Top 20 Fertility Clinics with the Most Embryologists | Comparing Hospitals in Tokyo [2026]
“Which fertility clinic do you recommend?”
“If I’m undergoing IVF, should I choose a clinic with many embryologists?”
“Where are the fertility clinics in Tokyo with the most embryologists?”
When looking for a fertility clinic, you will come across various information such as reviews, pregnancy rates, treatment success rates, costs, and accessibility.
Among these, one of the items you can check as public data when considering the culture system that supports IVF and ICSI is the 'number of embryologists on staff.'
Therefore, this time, we have compiled a ranking of fertility clinics with the most embryologists based on public data from medical institutions providing fertility treatment in Tokyo, published by the Children and Families Agency. in a ranking format.
To give you the conclusion first, the clinic with the most embryologists was Kato Ladies Clinic with 63 staff members.
Second place is Reproduction Clinic Tokyo with 18, and third place is Shinbashi Yume Clinic with 13.
However, just because there are many embryologists does not necessarily mean that the pregnancy or birth rates are high, or that the culture technology is superior.
If you are looking for a fertility clinic in Tokyo, please check both the number of embryologists on staff and the actual treatment results.
We introduce treatment results in detail in this article.
Fertility Clinics in Tokyo with Many Embryologists
This ranking is based on data for Tokyo published by the Children and Families Agency's 'Let's Learn About Infertility and Recurrent Pregnancy Loss | Medical Institution Search,' and compares the number of 'embryologists' on staff at medical institutions that perform egg retrieval.
In the Children and Families Agency's medical institution search, the number of doctors and staff is listed in full-time equivalent.
Full-time equivalent is a value that indicates how many full-time employees the total working hours of full-time and part-time employees correspond to.
Therefore, the figures listed here may not match the actual number of employees belonging to the facility.
Also, facilities with the same number are ranked equally.
There are 6 facilities tied for 17th place with 7 staff members. To include all facilities tied within the top 20, we will introduce a total of 22 facilities in this Top 20 list.
Top 20 Ranking
👑1st Place | Kato Ladies Clinic [Shinjuku Ward]
Embryologists: 63
🥈2nd Place | Reproduction Clinic Tokyo [Minato Ward]
Embryologists: 18
🥉3rd Place | Shinbashi Yume Clinic [Minato Ward]
Embryologists: 13
4th Place | Kyono Art Clinic Takanawa [Minato Ward]
Embryologists: 11
4th Place | Roppongi Ladies Clinic [Minato Ward]
Embryologists: 11
4th Place | Hara Medical Clinic [Shibuya Ward]
Embryologists: 11
4th Place | Shinjuku ART Clinic [Shinjuku Ward]
Embryologists: 11
8th Place | Nishitan ART Clinic Nihonbashi [Chuo Ward]
Embryologists: 10
8th Place | Sugiyama Obstetrics & Gynecology Marunouchi [Chiyoda Ward]
Embryologists: 10
8th Place | Matsumoto Ladies IVF Clinic [Toshima Ward]
Embryologists: 10
11th Place | Ikebukuro Ezaki Ladies Clinic [Toshima Ward]
Embryologists: 9
12th Place | Nishitan ART Clinic Shinjuku [Shinjuku Ward]
Embryologists: 8
12th Place | torch clinic [Shibuya Ward]
Embryologists: 8
12th Place | Sakura & Harune Clinic Ginza [Chuo Ward]
Embryologists: 8
12th Place | Asada Ladies Shinagawa Clinic [Minato Ward]
Embryologists: 8
12th Place | Usuda Ladies Clinic [Musashino City]
Embryologists: 8
17th Place | Yoshihiro Women's Clinic [Taito Ward]
Embryologists: 7
17th Place | torch clinic Ueno Branch [Taito Ward]
Embryologists: 7
17th Place | Umegaoka Obstetrics and Gynecology [Setagaya Ward]
Embryologists: 7
17th Place | Morozumi Ladies Clinic [Chuo Ward]
Embryologists: 7
17th Place | Women's Clinic Oizumi Gakuen [Nerima Ward]
Embryologists: 7
17th Place | Keiai Clinic [Toshima Ward]
Embryologists: 7
What is an embryologist?
An embryologist is a professional who handles eggs, sperm, and fertilized embryos during in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI).
They are also sometimes referred to by the English term "embryologist."
In the medical institution search provided by the Children and Families Agency, the number of staff is listed under the category of "Embryologist".
The main duties performed by an embryologist include the following:
Confirmation of retrieved eggs
Sperm preparation
In vitro fertilization (IVF)
Intracytoplasmic sperm injection (ICSI)
Confirmation of fertilization
Culture and observation of fertilized embryos
Freezing of embryos, eggs, and sperm
Thawing of frozen embryos
Management of culture records and frozen specimens
Embryologists support the critical stages of in vitro fertilization, from confirming retrieved eggs to fertilization, embryo culture, freezing, and thawing.
When looking for a fertility clinic, is it better to have more embryologists?
The number of embryologists can be a factor in judging a clinic's culture system and facility scale.
Clinics with a high number of egg retrievals and intracytoplasmic sperm injections handle many eggs and embryos, so it is expected that they would have a larger number of embryologists on staff to accommodate this.
However, you cannot conclude that a clinic has superior culture techniques or treatment outcomes just because it has many embryologists.
When comparing clinics, you should check not only the number of staff but also the following information:
Annual number of egg retrievals
Number of in vitro fertilization and intracytoplasmic sperm injection procedures
Number of embryo transfers
Treatment outcomes by age
It is important to check 'how many embryologists there are' in conjunction with 'how much treatment is actually being performed.'
Treatment outcomes are introduced in the following article.
The number of cases or workload per embryologist is unknown
What can be understood from the currently published data is the number of full-time equivalent embryologists stationed at each facility.
On the other hand, information such as the following is not known:
Number of egg retrievals handled per embryologist
Number of intracytoplasmic sperm injections performed per person
Years of experience
Certifications held
Night and holiday work shifts
Division of labor in laboratory tasks
For example, even in a facility with 10 embryologists, if the annual number of egg retrievals is extremely high, the number of cases handled per person may be high.
Conversely, even if the number of staff is small, if the total number of egg retrievals at the facility is low, the burden per person is not necessarily high.
Therefore, to compare the laboratory systems more accurately,
as a reference value, you can also check
"Number of egg retrievals ÷ Number of full-time equivalent embryologists"
.
However, embryologists are responsible not only for checking eggs after retrieval but also for sperm preparation, in vitro fertilization, intracytoplasmic sperm injection, embryo culture, freezing/thawing, and specimen management. Therefore, this calculation result does not indicate the actual number of cases handled or the workload.
Be careful when choosing a fertility clinic based solely on reviews
Google Maps and review sites are useful for learning about waiting times, the atmosphere inside the clinic, and staff responsiveness.
However, since reviews do not reflect differences in patient age, causes of infertility, or treatment history, you cannot judge treatment outcomes or laboratory techniques based solely on review ratings.
When choosing a hospital, along with reviews, be sure to check publicly available data such as the number of embryologists and reproductive medicine specialists, the number of egg retrievals, the number of intracytoplasmic sperm injections, and the number of embryo transfers.
Summary | Check both the number of embryologists and treatment results
The number of embryologists is one of the pieces of public data you should check when considering the scale and laboratory system of a clinic.
However, you cannot judge laboratory techniques or treatment results based on numbers alone. It is important to also check the number of egg retrievals, the number of intracytoplasmic sperm injections, treatment results by age, and the management system of the laboratory.
Consider a fertility clinic that suits you, taking into account your age, treatment history, desired treatment methods, and ease of access.
Ranking of the number of embryologists in Tokyo | All 68 facilities
The following is a list of the 68 facilities in Tokyo that perform egg retrieval that were checked this time.
The number of staff is based on full-time equivalents.
Facilities with the same number of staff are ranked equally.
1st Place
Kato Ladies Clinic | Shinjuku Ward
Embryologists: 63
2nd Place
Reproduction Clinic Tokyo | Minato Ward
Embryologists: 18
3rd Place
Shimbashi Yume Clinic | Minato Ward
Embryologists: 13
4th Place
Kyono Art Clinic Takanawa | Minato Ward
Embryologists: 11
Roppongi Ladies Clinic | Minato Ward
Embryologists: 11
Hara Medical Clinic | Shibuya Ward
Embryologists: 11
shinjuku ART clinic | Shinjuku Ward
Embryologists: 11
8th Place
Nishitan ART Clinic Nihonbashi | Chuo Ward
Embryologists: 10
Sugiyama Obstetrics and Gynecology Marunouchi | Chiyoda Ward
Embryologists: 10
Matsumoto Ladies IVF Clinic | Toshima Ward
Embryologists: 10
11th Place
Ikebukuro Ezaki Ladies Clinic | Toshima Ward
Embryologists: 9
12th Place
Nishitan ART Clinic Shinjuku | Shinjuku Ward
Embryologists: 8
torch clinic | Shibuya Ward
Embryologists: 8
Sakura Harune Clinic Ginza | Chuo Ward
Embryologists: 8
Asada Ladies Shinagawa Clinic | Minato Ward
Embryologists: 8
Usuda Ladies Clinic | Musashino City
Embryologists: 8
17th Place
Yoshihiro Women's Clinic | Taito Ward
Embryologists: 7
torch clinic Ueno Branch | Taito Ward
Embryologists: 7
Umegaoka Obstetrics and Gynecology | Setagaya Ward
Embryologists: 7
Morozumi Ladies Clinic | Chuo Ward
Embryologists: 7
Women's Clinic Oizumi Gakuen | Nerima Ward
Embryologists: 7
Keiai Clinic | Toshima Ward
Embryologists: 7
23rd Place
Sakura no Me Clinic | Shinjuku Ward
Embryologists: 6
Usui Clinic | Adachi Ward
Embryologists: 6
Kanda Women's Clinic | Chiyoda Ward
Embryologists: 6
26th Place
Jinnai Women's Clinic | Setagaya Ward
Embryologists: 5
Ginza Kounotori Ladies Clinic | Chuo Ward
Embryologists: 5
Nishitan ART Clinic Shinagawa Branch | Minato Ward
Embryologists: 5
Iris Women's Clinic Musashisakai | Musashino City
Embryologists: 5
Kiba Park Clinic | Koto Ward
Embryologists: 5
Saiwaicho IVF Clinic | Fuchu City
Embryologists: 5
Niji Clinic | Suginami Ward
Embryologists: 5
Mine Ladies Clinic | Meguro Ward
Embryologists: 5
Mimuro Women's Clinic | Machida City
Embryologists: 5
Kinema Art Clinic | Ota Ward
Embryologists: 5
36th Place
Sangenjaya Art Clinic | Setagaya Ward
Embryologists: 4
Oak Ginza Ladies Clinic | Chuo Ward
Embryologists: 4
Meguro Ladies Clinic | Meguro Ward
Embryologists: 4
The University of Tokyo Hospital | Bunkyo Ward
Embryologists: 4
Roppongi Ladies Clinic Ikebukuro Branch | Toshima Ward
Embryologists: 4
Hanamizuki Women's Clinic Kichijoji | Musashino City
Embryologists: 4
Akihabara ART Clinic | Taito Ward
Embryologists: 4
Den-en-toshi Ladies Clinic Futako-Tamagawa | Setagaya Ward
Embryologists: 4
Majima Clinic | Adachi Ward
Embryologists: 4
Sakura Cross Women's Clinic Shibuya | Shibuya Ward
Embryologists: 4
Tokyo Heart Clinic | Minato Ward
Embryologists: 4
Azabu Monte-Art Ladies Clinic | Minato Ward
Embryologists: 4
Tokuoka Ladies Clinic | Meguro Ward
Embryologists: 4
Jonan Ladies Clinic Shinagawa | Minato Ward
Embryologists: 4
50th Place
Tanaka Ladies Clinic Shibuya | Shibuya Ward
Embryologists: 3
Nishitan ART Clinic Shibuya Branch | Shibuya Ward
Embryologists: 3
Nishitan ART Clinic Tokyo Marunouchi Main Clinic | Chiyoda Ward
Embryologists: 3
Yasuko Utsumi Ladies Clinic | Shinjuku Ward
Embryologists: 3
Tokyo AMH Clinic Ginza | Minato Ward
Embryologists: 3
Tokyo Adventist Hospital Megumi Clinic | Suginami Ward
Embryologists: 3
56th Place
Kyono Art Clinic Shinagawa | Shinagawa Ward
Embryologists: 2
Showa University Koto Toyosu Hospital | Koto Ward
Embryologists: 2
Shiba Park Kamiyama Clinic | Minato Ward
Embryologists: 2
Ikuryo Clinic | Meguro Ward
Embryologists: 2
Grace Sugiyama Clinic SHIBUYA | Shibuya Ward
Embryologists: 2
Toranomon Hospital | Minato Ward
Embryologists: 2
Tokyo Medical University Hospital | Shinjuku Ward
Embryologists: 2
Akasaka Ladies Clinic | Minato Ward
Embryologists: 2
64th Place
Suzuki Ladies Clinic Shinjuku | Shinjuku Ward
Embryologists: 1
Asahi Ladies Clinic | Chiyoda Ward
Embryologists: 1
Omotesando ART Clinic | Minato Ward
Embryologists: 1
Kyorin University Hospital | Mitaka City
Embryologists: 1
68th place
Hanaoka IVF Clinic Shinagawa | Shinagawa Ward
Embryologists: 0
*A count of 0 is based on published data. It does not necessarily reflect current staffing or actual clinical operations.
Sources and References
[Data]
Children and Families Agency, 'Let's Learn About Infertility and Recurrent Pregnancy Loss Together | Medical Institution Search'
Created based on public data from Tokyo medical institutions that perform egg retrieval and fertility treatments. Staffing numbers are in full-time equivalents. Data retrieved in July 2026.
*This article organizes information based on publicly available medical institution data and does not guarantee the treatment efficacy or superiority of any specific medical institution.
*The listed staffing numbers are current as of the time the data was retrieved. They may differ from current staffing due to hiring, resignations, or transfers.
*For the latest clinical systems or staff arrangements, please check the official website of each medical institution or contact them directly.
For those who want to compare more fertility clinics in Tokyo
・Clinic comparisons by the 23 wards
・Number of egg retrievals, ICSI procedures, and frozen embryo transfers
・Performance by age group and for patients over 40
・Number of reproductive medicine specialists
・Public data such as OHSS rates
Please see the list of articles summarizing these topics.
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