The best time to perform an ultrasound scan for fertility assessment depends on what the scan is intended to check. There are different types of ultrasounds used at different times for various fertility evaluations:

1. Follicular Monitoring: This type of ultrasound is done to monitor the growth of ovarian follicles. It is typically performed during the first half of your menstrual cycle, often starting around day 10 and continuing every few days. The exact timing can vary depending on the length of your cycle.

2. Endometrial Thickness and Health: Ultrasound scans can also be used to assess the thickness and health of the endometrium (the lining of the uterus), which is important for implantation. This is often done in the second half of the menstrual cycle, around the time of ovulation or just after.

3. Antral Follicle Count (AFC): This scan is usually done at the beginning of your menstrual cycle, typically on days 2-5. The AFC helps in assessing your ovarian reserve – the number and quality of eggs present in the ovaries.

4. Post-Ovulation Scans: Some scans might be done after ovulation to check for signs that ovulation has occurred.

5. General Uterine and Ovarian Health: An ultrasound can be done at any time in the cycle if the goal is to check for structural abnormalities, such as fibroids, polyps, or ovarian cysts.

It's important to follow the guidance of your healthcare provider or fertility specialist for the best timing of an ultrasound for your specific situation. They will recommend the most appropriate time based on the purpose of the ultrasound and your individual menstrual cycle.

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