{"id":38285,"date":"2026-01-13T22:44:05","date_gmt":"2026-01-13T15:44:05","guid":{"rendered":"https:\/\/genesisfertility.co.th\/?p=38285"},"modified":"2026-06-13T22:47:39","modified_gmt":"2026-06-13T15:47:39","slug":"fet-frozen-embryo-transfer-what-is","status":"publish","type":"post","link":"https:\/\/genesisfertility.co.th\/en\/fet-frozen-embryo-transfer-what-is\/","title":{"rendered":"What Is FET (Frozen Embryo Transfer)? How Is It Different from Fresh Transfer?"},"content":{"rendered":"\n
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During ICSI treatment, one of the key decisions your doctor will discuss with you is whether to transfer embryos “fresh” \u2014 in the same cycle as egg retrieval \u2014 or to freeze them and transfer in a later cycle (FET).<\/p>\n\n\n\n

This guide explains both approaches, their differences, and why FET has become the preferred option in most cases.<\/p>\n\n\n\n

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What Is FET?<\/h2>\n\n\n\n

FET (Frozen Embryo Transfer) involves freezing embryos after they’ve been cultured in the lab, then thawing and transferring them in a subsequent cycle \u2014 after the body has had time to recover from ovarian stimulation.<\/p>\n\n\n\n

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What Is a Fresh Transfer?<\/h2>\n\n\n\n

A fresh transfer involves placing embryos back into the uterus in the same cycle as egg retrieval \u2014 typically on day 3 or 5 after egg collection, without any freezing step.<\/p>\n\n\n\n

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FET vs Fresh Transfer: Direct Comparison<\/h2>\n\n\n\n
<\/th>Fresh Transfer<\/th>FET<\/th><\/tr><\/thead>
Timing<\/td>Same cycle as egg retrieval<\/td>Subsequent cycle<\/td><\/tr>
Body state<\/td>Still recovering from stimulation<\/td>Fully recovered<\/td><\/tr>
Uterine environment<\/td>Hormones may not be optimal<\/td>Controlled preparation<\/td><\/tr>
Compatible with PGT-A<\/td>\u274c Must wait for results<\/td>\u2705 Results ready before transfer<\/td><\/tr>
Flexibility<\/td>Must proceed on cycle timing<\/td>Transfer can be scheduled<\/td><\/tr>
OHSS risk<\/td>Higher<\/td>Lower<\/td><\/tr>
Current preference<\/td>Less common<\/td>\u2705 Now the dominant approach<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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Why FET Is Now Preferred<\/h2>\n\n\n\n

1. Better uterine environment<\/strong> During stimulation cycles, high estrogen levels can make the uterine lining less receptive to implantation. FET allows the lining to be freshly prepared under controlled conditions, separate from stimulation.<\/p>\n\n\n\n

2. Enables PGT-A testing<\/strong> Genetic screening requires time after embryo biopsy. Freezing embryos first is necessary to wait for results before transfer.<\/p>\n\n\n\n

3. Reduces OHSS risk<\/strong> For patients at risk of Ovarian Hyperstimulation Syndrome, cancelling a fresh transfer and proceeding with FET instead significantly reduces complications.<\/p>\n\n\n\n

4. More flexibility<\/strong> FET allows the transfer to be scheduled when both the patient and clinical team are ready, rather than being dictated by cycle timing.<\/p>\n\n\n\n

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The FET Process: Step by Step<\/h2>\n\n\n\n
    \n
  1. Recovery period<\/strong> \u2014 approximately one menstrual cycle<\/li>\n\n\n\n
  2. Uterine preparation<\/strong> \u2014 estrogen and progesterone medication for approximately 12\u201320 days<\/li>\n\n\n\n
  3. Ultrasound monitoring<\/strong> \u2014 to confirm lining thickness and readiness<\/li>\n\n\n\n
  4. Embryo thaw<\/strong> \u2014 performed on the day of transfer<\/li>\n\n\n\n
  5. Embryo transfer<\/strong> \u2014 takes a few minutes, similar to a Pap smear<\/li>\n\n\n\n
  6. HCG blood test<\/strong> \u2014 approximately 10\u201314 days after transfer<\/li>\n<\/ol>\n\n\n\n

    For uterine preparation details \u2192 Uterine Lining Preparation Guide<\/a><\/p>\n\n\n\n

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    FAQ<\/h2>\n\n\n
    \n
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    \n

    Does FET have better success rates than fresh transfer?<\/strong> <\/h3>\n
    \n\n

    Multiple studies show FET outcomes are comparable to or better than fresh transfers, particularly when PGT-A is involved. Individual results depend on each patient’s specific situation.<\/p>\n\n<\/div>\n<\/div>\n

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    Does freezing reduce embryo quality?<\/strong><\/h3>\n
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    With Vitrification technique, post-thaw embryo survival rates are high and quality closely matches pre-freeze quality.<\/p>\n\n<\/div>\n<\/div>\n

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    Is FET more expensive than fresh transfer?<\/strong> <\/h3>\n
    \n\n

    FET has its own costs separate from the main ICSI cycle, but is significantly less expensive than starting a full new stimulation cycle. Your doctor will provide specific figures during treatment planning.<\/p>\n\n<\/div>\n<\/div>\n

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    What if embryos don’t survive the thaw?<\/strong><\/h3>\n
    \n\n

    Your doctor will discuss next steps, which may include a new stimulation cycle. Survival rates with Vitrification are high.<\/p>\n\n<\/div>\n<\/div>\n

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    How long does the FET process take from start to result?<\/strong><\/h3>\n
    \n\n

    From the start of uterine preparation to the HCG test typically takes 4\u20136 weeks.<\/p>\n\n<\/div>\n<\/div>\n

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    Where can I book FET at GFC?<\/strong> <\/h3>\n
    \n\n

    Line @gfcclinic or call 097-484-5335.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n

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    Summary<\/h2>\n\n\n\n

    FET (Frozen Embryo Transfer) involves transferring thawed embryos in a separate cycle after the body has recovered from stimulation. It’s now the preferred approach because it provides a better uterine environment, supports PGT-A testing, reduces OHSS risk, and offers more scheduling flexibility.<\/p>\n\n\n\n

    \u2192 Compare fresh vs frozen in detail \u2192 Fresh vs Frozen Embryo Transfer<\/a> \u2192 ICSI at GFC \u2192 ICSI Treatment<\/a> \u2192 Book a Consultation<\/a> or Line @gfcclinic | Tel: 097-484-5335<\/p>\n","protected":false},"excerpt":{"rendered":"

    During ICSI treatment, one of the key decisions your doctor will discuss with you is…<\/p>\n","protected":false},"author":22,"featured_media":31947,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[448],"tags":[],"class_list":["post-38285","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/posts\/38285","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/comments?post=38285"}],"version-history":[{"count":1,"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/posts\/38285\/revisions"}],"predecessor-version":[{"id":38286,"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/posts\/38285\/revisions\/38286"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/media\/31947"}],"wp:attachment":[{"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/media?parent=38285"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/categories?post=38285"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/genesisfertility.co.th\/en\/wp-json\/wp\/v2\/tags?post=38285"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}