About
Most reproductive medicine subspecialists in Bangkok trained through Siriraj, Chulalongkorn or Ramathibodi. Dr. Kritchathorn Rattanapiratanon took the northeast route: a First Class Honours medical degree at Srinakharinwirot University in Nakhon Nayok, obstetrics and gynecology residency at that university’s teaching hospital, the HRH Princess Maha Chakri Sirindhorn Medical Center, then subspecialty training in reproductive medicine at Srinagarind Hospital, Khon Kaen University — the referral centre that serves the whole Isan region and sees a high proportion of advanced and complicated infertility cases referred up from provincial hospitals.
He now practises at Siam Fertility Clinic in Phayathai, Bangkok, as one of only two registered reproductive medicine specialists there. That staffing shape matters for patients: consultations, stimulation monitoring, retrievals and transfers are carried out by subspecialists rather than being handed down to general gynecologists or junior registrars, and he works alongside the clinic’s medical director, Dr. Surachai Pornwiroon, whose case load exceeds 700 transfer cycles a year.
His published profile on the clinic’s doctor page lists education and certification rather than an employment history or cycle numbers, so no individual procedure volume is claimed here. His two certifications — obstetrics and gynecology from Srinakharinwirot University, and subspecialty in reproductive medicine from Khon Kaen University — are the verifiable record.
Clinical Expertise
- IVF cycle management: ovarian reserve assessment, protocol and dose selection, scan-guided stimulation, and the transfer decision, for patients entering their first cycle as well as those with history elsewhere
- ICSI: intracytoplasmic injection where sperm count, motility or morphology is the limiting factor, coordinated with the clinic’s HA-ICSI and MACS sperm preparation
- Female infertility diagnosis: ovulatory disorders and PCOS, tubal factors, endometriosis-related reduced fertility and unexplained infertility, worked up before a cycle is started rather than during one
- Individualized treatment sequencing: choosing between timed intercourse, IUI and IVF/ICSI on the basis of age, ovarian reserve and how long the couple has been trying
- ART laboratory coordination: egg handling, culture and transfer decisions made jointly with the clinic’s ESHRE-certified embryology team and its EmbryoScope Plus time-lapse data
Why Choose Dr. Kritchathorn Rattanapiratanon
A First Class Honours medical degree followed by residency and subspecialty training at a university referral hospital is a research-graded pathway rather than a purely clinical one, and it tends to show in how a consultation runs — the reasoning behind a protocol, the expected response range, and what would change the plan are explained rather than simply announced.
The Khon Kaen subspecialty program is also a specific kind of training ground. Srinagarind Hospital is the main tertiary referral centre for upper northeast Thailand, so the cases that reach it skew toward long-standing infertility, previous failed treatment elsewhere and patients who have already spent years in provincial clinics. Reproductive medicine trainees there get wide exposure to difficult starting points.
At Siam Fertility Clinic he is one of two subspecialists, which means continuity: the doctor who reviews your AMH result is the doctor at the retrieval and the transfer. For international patients on a fixed travel window, that continuity removes the hand-offs that otherwise cost days.
Professional Affiliations
Certification is held in two tiers: obstetrics and gynecology through Srinakharinwirot University, Nakhon Nayok, and a subspecialty in reproductive medicine through Khon Kaen University — the recognized Thai pathway to practising ART, which sits under the Medical Council of Thailand’s specialist register. The clinic as an institution is accredited by RTAC and registered to ISO 9001:2015, so his practice operates inside those audited protocols. No individual licence number or society membership is published for him on the clinic’s website, and none is asserted here.
Suitable For
IVF patients starting a first cycle — the decision set at the beginning (protocol, dose, fresh versus freeze-all, whether to screen embryos) shapes the whole attempt, and a subspecialist consultation before stimulation is the highest-value visit in the sequence.
ICSI for male factor infertility — where the diagnosis is sperm quality, fertilization is handled by injection, and the clinic’s sperm preparation options (HA-ICSI, MACS removal of apoptotic sperm) are available to add to the cycle.
Female infertility: ovulatory disorders and unexplained infertility — PCOS and irregular ovulation are managed with monitored induction and, when appropriate, IUI before escalating, with the clinic’s own criteria applied: patent tubes, a post-wash sperm count above 5 million, and age under 40.
Patients who want each step explained — his profile emphasizes systematic, individualized treatment, and the clinic pairs subspecialist consultations with coordinator support in English, Mandarin and Vietnamese, so the explanation continues between visits rather than only inside the room.