How long does the build‑up phase usually last?

The build‑up phase typically spans several months, with dose increases every one to two weeks under medical supervision until a maintenance dose is reached.

How often are clinic visits required during OIT?

Patients usually visit the clinic for each dose increase and then weekly or biweekly during early build‑up, spacing out to monthly visits once the maintenance phase is reached.

Can my child continue taking antihistamines while on OIT?

Short‑acting antihistamines may be used for mild symptoms, but chronic high‑dose use can mask early signs of a reaction; families should discuss any allergy medications with the OIT team.

What should I do if a reaction occurs at home during OIT dosing?

Follow the emergency action plan: administer epinephrine immediately if signs of systemic reaction appear, call emergency services, and seek medical evaluation even if symptoms improve.

Peanut OIT Preparation Checklist: A Step‑by‑Step Scenario Walkthrough

Scheduling the Initial Consultation and Gathering Records

The first step in preparing for peanut oral immunotherapy (OIT) is to secure an appointment with an allergist who offers the therapy. Families should call the clinic, confirm that the provider conducts supervised OIT for peanut allergy, and ask about any pre‑visit requirements such as recent allergy test results or a medication list. Writing down the date, time, and contact information helps avoid missed calls or scheduling conflicts.

Before the visit, gather all relevant medical records. This includes previous allergy test reports (skin prick or specific IgE), notes from any past reactions, immunization history, and a list of current medications, especially antihistamines or asthma inhalers. Having these documents ready allows the allergist to verify eligibility and to discuss any conditions that might affect the OIT protocol, such as uncontrolled asthma or eosinophilic esophagitis.

Create a simple folder—either physical or digital—to store these items. Label it with the child’s name and the intended OIT start date. If the clinic provides a pre‑visit questionnaire, fill it out ahead of time and attach it to the folder. This organization step reduces the chance of forgetting a critical piece of information on the day of the appointment.

Medical History Review and Allergy Testing Confirmation

During the consultation, the allergist will review the gathered history to confirm that peanut allergy is the primary concern and that the reaction pattern fits OIT criteria. They will ask about the age of first exposure, typical symptoms, severity of past reactions, and any co‑existing allergic conditions such as asthma or eczema. This conversation establishes a baseline for dosing and helps identify any contraindications.

If recent testing is not available, the clinician may order a skin prick test or a specific IgE blood test to quantify sensitization. Skin prick results are usually read within 15‑20 minutes, while blood tests take a few days. The numbers help the allergist calculate an initial dose that is low enough to minimize risk but high enough to begin desensitization.

Ask the allergist to explain what a positive result means for OIT eligibility. Some clinics require a minimum wheal size or IgE level before starting, while others may proceed with a very low baseline if the patient has a clear history of reactions. Understanding these thresholds helps families know whether additional testing or a repeat visit is needed.

Close‑up of a healthcare professional performing a skin prick test on a child's forearm

Baseline Laboratory Checks and Medication Review

Many OIT programs request a set of baseline labs before the first dose. Commonly ordered tests include a complete blood count, comprehensive metabolic panel, and, if asthma is present, spirometry or peak flow measurements. These values give the care team a safety reference point for monitoring liver, kidney, and hematologic parameters throughout the build‑up phase.

The allergist will also review the child’s medication list to identify any drugs that could interfere with OIT. For example, chronic use of high‑dose antihistamines may blunt early symptoms, while beta‑blockers can worsen anaphylactic reactions and are usually contraindicated. If any medication poses a risk, the clinician may suggest adjusting the dose, switching to an alternative, or temporarily holding it during the build‑up.

Document any changes to medications in the same folder used for visit paperwork. Note the date of the adjustment, the prescribing clinician’s name, and the reason for the change. Keeping this log ensures that everyone involved—parents, school nurses, and the OIT team—knows which medicines are safe to use during therapy.

Creating an Emergency Action Plan and Training on Epinephrine

A core part of OIT preparation is establishing a clear emergency action plan (EAP). The plan should list the signs of an allergic reaction, the exact dose of epinephrine to administer based on the child’s weight, and the steps to call emergency services. Having this plan written down and shared with caregivers, teachers, and family members reduces hesitation during an actual event.

Most clinics provide a dosing chart that correlates weight ranges with epinephrine auto‑injector strengths (e.g., 0.15 mg for children under 30 kg, 0.30 mg for those 30 kg or more). Families should practice with a trainer device to become comfortable with the injection technique—removing the safety cap, placing the tip against the outer thigh, and holding for the recommended count.

Store the auto‑injector in its original container, away from extreme heat or cold, and check the expiration date monthly. Replace it promptly if the solution appears discolored or if the device has been used. Training sessions with the allergist or a nurse educator reinforce confidence and ensure that everyone knows where the injector is kept at home, school, and during outings.

Weight (kg)	Epinephrine dose (mg)	Auto‑injector strength
<30	0.15	0.15 mg
≥30	0.30	0.30 mg

A blue trainer epinephrine auto‑injector being held against a thigh for demonstration

Before the first OIT visit, the allergist’s office will provide educational materials about the build‑up schedule, expected symptoms, and home dosing procedures. Families should read these resources, write down any questions, and schedule a time to review them with the clinician. Understanding the protocol helps reduce anxiety and improves adherence.

The informed consent process covers potential risks such as gastrointestinal upset, eosinophilic esophagitis, or systemic reactions, as well as the commitment required for daily dosing and frequent clinic visits. Parents must sign the consent form only after they feel comfortable that the benefits outweigh the risks for their child’s situation. Keeping a copy of the signed document in the OIT folder is advisable.

On the day of the appointment, bring the OIT folder, a list of current medications, and the epinephrine auto‑injector. Arrive a few minutes early to check in, update vitals if the clinic requests, and confirm that the child is feeling well—no fever, no recent illness, and asthma under control. These final checks help the care team decide whether it is safe to proceed with the initial dose.

Worked Example: Alex’s Journey Through the Checklist

Alex is an 8‑year‑old boy who experienced hives and vomiting after eating a peanut butter sandwich at age four. His parents have kept a reaction log and have recent skin prick test results showing a 8 mm wheal. They call the allergy clinic, confirm that the provider offers supervised peanut OIT, and schedule a visit for two weeks later.

Before the appointment, Alex’s mother gathers the skin prick report, a summary of his past reactions, his immunization record, and a list of his daily medications (low‑dose inhaled corticosteroid for asthma and a cetirizine tablet for seasonal allergies). She places these items in a labeled folder and fills out the clinic’s pre‑visit questionnaire, noting that Alex’s asthma is well controlled with no nighttime symptoms.

At the visit, the allergist reviews the history, confirms the 8 mm wheal meets the clinic’s threshold, and orders a baseline CBC and metabolic panel, which return within normal limits. The clinician discusses the emergency action plan, shows Alex’s parents how to use the trainer epinephrine device, and reviews the consent form. After signing, they schedule the first OIT dose for the following morning, providing Alex with a pre‑measured peanut protein powder and instructions to observe him for two hours after administration.