IVF Laboratory Performance Benchmarks
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EMBRYOLOGY QUALITY REFERENCE
The Vienna Consensus, 2017
The Vienna Consensus, 2017
Laboratory Performance Indicators
IVF Laboratory Performance Benchmarks
The Vienna Consensus values for monitoring fresh IVF and ICSI cycles. Competence is the minimum level any laboratory should achieve; benchmark is the aspirational best-practice goal. Hover or tap a bar for what it means.
Competence
Minimum acceptable performance — falling below it is a signal to investigate.
Benchmark
Aspirational target a well-performing laboratory works toward.
01
Gametes & sperm preparation
IndicatorCompetenceBenchmark
Oocyte recovery rate Reference indicator
COCs retrieved ÷ follicles measured (stimulated cycles)
A reference indicator, not a laboratory KPI — its values are not influenced by lab practice but reflect ovarian stimulation and retrieval. Values outside the range should prompt a review of stimulation, triggering, or aspiration.
Expected range80–95%
Proportion of MII oocytes at ICSI Reference indicator
MII oocytes ÷ COCs retrieved (assessed at ICSI, 40 ± 1 h post-trigger)
A reference indicator — a proxy for the effectiveness of ovarian stimulation, not laboratory performance, since only mature (MII) oocytes can be injected.
Expected range75–90%
Sperm motility, post-preparation Performance indicator
Progressively motile spermatozoa ÷ all spermatozoa counted in final preparation (fresh normozoospermic ejaculates only)
Proportion of progressively motile sperm in the insemination preparation, for fresh normozoospermic ejaculates. A low value points to a sample or preparation problem upstream of fertilisation.
90
95
02
Fertilization · Day 1 (17 ± 1 h)
IVF normal fertilization
2PN ÷ COCs inseminated
The core read on conventional insemination. Persistently low values prompt review of sperm parameters and insemination timing.
60
75
IVF failed fertilization rate ▼ lower is better
IVF cycles with no evidence of fertilization ÷ stimulated IVF cycles (cancelled cycles excluded)
A KPI: the share of IVF cycles where nothing fertilizes. Should stay under 5%; a higher rate triggers review of sperm quality, oocyte handling, and insemination timing.
Target<5%
ICSI normal fertilization
2PN ÷ MII oocytes injected
The primary measure of injection performance. Sits above IVF because only mature, injected oocytes are in the denominator.
65
80
ICSI oocyte degeneration ▼ lower is better
Oocytes damaged ÷ oocytes injected
Lower is better. A rising rate flags injection technique, pipette quality, or unusually fragile oocytes.
≤10
≤5
03
Cleavage-stage development
Cleavage rate · Day 2
Cleaved embryos on day 2 ÷ 2PN zygotes (44 ± 1 h)
Near-universal in a healthy cohort, so it works as an early alarm — a drop usually means a culture or handling issue, not embryo quality.
95
99
Day 2 development · 4-cell
4-cell embryos on day 2 ÷ normally fertilized oocytes
Checks that development is on schedule, not merely that the embryo divided. Off-pace cohorts warrant a culture-system look.
50
80
Day 3 development · 8-cell
8-cell embryos on day 3 ÷ normally fertilized (68 ± 1 h)
On-time cleavage here tracks with blastocyst potential and is a key check on media and incubator conditions.
45
70
04
Blastocyst, biopsy & cryopreservation
Blastocyst development · Day 5
Blastocysts on day 5 ÷ normally fertilized (116 ± 2 h)
One of the most sensitive indicators of culture conditions, media lot, and incubator stability across the five-day window.
40
60
Successful biopsy rate
Biopsies with DNA detected ÷ biopsies performed
Measures biopsy and tubing technique — whether a sample amplifies — independently of what the genetic result turns out to be.
90
95
Blastocyst cryosurvival
Intact ÷ warmed (vitrification)
The headline vitrification metric. A dip points to protocol, media-lot, or operator variation in freezing or warming.
90
99
05
Transfer outcome
Implantation · cleavage stage
Gestational sacs on ultrasound ÷ embryos transferred
A shared clinical-and-lab outcome: uterine and transfer factors affect it too, so read it alongside — not instead of — the lab KPIs.
25
35
Implantation · blastocyst stage
Gestational sacs on ultrasound ÷ blastocysts transferred
Higher than cleavage stage thanks to better selection, but still shaped by patient and transfer factors beyond the laboratory.
35
60
