptoms
• Poor sleep and fatigue affecting daily life
• In severe cases, life-threatening anaphylaxis

Long-term outlook

Most allergies can be managed well with the right plan. Allergy testing is a key step to understanding your triggers and taking control. With proper treatment and avoidance, most people lead normal, active lives.

Find support

Local organisations

• Your local hospital allergy clinic or your GP · International

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