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Your child's appointment with our allergy service

The entrance to Evelina London allergy services at St Thomas' Hospital
Remember that our allergy service is based at St Thomas' Hospital, not Evelina London

If you would like your child to be seen by one of our specialists, he or she will need to be referred by their GP or a health professional from another hospital.

Your GP might give you a reference number to use on the NHS Choose and Book system or your GP can send a referral directly to our department. See the referrals page for more information.

We want to make your visit to our clinic as easy and efficient as possible by combining the consultation, allergy testing and specialist input from other professionals, such as dietitians, all in

one visit. This may involve short periods of waiting, but removes the need for multiple visits.

About your appointment

Cancelling or changing your appointment

To change or cancel a new appointment, telephone the appointment centre on 020 7188 8884.

To cancel or change a follow up appointment, telephone the children's allergy clinic on 020 7188 8498. 

Before your appointment

If your child is taking antihistamine medicine (eg: Piriton©, Zitek© or Clarityn©) they will need to stop taking them before they come for their appointment as they might interfere with the test. Please stop taking:

  • short-acting antihistamines, such as Chlorphenamine (also known as Piriton©) two days before the appointment
  • long-acting antihistamines, such as Cetirizine and Loratidine (also known as Zirtek© and Clarityn©) five days before the appointment.

Please be aware that some cough and cold remedies (such as Benylin© and Medised©) contain antihistamine. Please speak to your pharmacist if you have any queries.

Your child does not need to stop any other medication such as asthma inhalers, nasal sprays or other medicines. Please bring details of your child’s medicines with you to the clinic. If your child uses inhalers please bring these and their spacer device with you to the appointment.

We have skin prick test extracts for many allergens such as nuts, egg, milk, fish, pollens, animals and some medicines. However, if you suspect fruit and vegetables may cause a problem and wish to be tested for these, please bring a small quantity of the particular fruit/vegetable with you to the clinic.

If you have any queries, please contact the outpatient team on 020 7188 7249.

What to expect at your appointment

Your child will see a variety of specialists, including consultants, nurses and dietitians. He or she may have a series of allergy tests including: skin prick testing, atopy patch testing, spirometry (lung function testing) and exhaled nitric oxide (ENO testing).

We may also give you advice regarding management of allergic diseases, such as how to use inhalers and nasal sprays correctly and advice on eczema management. You will receive advice on what to do if your child has an allergic reaction, including the correct use of antihistamines and adrenaline auto injectors, if necessary.

The dietitian advises families on how to avoid foods they are allergic to and ensures that your child is having a balanced diet within the limitations of their allergies. 

After your appointment

Your doctor or nurse may give you a prescription for your child, which you can take to the hospital pharmacy or to your GP. 

If your child needs to have a blood test, one of the nurses will give you directions to the blood testing centre and will apply local anaesthetic cream to numb the skin before the blood test if required.

A follow-up appointment will be sent to you by post.

If you need to speak to someone after your child’s appointment, please telephone 020 7188 3300.



Tel: 020 7188 3300

Opening hours: Monday-Friday, 9am-5pm

How to find us

Children's allergy service
Second floor, Staircase B, South Wing
St Thomas' Hospital
Westminster Bridge Road
London SE1 7EH

This department is only accessible via lift/staircase B.

Map of Second Floor, South Wing, St Thomas' Hospital 

©  Guy's and St Thomas' NHS Foundation Trust
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