Verified
Oak Clinic, Japan
     
4.7
Consultations 226
Reproductive Medicine
Hours: 09: 00 - 19: 00
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Clinic Details

Oak Clinic was established in Japan in 2000 and operates four clinics: Sumiyoshi, Namba, and Umeda in Osaka, and Ginza in Tokyo.

Oak Clinic has more than 20 physicians and provides IVF and related assisted reproductive services. Its areas of expertise include in vitro embryo culture (NVF), infertility at advanced reproductive age, ovarian conditions, embryo and egg freezing, reproductive genetics, PGD testing, male infertility treatment, testicular sperm retrieval, and tubal reconstructive surgery.

Oak Clinic performs nearly 3,000 IVF cycles each year for patients from Japan, China, Taiwan, Europe, and the United States.

Oak Clinic has established reproductive centers for advanced fertility treatment and introduced advanced technology.

In April 2007, the number of IVF procedure rooms at Sumiyoshi Obstetrics and Gynecology Hospital increased from one to two, allowing up to 20 egg retrieval procedures per day.

In 2016, a clinic with a reproductive center opened in Ginza, Tokyo, providing an additional accessible treatment location.


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Listing Highlights

  • Accredited hospital

  • Standardized services

  • Free estimate

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Location and Hours
2 Chome-7-9 Tamadenishi, Nishinari Ward, Osaka 557-0045, Japan
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  • Monday

    09: 00 - 19: 00

  • Tuesday

    09: 00 - 19: 00

  • Wednesday

    09: 00 - 19: 00

  • Thursday

    09: 00 - 19: 00

  • Friday

    09: 00 - 19: 00

  • Saturday

    09: 00 - 19: 00

  • Sunday

    09: 00 - 19: 00

    • Open Now
    Facilities and More
    • Credit cards accepted
    • Free W-Fi
    Doctors at This Clinic
    Verified
    Dr. 田口 早桐, Japan
         

    Reproductive Medicine |

    Years of experience | Consultations 111

    Female infertilityMale infertility
    4.6

    Free Consultation
    Verified
    Dr. 船曳 美也子, Japan
         

    Reproductive Medicine |

    Years of experience | Consultations 87

    Female infertilityMale infertility
    4.6

    Free Consultation
    Verified
    Dr. 林 輝美, Japan
         

    Reproductive Medicine |

    Years of experience | Consultations 76

    Female infertilityMale infertility
    4.5

    Free Consultation
    Verified
    Dr. 多田 佳宏, Japan
        

    Reproductive Medicine |

    Years of experience | Consultations 65

    Female infertilityMale infertility
    4.4

    Free Consultation
    Verified
    Dr. 松原 高史, Japan
        

    Reproductive Medicine |

    Years of experience | Consultations 53

    Female infertilityMale infertility
    4.4

    Free Consultation
    Dr. 渡邊 倫子, Japan
        

    Reproductive Medicine |

    Years of experience | Consultations 65

    Female infertilityMale infertility
    4.4

    Free Consultation
    Dr. Kalongos Giannina, Japan
        

    Reproductive Medicine |

    Years of experience | Consultations 54

    Female infertilityMale infertility
    4.3

    Free Consultation
    Dr. 岩本 晃明, Japan
        

    Reproductive Medicine |

    Years of experience | Consultations 42

    Female infertilityMale infertility
    4.2

    Free Consultation
    Dr. 藤島 理沙, Japan
        

    Reproductive Medicine |

    Years of experience | Consultations 42

    Female infertilityMale infertility
    4.2

    Free Consultation
    Dr. 伊元 さやか, Japan
        

    Obstetrics and Gynecology |

    Years of experience | Consultations 33

    Female infertilityMale infertility
    4.1

    Free Consultation
    Dr. 柳 由紀, Japan
        

    Obstetrics and Gynecology |

    Years of experience | Consultations 22

    Female infertilityMale infertility
    4.0

    Free Consultation
    Dr. 沖村 浩之, Japan
        

    Obstetrics and Gynecology |

    Years of experience | Consultations 21

    Female infertilityMale infertility
    4.0

    Free Consultation
    Dr. 山本 貴子, Japan
        

    Obstetrics and Gynecology |

    Years of experience | Consultations 15

    Female infertilityMale infertility
    4.0

    Free Consultation
    Dr. 高岡 宰, Japan
        

    Obstetrics and Gynecology |

    Years of experience | Consultations 11

    Female infertilityMale infertility
    4.0

    Free Consultation
    Dr. 山崎 一恭, Japan
        

    Reproductive Medicine | Obstetrics and Gynecology |

    Years of experience | Consultations 21

    Female infertilityMale infertility
    4.0

    Free Consultation
    Featured Reviews
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    Review Oak Clinic, Japan
    On-Site Overall Rating

    25 ratings

    • 5 stars
    • 4 stars
    • 3 stars
    • 2 stars
    • 1 stars
    Jun 8, 2026
    我接受了一年的不孕症治疗，从定时性交到人工授精，再到试管婴儿，最终成功怀孕并顺利分娩。 我看过很多医生，感觉他们之间信息沟通很顺畅。 关于等待时间，像治疗方案这类需要时间的咨询都是在线进行的，所以我通常都能很顺利地被叫到诊室。虽然有时等待时间较长，但如果只是需要检查卵泡发育情况，工作日下午通常不到10分钟就能完成。（这是2024年的情况。） 在治疗过程中，有时因为没有达到预期效果而感到沮丧，但每次医生都会提出下一步的建议，让我能够保持积极的心态继续治疗。 我选择这家诊所是因为它离家近，但最终，我很高兴自己做了这个决定。 谢谢。
    Apr 14, 2026
    The administration and billing were somewhat disorganized and inaccurate, so we had to verify and advocate for everything ourselves. The doctors did not seem very professional, although the medical staff were gentle. Egg retrievals for both my partner and me went fairly smoothly, but two transfers here failed and cost us two years. We eventually went to the United States, and the difference in quality was substantial. I advise older patients not to waste time in Japan.
    Apr 21, 2026
    We came to this hospital through a team in Taiwan. Although we had little contact with the interpreter beforehand and only came for the transfer, once we arrived, the interpreter was very friendly and explained every step carefully, which was truly reassuring. On transfer day, the embryo had developed from 3BB when frozen to 5BB, and pregnancy testing back in Taiwan confirmed successful implantation. We are truly grateful to the hospital.
    Apr 30, 2026
    The hospital environment is very good, and they were gentle during the transvaginal ultrasound. The overall experience was better than in Taiwan 😂 The only drawback was that I seemed to wake slightly during egg retrieval, but I vaguely remember the interpreter still being beside me, which was very reassuring 🥰 The egg retrieval and embryo culture went well this time. I hope everything continues smoothly.
    Jan 26, 2026
    Today, I successfully graduated from the clinic after my third embryo transfer. My previous embryos were graded 1bb or 2bb, so I was worried that they might not implant, but on the third attempt, a 2bb embryo implanted successfully. I am grateful that the doctor told me embryo grades are not everything and encouraged me to trust the embryos I had and proceed with a third transfer. Some clinics discard lower-grade embryos, but Oak Clinic will transfer them even when the grade is low.
    Jan 13, 2026
    I waited more than an hour. I would rather go somewhere else.
    Jan 18, 2026
    I contacted this hospital to schedule an abortion. Because the pregnancy was approaching the time limit and no other facility would accept me, I called and was told they could perform it. However, the hospital was far from my home, and because I have a 1-year-old son, traveling there repeatedly or bringing him seemed difficult. I became flustered on the phone and asked some odd questions, but the receptionist responded with an exasperated “Huh...” and made me very uncomfortable. Patients choose abortion for many different reasons, but the phone response was so lacking in courtesy that I no longer wanted to use this hospital. Fortunately, I later found another hospital closer to home that could provide the procedure. Their service was excellent, and I was glad I had not come here. I think the staff should be more pleasant.
    Dec 27, 2025
    Poor clinic. I wanted to ask many questions, but the doctor did not want me to ask because it would take too much time. The positive points are that there are few patients, appointments are quick, and the rooms are clean.
    Dec 1, 2025
    Nov 3, 2025
    Chinese-language service is available, and many Chinese patients visit. Overseas patients arranging care independently should note that an additional 50% communication and coordination fee applies, while a referral through an agency can reduce this portion to a minimum (vx:Aijitsu).
    Oct 22, 2025
    Conveniently located just one minute from the train station. The staff were very helpful and welcoming. I sometimes have trouble understanding medical terminology, so filling out forms takes time. A staff member came over, asked whether I needed help, and guided me through the forms. The doctor was also a woman, which helped me feel at ease. Most doctors are men, and even at gynecology clinics I often find it difficult or embarrassing to ask questions. The doctor was polite and respectful. They made sure I was comfortable during the procedure and protected my privacy. They also checked whether I qualified for the municipal discount rate, which was helpful because paying for the procedure myself would have cost more.
    Aug 5, 2025
    I visited to confirm the gestational sac, but it could not yet be seen. The doctor had said during phone booking that it was too early, but my schedule required an earlier visit. During the examination, although ectopic pregnancy had not been confirmed, the doctor repeatedly discussed it and said I would need a major hospital if confirmed. This made me more anxious when I was already worried about not seeing the sac. I believe doctors should avoid causing unnecessary anxiety when ectopic pregnancy has not been confirmed. I wish they would consider patients' feelings more and provide more supportive examinations.
    Mar 29, 2025
    You should think about what the teacher said. Not suitable for obstetrics and gynecology!
    May 28, 2025
    A Chinese person was eating McDonald's in front of the reception desk in the lobby.
    Jan 28, 2025
    I had surgery here. The female doctor and midwife took their time when I cried. She listened carefully to my story, was very kind, heard my concerns, and helped me work through them. I was very grateful. During surgery, the anesthesia did not work very well, and I felt some pain while still conscious. When I told them I was in pain, they explained my condition and the anesthesia in detail, so I was able to complete the procedure with peace of mind despite the pain. However, when I returned the next day to check my progress, I saw a male doctor who was extremely intimidating and treated me poorly. He did not explain anything. He said, “You asked Dr. ○○, right? Whatever happened is not my responsibility. Ask Dr. ○○ if you have questions.” Honestly, I thought I should just give up.
    Dec 1, 2024
    My symptoms were the same as before, and although I knew the medication's name, the doctor gave me a different diagnosis and prescribed a completely different, more expensive drug. I went there because it was nearby, but the doctor would not listen even when I explained. I believed I was right. I went to another hospital and received the usual medication. That was the correct answer. I would give 0 stars.
    Jan 16, 2025
    This was a long time ago, but reception displayed various instructions, such as requiring patients to greet the doctor and not speak loudly. I felt this was disrespectful to patients and apparently came from management. With that said, I was surprised when the female doctor remained silent and did not begin the examination at all, so I went home.
    Oct 14, 2024
    Sep 14, 2024
    The examination table was very hard, the backrest was too steep, and I could not sit securely. During the examination, the doctor and nurse asked, “Is this something?” and said, “But this is not right...” I heard many worrying comments, and instruments were repeatedly manipulating my uterus, which was frightening. I stopped going.
    Jan 13, 2024
    I attended this hospital for infertility treatment until recently. First, thank you to everyone who supported me for two years. I underwent four egg retrievals and four transfers without becoming pregnant and have decided to transfer to another hospital. Here are the reasons. ① My transfer plan was repeatedly entered incorrectly. ② Billing errors occurred frequently. ③ They did not suggest testing. ④ Even with an appointment, visits took 2-3 hours. Regarding ①: AHA, embryo glue, anesthesia, and so on. Even after requests, items could be omitted or forgotten, so I had to check repeatedly. ② Errors occurred often and commonly involved tens of thousands of yen. I was billed again despite having prepaid, and was charged ¥30,000 for hospitalization despite never being admitted. I would not have received a refund if I had not noticed. This carelessness caused distrust. There were other charges I thought were wrong, but they no longer matter. ③ After 4 unsuccessful transfers, various tests seemed worthwhile, but when I requested testing, they advised collecting more eggs instead. At that point, I lost interest in listening. Perhaps repeated attempts would eventually work—even after 100 transfers—but patients seek the shortest path because of cost and physical strain. Only after two years did I realize that the doctor and I were headed in different directions. ④ Insurance coverage may have increased demand, but if appointments cannot run on time, please do not overbook. I often saw patients angry with receptionists or nurses. Even arriving at the scheduled time, a visit took about 3 hours. The examination took only 5 minutes; the remaining 2 hours 55 minutes were waiting. I could not make plans afterward. I appreciate the work during a busy schedule, but are there not too many bookings? I wrote extensively about outcomes, but treatment results are either 0 or 100. Without results, it feels as though nothing was done. I understand this is not necessarily the hospital's fault and that patients differ; I hold no resentment. But patients are not figurines moving along a conveyor belt. They have different feelings, expectations, and circumstances. Repeated omissions from plans, billing errors, and rushed visits are common but disrespectful. Although I had no result, I remain grateful. Yet I believe these errors persisted because I was not treated as a person, only processed. That said, this hospital can help patients whose circumstances are favorable. This is only one opinion. I hope my two-year experience helps others choose or change hospitals. I hope many patients are rewarded. P.S. I hope these blastocyst results are useful, though individual differences apply. First, mild stimulation → 0 blastocysts Second, high stimulation → 1 blastocyst (4BC) Third, high stimulation → 2 blastocysts (both ungradable early blastocysts) Fourth, high stimulation → 3 blastocysts (one 3BB and 2 early blastocysts) With high stimulation, 11-12 eggs were retrieved each time and about 1 blastocyst obtained. (2024/1/13) I later transferred to another hospital and became pregnant after one transfer. From the first examination to confirmation of pregnancy took about six months, including one testing cycle. Becoming pregnant actually took 3 months. I have now passed the stable period and am 18w. This is my update.
    Feb 16, 2024
    This is a beautiful, clean clinic. I saw a gynecologist. I was worried because it was the first time I had experienced these symptoms, but the doctor and nurse were very kind and courteous while examining me.
    Mar 17, 2024
    They did not carefully review the hospital reports I brought before egg retrieval. During retrieval, they punctured a cyst, making all the eggs on one side unusable, and then blamed the patient. Truly terrible.
    Mar 29, 2024
    May 12, 2024
    My gynecologist referred me for an HSG. The catheter used to insert the balloon could not be passed easily, and the device pulled on my cervix, causing severe pain. The pain itself may not actually have been severe, but I may have been traumatized by the fear that the cold instrument was pulling out my internal organs and by being manipulated for more than 30 minutes. I was told that the curve of my cervix was tight and difficult to enter. Also, before the examination, they asked whether I needed to use the restroom. After hearing that, I went to the restroom and then had the examination, but I later learned that the catheter is harder to insert when the bladder is not full. Ultimately, I could not complete the examination that day. Because the test could not be performed, I was not charged. When I later repeated the test at another hospital, they asked me to arrive with a full bladder. Once it was properly full, I underwent the test. It seemed somewhat difficult, but the catheter was inserted normally, and the test proceeded without pain. The doctor at this hospital did his best, but I do not know why he suggested that I use the restroom. During the procedure, I was frightened and kept trembling and sweating, but the nurse held my hand, called out to me, and encouraged me.
    May 14, 2024
    The doctor was overbearing, and I waited 30 minutes to check out. I cannot miss this much work.

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