When you are starting your IVF journey, you will be swimming with sorts of many new terms. In vitro fertilization is a crucial and sensitive medical procedure that involves a range of stages. One among them is trigger shots, a significant stage of the process denoting the end of ovarian stimulation medication.
Your fertility specialist will suggest to you when you need this trigger shot and how it is related to other medications and procedures.
In this article, you’ll learn a bit about what a trigger injection IVF, its importance, and how it positively influences your success rate.
What is a trigger Injection IVF?
A trigger injection (or trigger shot) is a hormonal injection used during IVF to help mature the eggs before retrieval. It contains hCG (human chorionic gonadotropin)—sold under names like Ovidrel, Pregnyl, or Novarel—which mimics the natural LH (luteinizing hormone) surge. This shot prepares the eggs for ovulation and ensures they’re ready for fertilization by initiating a process called meiosis, which reduces the number of chromosomes in the egg from 46 to 23.
Besides the trigger shot, there are multiple other injections for IVF treatment given at different stages to prepare your ovaries and support embryo implantation.
What is the Purpose of a Trigger Shot?
- The main purpose of a trigger shot is to:
- Stimulate final egg maturation
- Trigger ovulation at the right time
- Help the eggs complete meiosis, making them ready to combine with sperm
- Ensure timed egg retrieval about 36 hours later during the IVF cycle
This step is crucial for successful fertilization and embryo development in assisted reproduction.
When is the trigger shot given?
Doctors suggest giving a trigger shot before 36 hours of egg retrieval during the IVF cycle. The timing is very crucial; this process will work only when the eggs are at their peak maturity.
As mentioned, this trigger shot is a hormonal injection (hCG) that stimulates the ovaries to mature and release an egg. Some women may experience mild symptoms of egg rupture after receiving the hCG injection.
Before giving injections, doctors ensure that the egg reaches the desired growth and development through blood tests and ultrasounds. Under- or over-developed eggs minimize the chances of successful conception. So, the clinical team will be tracking your follicle development and suggesting an injection if it has grown to its optimal size. Even a few hours of delay can impact the success of treatment.Â
How is the trigger shot administered?
A trigger shot is a fertility medication that is usually given once per cycle. It can be administered in two ways, which helps the ovaries release mature eggs during ovulation.
Such two ways include:
Intramuscularly: In this way, the trigger shot is injected into a muscle, which may cause bruising (it will not break your skin but may cause discoloration). It makes you feel like a vaccine shot.
Subcutaneously: This is the most common route to be followed. The shot is injected under the skin, more often in the abdomen.
This trigger shot is not so painful, but you may feel some discomfort. Before undergoing this procedure, the fertility team will provide a complete guide and may offer you a practice session. It is important to follow their instructions to ensure that the medication is administered properly.
What Happens If You Miss the Trigger Shot?
- Inform your fertility hospital immediately if you miss or delay the trigger shot.
- Timing is critical — the shot is scheduled to ensure egg retrieval happens before ovulation.
- Once the egg is released naturally, it usually cannot be retrieved.
- In some cases, the clinic may try to adjust your egg retrieval time to save the cycle.
- If adjustment isn’t possible, you may need to wait until the next cycle to try again.
- Always follow your fertility team’s instructions closely to avoid timing errors.
Is the trigger shot painful?
No, the trigger shot is not usually painful. Most people feel only a slight pinch or mild discomfort at the injection site, which goes away quickly. Women often report that the subcutaneous injection (injected under the skin) causes redness and an inflamed and itchy feeling for two to three days. When using either way, intramuscular (given into the muscle) injection causes very minimal effects.
Does the trigger shot have side effects?
Yes, the trigger shot can have mild side effects. Common ones include bloating, breast tenderness, mild abdominal pain, and mood swings. These are usually temporary and subside within a few days.
Possible Side Effects of the Trigger Shot:
Most women don’t experience any major side effects or pain after a trigger shot.
- Some may feel mild abdominal discomfort and bloating.
- This discomfort is usually due to hormonal medications and the enlarged size of the ovaries.
- The trigger shot may slightly increase these symptoms.
- If you feel any unusual pain or changes in your health, consult your fertility team right away.
- Monitor bloating and abdominal discomfort carefully, as these can be early signs of Ovarian Hyperstimulation Syndrome (OHSS).
- If left untreated, OHSS can become serious and may lead to reduced urination or difficulty breathing.
Why is the trigger shot important?
A trigger shot during the IVF treatment cycle is essential to make the eggs mature for collection. Once the shot is injected, your ovaries are triggered to achieve the desired egg growth at a specific time. The whole process is crucially outlined by your fertility team to ensure the timing of eggs released from an ovary.
Since the timing and administration of this shot directly impact the success of your IVF cycle, many couples prefer getting treated at the best IVF centre in Chennai. our expert team not only ensures precise timing of the trigger shot but also monitors changes in your body and early pregnancy developments after the trigger shot, offering continuous support throughout the process. This close observation helps maximize your chances of a successful outcome
Conclusion
If you want to know more about trigger shots, consult with your fertility specialist. It is the most important phase of the IVF cycle and involves collecting the eggs from the ovaries. Your fertility team will be continuously monitoring your treatment cycle to inject trigger shots at the right time.
The process is simple yet crucial; you will be more careful and follow the instructions given by your doctor.
FAQs
Yes, a trigger shot plays a vital role in the IVF cycle. It ensures that the eggs in the ovaries are mature and ready for fertilization. This is the most common phase of fertility treatment to improve the chances of conception.
Most women don’t experience any pain or side effects due to a trigger shot. It may cause some abdominal discomfort and bloating, redness, or itchy feeling in the area around the shot. However, these symptoms can last for 2 to 3 days, but if they extend, you can consult your fertility team for further guidance.
This trigger shot causes ovulation to occur within 36 to 40 hours after injection. During this gap, a fertility team will schedule a plan for egg retrieval. This timing is very crucial in fertility procedures, which directly influences the chances of conception.
