Dr. Kei Tanaka

About

Dr. Kei Tanaka opened Tanaka Ladies Clinic Shibuya in February 2024, on a career that ran through two countries’ medical systems. She took her medical degree at Fujian Medical University in China (1988), then a doctorate at the University of Tokyo Graduate School of Medicine (1999), followed by OB-GYN posts at the University of Tokyo Hospital, the Tokyo Red Cross Medical Center and the Tokyo North Medical Center.

The long stretch came at Kato Ladies Clinic (April 2013 - February 2024): eleven years at Tokyo’s best-known practice for natural-cycle and mild-stimulation IVF, and more than 20,000 low-stimulation and natural-cycle cases (source: clinic physician profile page). That volume became the template for the clinic she founded. Stimulation drugs are used only where they earn their place; intervention is timed to the patient’s cycle rather than to the clinic’s calendar. Her own description of the method is agricultural — a good egg is the seed, a healthy body the soil, and the pregnancy is what grows out of both — which is why Kampo herbal medicine and acupuncture sit inside the treatment plan rather than beside it.

She holds four certifications: JSOG obstetrician-gynecologist, Japan Society for Reproductive Medicine specialist and instructor, Japan Society of Human Genetics clinical geneticist, and Japanese Society for Oriental Medicine Kampo specialist. The genetics credential puts PGT-A/PGT-SR counseling inside her consult room; the Kampo credential underpins the clinic’s herbal-and-acupuncture program. In May 2026 she signed the clinic’s own treatment-results announcement — age-stratified gestational-sac rates, 57.3% overall for April 2024 - December 2025, method stated on the page.

Clinical Expertise

• Natural-cycle and mild-stimulation IVF: her core area — low medication load, cycles followed against the body’s own rhythm, retrieval of one or a few eggs rather than a cohort. Twenty thousand-plus cases on this exact path feed her protocol design and her read on which patients will respond
• Full-cycle IVF and ICSI management: stimulation or induction, retrieval, fertilization and transfer, with the same attention paid to how eggs and sperm are obtained as to the lab work that follows — she names stimulation method, laboratory technique and even equipment choice as separate variables to optimize
• Reproductive genetics: as a board-certified clinical geneticist, she handles PGT-A/PGT-SR indication judgment and couple karyotype counseling in-house
• East Asian medicine alongside ART: Kampo herbal prescriptions and acupuncture used for cycle preparation, endometrial environment and whole-body balance, prescribed under her own Kampo-specialist credential
• Diminished ovarian reserve and advanced-age pathways: the low-stimulation protocol set exists for patients whose ovaries respond poorly to high-dose drugs

Why Choose Dr. Kei Tanaka

Volume in exactly the protocol you are considering. Mild-stimulation IVF is technically unforgiving: fewer eggs per retrieval leaves no room for loose lab or timing work, because every weak step costs outcome directly. Twenty thousand cases concentrated on a single technical route is rare in what Japanese private fertility clinics publish about themselves, and it is the whole basis of the protocol design at the clinic she founded.

A geneticist at the head of the clinic. Few IVF directors carry a Japan Society of Human Genetics clinical-genetics certification alongside reproductive-medicine instructor status. For couples weighing PGT-A against other options, the person deciding whether the indication exists is the same person qualified to read the report.

Trained in two medical systems, and accountable for the numbers. Her medical degree came from Fujian Medical University, her doctorate from the University of Tokyo, and the Kampo credential adds a third tradition to the mix — the resulting style is detail-driven and body-wide at once. She also signed the clinic’s May 2026 age-stratified gestational-sac results with the method stated, rather than leaving the figures unsigned. One limitation to plan around: the clinic publishes English and Chinese categories in its news archive but runs no standing foreign-language consultation service, so overseas patients should arrange a professional medical interpreter before booking (the clinic asks that accompanying interpreters be women).

Professional Affiliations

Four personal certifications, each issued by its own society: certified obstetrician-gynecologist of the Japan Society of Obstetrics and Gynecology; certified reproductive medicine specialist and instructor of the Japan Society for Reproductive Medicine; certified clinical geneticist of the Japan Society of Human Genetics; certified Kampo specialist of the Japanese Society for Oriental Medicine. She additionally holds membership in the Japanese Society for Women’s Health and the Japan Society of Obstetrical and Gynaecological Genetics. Her listed posts and dates match the entries kept by the third-party directories FUNIN.INFO and DoctorsFile, which is the practical way to cross-check a Japanese clinic profile from abroad.

Suitable For

• Patients wanting low-medication IVF: if you are worried about ovarian hyperstimulation, or simply want the lightest drug load that still gives a real chance, this clinic’s default route — not an option bolted onto a high-dose program — is the one you would be counseled into
• Advanced maternal age or diminished ovarian reserve: where a high-dose protocol would not have produced many more eggs anyway, trading cycle count for egg quality and timing precision fits the physiology better
• Genetics-informed decisions: couples considering PGT-A/PGT-SR, or carrying a heritable condition, can put the indication question and the result interpretation to the same physician, who holds the clinical-genetics certification
• Integrative-care seekers: Kampo herbal prescriptions and acupuncture support are written into cycle preparation here by a certified Kampo specialist, not referred out to a separate clinic