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Fertility Ultrasound: Follicle Tracking and IVF Scanning

Fertility clinics run many short transvaginal scans and rely on consistent measurements to time treatment. What the equipment needs to do, from the baseline scan to egg collection.

Also called Follicle tracking ultrasound, Folliculometry, IVF ultrasound

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The scans in a treatment cycle

ScanWhenWhat is recorded
BaselineEarly in the cycle, before treatment startsAntral follicle count, ovarian cysts, uterus and endometrium
Follicle trackingEvery few days during ovulation induction or ovarian stimulation, as the protocol setsNumber and size of follicles in each ovary, endometrial thickness
Trigger decisionWhen the leading follicles reach the size the protocol setsFollicle sizes and counts, endometrium
Egg collectionIn theatre, under sedationThe needle guided into each follicle through the vaginal wall
Embryo transferUsually transabdominal, with a comfortably full bladderCatheter position in the uterine cavity
Early pregnancyAfter a positive pregnancy testIntrauterine sac, heartbeat, number of pregnancies

Measuring follicles and the endometrium

Treatment decisions hang on millimetres, so every operator in the clinic should measure the same way — and the machine should make that easy.

Follicles

Measure each follicle from inner wall to inner wall, usually as the mean of two or three perpendicular diameters, and label it left or right. A gynaecology package that tabulates follicles by size and side, and shows the trend across visits, saves time.

Antral follicle count

The number of small (2–10 mm) follicles in both ovaries early in the cycle. Read together with blood tests such as AMH, it helps estimate ovarian reserve and plan the stimulation dose.

Endometrium

Measure the thickest part in the mid-sagittal plane of the uterus, from outer edge to outer edge across both layers, and note its pattern.

3D, automated counting and Doppler

A transvaginal volume probe and a 3D licence add tools that some fertility clinics use every day and others never need. Check that they run on the probe actually being quoted.

Automated follicle measurement

Some 3D systems detect, count and measure follicles from one volume sweep — GE’s SonoAVC is a well-known example. It is fast and consistent, but the operator still checks every result.

Uterine shape

The 3D coronal view of the uterus helps assess congenital uterine anomalies and the position of fibroids and polyps relative to the cavity.

Colour and power Doppler

Ovarian and endometrial blood flow, and recognising vessels near the needle path before egg collection.

Colour and power Doppler

Egg collection: needle guides and theatre set-up

  • A needle guide made for the exact transvaginal probe model, with the matching on-screen guide line checked against the real needle path.
  • Clear rules for the guide: single-use, or reusable and sterilised as its maker specifies.
  • A sterile probe cover, with sterile saline or a medium your embryology laboratory approves on the outside of the cover rather than ordinary gel.
  • A compact system or trolley that fits beside the theatre bed with the screen in the operator’s line of sight.
  • Clip and image storage to document the procedure.

Read next Endocavity and volume probes

Probe disinfection at fertility-clinic volumes

Every transvaginal scan touches a mucous membrane, so the probe is covered and then high-level disinfected between patients — covers can tear without anyone noticing. A busy monitoring morning can mean dozens of scans.

  • Enough transvaginal probes to rotate while one is being reprocessed, or an automated high-level disinfection unit with a short cycle.
  • Only disinfectants and systems the probe maker approves for that model.
  • A log linking each probe and disinfection cycle to the patient scanned, for traceability.
  • A dirty-to-clean workflow in the scan room so reprocessed probes never meet used ones.

Read next High-level disinfection step by stepScan room layout

Related guides

Ultrasound Probe (Transducer) Types and UsesThe probe decides what you can see. A guide to every common transducer type, how to care for it and when to replace it.Obstetric and Gynaecology Ultrasound MachinesWhat an O&G clinic needs from an ultrasound machine — from early-pregnancy transvaginal scans to growth charts, Doppler and 4D.Ultrasound Probe Disinfection: Cleaning and High-Level DisinfectionWhich level of reprocessing each probe needs, the steps between patients, and why a probe cover alone is not enough for an endocavity scan.

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Frequently asked questions

Which probe is used for follicle tracking?
A transvaginal (endocavity) probe. It sits close to the ovaries, so it shows small follicles and the endometrium in far more detail than a transabdominal scan.
What is an antral follicle count?
The number of small (2–10 mm) follicles in both ovaries early in the menstrual cycle. Together with blood tests such as AMH it helps estimate ovarian reserve.
Does a fertility clinic need 3D ultrasound?
Not for basic follicle tracking, which is done in 2D. 3D adds automated follicle counting and coronal views of the uterus, which some clinics value for speed and consistency.
How often are follicle tracking scans done?
It depends on the protocol and the response — often every few days during stimulation, and more often as the follicles approach trigger size. The treating doctor sets the schedule.

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