Leaflet Details
| Title | Follicle Tracking Scans |
| Department | Gynaecology |
| Author(s) | Dr Deepti Prasad and Miss Lilian Ugwumadu |
| Review Date | January 2023 |
| Next Review | January 2027 |
| Download | A5 Booklet PDF |
| Accessibility Options | Click on the Recite Me button to show our accessibility resources |
Patient Information
Background
In the normal menstrual cycle, an egg develops each month within one of the ovaries. The egg develops within a fluid filled “sac” called a follicle. The follicle grows from day one of the cycle (first day of period) and by day 12-14 should have reached the size of about 17 - 25 mm in diameter. The follicle produces a hormone called Oestrogen which in turn causes the lining of the womb to thicken. The egg is then released - a process called ovulation. Ovulation is caused by a sudden surge of another hormone known as LH, produced by the Pituitary gland.
During ovulation the follicle ruptures, sometimes causing some lower abdominal discomfort and the egg escapes and passes into the Fallopian tube where it meets sperm. After ovulation the follicle becomes the Corpus Luteum which produces another hormone called Progesterone which causes the lining of the womb to be receptive to an embryo. All evidence of the follicle and corpus luteum normally disappears by cycle day 28.
Purpose of follicle tracking
To confirm that a follicle is developing at the correct time in the cycle and is releasing the egg, in other words to confirm ovulation.
Who is follicle tracking carried out on?
Follicle tracking may be carried out for the following reasons:
- To confirm ovulation - particularly in couples with “unexplained” infertility or irregular menstruation.
- Monitoring of women undergoing ovulation induction treatment.
How is follicle tracking carried out?
The best way of looking at the ovaries is by ultrasound carried out using a vaginal probe. This method of scanning provides the most accurate image of the ovaries and uterus. A probe is inserted into the vagina (similar to having a smear taken from the cervix but usually less uncomfortable). The procedure is carried out with an empty bladder, takes no more than 10 minutes and allows us to see the womb, the lining of the womb and ovaries.
How many scans are needed?
- The first scan is carried out between days 1-5 of the cycle.
- At the first scan you will be given an appointment for another scan - usually close to the anticipated time of ovulation i.e., around day 10-14.
- There may be a need for a third or fourth scan depending on the findings of the second scan.
- Once a mature follicle has been seen, a final scan and blood test will be arranged for approximately 7 days later to determine whether the follicle has released the egg.
Results of follicle tracking
These will be told to you at the time you attend.
Is it safe?
Ultrasound has been around for the last 30 years and there are no known side effects. It does not involve the use of X-rays and it is a simple, painless procedure. This scan does not have any effect on fertility.
To book your ultrasound scans:
Please contact the Fertility unit on the first day of your period to book your scan (if your period starts on a weekend, then telephone on the Monday). Please note scanning is not available at the weekend.
Contact us
Clinical Office Admin Co-ordinator
Email:
Tel: 01932 723973
