Machiko Sameshima

About

Machiko Sameshima is the senior embryologist at Hanaoka IVF Clinic (Shinagawa) and a core member of its culture room team. The clinic publicly emphasizes that its staff “train every day, and only those who pass are allowed to handle eggs” — a gate-keeping system she both came through and helps sustain at senior level. Her daily work determines the condition in which each patient’s embryos reach transfer or storage.

Clinical Expertise

• Advanced embryo culture: extended and time-lapse-supported culture of embryos through to transfer or blastocyst stage
• Vitrification of eggs and embryos: rapid-freeze technique with storage in -196 C liquid-nitrogen tanks, backed by the clinic’s backup-power protection system
• Laboratory quality management: participation in daily quality control and workflow optimization in the embryology lab, including the RIWitness double-check protocols for egg, sperm and embryo identity

Why Choose Machiko Sameshima

In IVF, the embryology laboratory is where outcomes are won or lost, and senior embryologists are its institutional memory. Sameshima-san represents the standard the clinic set for itself: repeated daily micromanipulation drills followed by formal competency assessment before independent work with oocytes. Her senior role means the most delicate procedures — ICSI injection, freezing and warming of a patient’s only embryos — are performed within a lab culture that treats zero mix-ups and zero avoidable loss as the baseline. For patients weighing clinics on laboratory quality, the presence of a graded senior embryologist on site is a concrete differentiator.

Certifications

• Certified Clinical Embryologist (Japan)
• Certification from the Japanese Society for Clinical Embryology
• Clinic-internal oocyte-handling qualification (daily-training and assessment program)

Suitable For

• IVF patients: embryo handling from fertilization to transfer is led by the senior embryology team.
• Long-term freezing patients: vitrification quality and storage safety decide future transfer success, the core of her senior role.
• Lab-quality-focused patients: families who compare clinics on embryology standards benefit from the clinic’s competency-gated handling system.