Thailand IVF Stimulation Phase: Cycle Schedule and Preparation Guide

Stimulation is the part of an IVF cycle where medication is used to encourage several follicles to grow, and it is usually the phase that decides when you need to be in Thailand. The exact calendar is set by your treating clinic for your own cycle, but the general shape is predictable enough to plan around: preparation and baseline checks first, a start date tied to your menstrual cycle, a series of injection days with monitoring every few days, then a trigger injection timed to egg retrieval.

This guide is written for someone planning a first cycle from abroad. It explains how the phase is sequenced, what to prepare before travel, and which decisions belong to you, your clinic and any coordination support you use. It does not tell you which protocol or dose is right for you — that is a clinical decision made with your doctor after reviewing your history.

How the stimulation phase is sequenced

Stimulation rarely begins on the day you first contact a clinic. It sits at the end of a short run-up that usually includes a baseline assessment and, depending on your protocol, some form of cycle synchronisation or priming beforehand.

Before stimulation: baseline assessment

A baseline assessment typically involves a review of your history, blood tests and a pelvic ultrasound, and it is used to confirm that starting stimulation is appropriate for this cycle. Your clinic will tell you which tests it wants, whether they can be done at home or need to be repeated in Thailand, and how recent they must be. Test validity windows vary between clinics and are not something to assume — ask directly and get the answer in writing.

Cycle synchronisation and priming

Some protocols include a step before stimulation itself, such as medication or timing instructions intended to align your cycle with the clinic’s schedule. Whether this applies to you, what it involves and when it starts are clinical decisions. What matters for planning is that this step can shift your start date, so it is worth confirming early whether your protocol includes one.

What the stimulation days usually look like

Once stimulation starts, the phase is built around two parallel tracks: daily medication at home or in your accommodation, and monitoring visits at the clinic.

• Start date. Stimulation usually begins on a specific day of your menstrual cycle, as instructed by your clinic. The clinic, not a general guide, confirms the date for your cycle.
• Daily injections. Medication is typically given as daily injections for a number of days. Your clinic provides the prescription, the technique teaching and the instructions on timing and storage.
• Monitoring every few days. Blood tests and ultrasound are used to track follicle growth and hormone levels, and the results inform whether your dose stays the same or is adjusted.
• A moving end date. The number of stimulation days is not fixed in advance for most people. It depends on how your follicles respond, which is why the retrieval date is confirmed as the cycle progresses rather than booked firmly at the start.

Because the end date can move, treat any retrieval date given early in planning as provisional. Build flexibility into flights and accommodation rather than assuming a fixed day count.

Trigger timing and the link to egg retrieval

When monitoring shows the follicles are ready, the clinic schedules a final “trigger” injection. The trigger is timed precisely, and egg retrieval is then planned for a set interval after it — commonly described as roughly 36 hours, though your clinic will give you the exact time for your cycle. Two practical consequences follow:

• The trigger time is not flexible. If you are managing your own injections, confirm the exact clock time, the time zone you are working in, and what to do if you are unsure.
• You need to be physically in Thailand, with travel to the clinic arranged, before the trigger. This is the point where travel planning and the clinical schedule have to meet.

For a detailed walk-through of what happens on retrieval day and immediately after, see the day-by-day egg retrieval guide for international patients.

Pre-stimulation preparation checklist

Most of the preparation work happens before you travel. The items below are the ones patients most often need to organise; your clinic will confirm which apply to you.

Records and test results

• A dated list of the tests your clinic has requested, with the date each was done and the result attached.
• Any previous cycle records, operation notes or relevant history your doctor has asked for.
• Confirmation of which results the clinic has actually received and reviewed, not just sent.
• Clarity on whether any test needs repeating in Thailand and whether that affects your arrival date.

If you want a fuller picture of what diagnostic preparation can involve, the guide to IVF diagnostic preparation in Thailand covers the categories clinics commonly ask about.

Medication plan

There are two broad approaches: bringing prescribed medication with you, or having it prescribed and obtained in Thailand. Each has practical implications — customs and transport rules for medicines, storage and refrigeration during travel, prescription documentation, and cost. Your clinic decides what it will prescribe and how it prefers to supply it; ask which approach it recommends for your protocol and what documentation it will provide. Do not change, stop or start any medication without your prescriber’s instruction.

Questions to settle with the clinic before booking

• What is my confirmed start date, and what could move it?
• Which baseline tests do you need, by when, and where can they be done?
• How often should I expect monitoring, and can any early monitoring be done locally under your plan?
• Where will I be given injection teaching, and who do I contact if I am unsure about a dose or timing?
• What is the latest date I can arrive and still follow the plan?
• How and when will you send the personalised calendar, and who updates it if monitoring changes the plan?

These are clinical and scheduling questions, and your treating team is the right source for the answers. A coordinator can help you organise the questions, request the documents and keep track of what has been confirmed.

Travel timing for the stimulation phase

The central travel decision is when to arrive relative to your first monitoring appointment. Arriving with a small buffer before the first clinic visit is a common approach, because it allows for flight disruption and for any baseline check that has to happen in person. The right buffer for you depends on your protocol and the clinic’s instructions.

Practical points to plan around:

• Flexible bookings. Choose flights and accommodation that can be changed, since the retrieval date may shift as monitoring progresses.
• Local monitoring. Some clinics allow early monitoring scans at a local clinic under their plan, with results sent ahead. Ask whether this is possible for you, what the clinic needs from the local provider, and whether it changes your arrival date.
• Length of stay. Your stay needs to cover from before the first monitoring visit through retrieval and the immediate aftercare your clinic advises. The guide to how many days you may need in Thailand for an IVF cycle helps you build that estimate.
• Work and home commitments. Because the end date moves, plan the weeks after retrieval loosely until the clinic confirms timing.

For a wider view of how arrival, monitoring and retrieval fit into a trip, the IVF travel timeline guide sets the stimulation phase alongside the rest of the journey.

A worked planning example

Consider a patient who has been asked for baseline blood tests and a scan, and whose clinic has said stimulation will start on a set day of her cycle. A workable plan might look like this:

1. Complete the requested tests at home and send the dated results ahead, asking the clinic to confirm receipt and whether anything needs repeating.
2. Ask the clinic to confirm the start date, the monitoring cadence and whether any early scan can be done locally.
3. Book changeable flights to arrive a few days before the first in-person monitoring visit, and accommodation that can be extended.
4. Confirm the medication plan — what will be prescribed, where it will be obtained, and what documentation you will carry.
5. Keep the days around the expected retrieval flexible until monitoring confirms the trigger date.
6. Before returning home, ask what records you will need and who to contact with follow-up questions.

This is a planning illustration, not a template for a clinical protocol. Your clinic’s calendar replaces it once your cycle is confirmed.

Who confirms what

The division of responsibility is worth stating plainly. Your treating clinic confirms your personalised calendar, monitoring schedule, medication instructions, trigger timing and retrieval plan, and its clinicians answer your questions about diagnosis, options, risks and your individual chances. Coordination support sits alongside that: organising records and outstanding document requests, requesting appointments or remote consultations, helping with travel-stage and language needs around confirmed appointments, and assisting with records handover and follow-up questions after you return home. Coordination does not diagnose, prescribe or guarantee appointment availability, and third-party booking costs need separate confirmation.

If you would like help preparing your questions and comparing what different clinics include in their written plans, you can request a case review. For background on how medication protocols and schedules are structured, see the guide to how IVF drug protocols and schedules work.

Frequently asked questions

Can I start stimulation before I arrive in Thailand?

Some clinics allow part of the stimulation phase to begin at home, with early monitoring done locally and results sent ahead, while others ask you to be in Thailand from the start. This depends on your protocol and the clinic's preference, so confirm it before booking travel. If local monitoring is allowed, ask exactly what the clinic needs from the local provider and by when.

How much notice will I get of my egg retrieval date?

The retrieval date is confirmed as monitoring shows your follicles are responding, so it is usually settled only a short time before the trigger injection. Treat any earlier date as provisional and keep flights and accommodation changeable until the clinic confirms the trigger timing.