The earliest stages, carefully observed.
Start with the essentials ↓
Clinical care and embryology work together to connect laboratory observations with the next steps in your treatment. Your team explains what is observed, what it means and which options to consider.
Talk with our team ↗Embryology studies early development. In IVF, embryologists work with eggs, sperm and embryos, observing development in a controlled laboratory environment.
Your laboratory updates connect what is observed with the decisions ahead. Development varies, and not every egg becomes an embryo suitable for transfer.
An early stage after fertilization, before the first cell division.
The first cleavage division produces two cells.
Further cleavage produces more cells within the outer shell.
Cleavage is a series of early cell divisions, including the two- and four-cell stages. Here, eight cells illustrate continued division.
Cells compact into a closely joined mass. This stage precedes formation of the fluid-filled cavity.
A fluid-filled cavity forms, with an outer cell layer and an inner cell mass. Development varies; not all embryos reach this stage.
Simplified educational illustration. Select each concept at your pace; not a clinical image, fixed timetable or prediction.
Stage definitions: ASRM fertility-care glossary ↗. Timing and development vary.
Confirm the plan and sample identification.
Use the agreed fertilization approach.
Assess changes in cell number and appearance.
Discuss transfer, freezing or further planning.
A conceptual guide. Your care team provides the sequence and timing that apply to you.
Checks are temporary. No information is saved or submitted.
Appearance and development provide information, but they do not guarantee pregnancy. A cycle may produce no embryo suitable for transfer.
Write down the questions that matter to you. Ask the team how to share prior records securely and whether counseling or financial follow-up would help.
Prepare for your first visit →Prepared October 1, 2026. Educational overview; your clinician provides individualized advice.
Information matters most when it becomes a clear conversation.
Your history, test results and laboratory findings help guide an individualized plan. Your care team can explain what is known, what remains uncertain and what comes next.
The earliest stages, carefully observed.
Explore the guide →One beginning. Different ways to support it.
Explore the guide →Different questions need different tests.
Explore the guide →Chromosome information, with context.
Explore the guide →Patterns can inform. People make the decisions.
Explore the guide →Care in every handoff.
Explore the guide →