Efficacy of Local Food Extracts at Different Storage Times

Efficacy of Local Lyophilized Food Extracts for Skin Prick Tests and Atopy Patch Test at Different Storage Times (0, 3 and 6 Months)

Status

UNKNOWN

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT02774629

Enrollment

Registered

2016-05-17

Start date

2017-01-01

Completion date

2019-08-31

Last updated

2019-03-14

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Food Allergy

Keywords

food allergy, skin prick test, atopy patch test

Brief summary

Local lyophylized food extracts are available useful in skin prick test and atopy patch test to confirm food allergy. However, the investigators want to know the duration that the investigators can keep the extracts for the usage in this purpose.

Detailed description

Food allergy incidence increases world wide. The diagnosis mostly depends on history. Skin prick test and atopic patch test are useful in finding the causative foods in some cases. The local food extracts have been shown to be at least as effective as commercial ones. From previous study the investigators keep the extract at 2-8 degree Celsius for 1-3 months for the usage. The investigators want to evaluate the duration that the extracts are still useful in diagnosis food allergy

Interventions

OTHERprick and patch test

The cases are pricked and patched with local food allergen extract at different storage times (0, 3 and 6 months after preparation)

Study design

Observational model

COHORT

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

3 Years to 18 Years

Healthy volunteers

Inclusion criteria

* Positive skin prick test to one of the food (milk, egg, soy, wheat, seafood)

Exclusion criteria

* Chronic diseases such as heart disease, liver, renal and severe sepsis * Severe allergic symptoms such as anaphylaxis * Extensive skin rashes * Pregnancy

Design outcomes

Primary

Measure	Time frame	Description
Mean wheal diameter of skin prick test	2 years	The skin prick tests are performed with local prepared food allergen at keeping time of 0, 3 and 6 months after the preparation.

Secondary

Measure	Time frame	Description
Result of atopy patch test	2 years	atopy patch tests are performed with local prepared food allergen at keeping time of 0, 3 and 6 months after the preparation.

Countries

Thailand

Contacts

Primary ContactNualanong Visitsunthorn, Professor

nualanongv@yahoo.com024197000

Backup ContactOrathai Jirapongsananurak, Prof

jirapongo@yahoo.com024197000

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026