Pathology tests directory

Our tests directory below includes information to support you to take and submit blood transfusion, chemical pathology, haematology, immunology, bacteriology, virology and other microbiology tests.

All testing is performed within the trust unless otherwise stated.  If the required test is not listed, please contact the microbiology laboratory for guidance.

Please note: when printed, this information is only valid on the day of printing.

Reference ranges given are for general guidance. Results falling outside the reference range do not necessarily indicate underlying pathology. 

Where a colour is given for the top of a sample tube, this applies only to adult size Vacutainer® tubes. Paediatric size and other manufacturers use different colour coding. 

Key Staff

  • Jayne Barmby, Pathology Service Manager, Tel : 020 8296 2976 (St Helier) or  01372 735287 (Epsom), Email: jayne.barmby@nhs.net
  • Muhsina K Mohamedally, Pathology Quality Manager, Tel:  020 8296 2798 (St Helier) or 01372 735287 (Epsom), Email: muhsina.mohamedally@nhs.net

Please contact the laboratory if you need advice regarding paediatric specimens.

Allergen specific IgE

Alternate name

RAST

Specimen

Blood

Volume level

3.5ml

Bottle top colour

Yellow

Bottle / container

Photo of Allergen specific IgE

Turn around time

7 unless reflex testing is required (See below)

Time limit

1 Month

Reported (timescales, method)

1 Month

Additional information

It is important to note that the presence of specific IgE does not make a diagnosis of ‘Allergy’ and negative tests do not necessarily exclude ‘Allergy’. Individuals may have positive specific IgE to common food and environmental proteins (allergens) but may be asymptomatic on exposure i.e. they are not clinically allergic. Conversely, specific IgE may be negative for some allergens (particularly fruits, vegetables, latex, drugs) in the presence of clinical symptoms on exposure. Thus, wherever possible, one should test for the specific suspected allergen based on the clinical features and the temporal relationship with the putative allergen exposure. Resist the temptation to test for IgE to multitudes of allergens without clear evidence of clinical significance. Symptoms occurring more than 2 hours after exposure are unlikely to represent immediate hypersensitivity. Do not request allergy tests where the clinical features are not consistent with IgE-mediated disease e.g. migraine, fatigue, irritable bowel syndrome, arthralgia. Allergy is rarely a cause of chronic urticaria. Where there is a clinical diagnosis of chronic allergic disease but the allergen is unclear then patient diaries should be used to determine the appropriate allergens to request. Reflex testing will increase the turnaround time by another seven days. Please specify which allergens required and provide as much information as possible when requesting Specific IgE tests.

Category

Immunology

Reference range

Specific <0.35 kUA/L

Lab address

Record last modified

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