What this card shows
The Cleavage rate (day 2 - any cleavage) card shows what share of normally fertilized oocytes had started dividing by Day 2, month by month.
Cleavage is the first cell division. A normally fertilized oocyte (2PN, two pronuclei at the Day 1 check) should be at two cells or more by Day 2. An embryo still at one cell has not started to develop.
There are four lines:
Cleavage rate: your monthly rate.
Average for selected period: your rate across the whole date range, drawn as a dashed line.
Competency: the Vienna Consensus competency level, 95% or above.
Benchmark: the Vienna Consensus benchmark, 99% or above.
This is the least demanding of the development cards. Almost every normally fertilized embryo should clear it, which is why the thresholds sit so high.
Average for selected period adds up every embryo that had started dividing by Day 2 in the date range and divides by every normally fertilized oocyte graded on Day 2 in it, so a busy month counts for more than a quiet one. Compare it with the Competency and Benchmark lines to see where your lab sits over the whole period rather than month by month. It follows every filter at the top of the dashboard.
Reading the card
The denominator is normally fertilized oocytes that were actually graded on Day 2. Embryos with no Day 2 grading on file are left out, as are Day 2 entries recorded as degenerated or as non-assessments.
This is a deliberate departure from the strict Vienna formula, which uses all normally fertilized oocytes as the denominator. Most labs now grade at Day 5 rather than Day 2, so the strict denominator would be dominated by embryos nobody looked at rather than by embryos that failed to divide. Scoring only what was assessed keeps the number about biology.
The practical consequence: if your lab grades only a subset of embryos at Day 2, this card describes that subset. It is not a whole-cohort figure.
The Competency and Benchmark lines are flat reference lines from the Vienna Consensus, not measurements from your lab.
The current month is still in progress. Embryos fertilized in the last two days have not been graded on Day 2 yet, so the latest month, and the average with it, rests on fewer embryos until they are. Because only graded embryos count, this makes the latest month less steady rather than lower. For a settled figure, set Date to end at the last full month.
Hover any month to see its exact rate and the average for the period.
Read this with Embryo development rate (day 2 - 4 or more cells) on the same tab. This card asks whether the embryo divided at all; that one asks whether it divided on schedule.
The card lives on the Laboratory performance (Vienna consensus KPIs) dashboard, on the Embryo Development tab, and responds to the filters at the top:
Date: change the time window. It scopes by the date of fertilization, and defaults to the past 6 months plus the current month.
Clinic: focus on one or more locations, if your organization has several.
Treatment type, Age at cycle start and BMI: narrow to a subset of cycles.
Where this data comes from
Both halves of this card come from the Culture tab of the patient's Cycle page: the Day 1 observation carries the pronuclei grading that puts an embryo into the cohort, and the Day 2 observation carries the cell count.
Because the denominator here is "embryos graded on Day 2", a missing Day 2 entry removes the embryo from the card rather than counting against you. What matters for accuracy is that Day 2 entries you do record carry a cell count, and that embryos which failed to cleave are recorded rather than skipped.
Opening this card
In wawa, open Insights from the sidebar, then go to Standard Reports → Laboratory Performance → Laboratory performance (Vienna consensus KPIs). Select the Embryo Development tab. The Cleavage rate (day 2 - any cleavage) card is on it.