Efficacy of Lyophilized Food Extracts for Skin Prick Tests and Atopy Patch Test at Different Storage Time

Comparison of Skin Prick Tests and Atopy Patch Test Results of Lyophilized Food Extracts at Different Storage Time (0, 3 and 6 Months) After Preparation

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT03645629

Enrollment

Registered

2018-08-24

Start date

2018-01-01

Completion date

2019-07-31

Last updated

2019-08-14

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

Conditions

Food Allergy

Brief summary

Comparison the result of skin prick tests and atopy patch test of lyophilized food extracts at different storage time (0, 3 and 6 months) after preparation

Detailed description

Skin prick test were performed with lyophilized food extracts (cow milk, egg white, egg yolk, wheat, soy and shrimp) at different storage time (0, 3 and 6 months) after preparation. Atopy patch test were performed with lyophilized food extracts (cow milk, egg white, egg yolk, wheat, soy and shrimp) at different storage time (0, 3 and 6 months) after preparation

Interventions

DIAGNOSTIC_TESTskin test with food at different storage times

Perform skin tests to each foods at 0, 3, 6 months after preparation and compare the results

Study design

Allocation

NON_RANDOMIZED

Intervention model

PARALLEL

Primary purpose

DIAGNOSTIC

Masking

QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Intervention model description

Perform skin prick test and atopy patch test of lyophilized foods (cow milk, egg white, egg yolk, wheat, soy and shrimp) stored at different time; 0, 3 and 6 months after preparation. Then compare the results.

Eligibility

Sex/Gender

ALL

Age

3 Years to 18 Years

Healthy volunteers

Inclusion criteria

* mild to moderately severe food allergy patients * At least positive skin test to one kind of common food (commercial extract) * Stop antihistamine or corticosteroid (if more than 20mg/day) for at least 7 days

Exclusion criteria

* Dermographism * Severe systemic disease such as autoimmune disease, immune deficiency, malignancy * Severe dermatitis or large area involment * pregnancy

Design outcomes

Primary

Measure	Time frame	Description
skin test result of lyophilized foods at 6 months after preparation	6 month	Perform skin prick test and atopy patch test the patients with lyophilized foods at 0, 3 and 6 months after preparation and compare the results at 6 months to 0 and 3 months.

Countries

Thailand

Outcome results

None listed

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