Is a BBL Safe? The Serious Risk and How It Is Reduced
Updated: 11 hours ago
Medical editor: Dr. Semih Yıldız, plastic, reconstructive and aesthetic surgeon (FEBOPRAS) · Last updated: October 2026
A Brazilian butt lift (BBL) has one specific serious risk, fat embolism, which is rare. Plastic surgery societies that investigated it found that it was linked to fat placed into or beneath the buttock muscle. Placing fat only in the layer under the skin and checking during the operation that it stays there, together with careful patient selection, sensible volumes and recovery precautions, reduces this risk considerably, although no surgeon can make any operation risk-free.
Understanding this risk calmly is part of making a good decision. On our page about Brazilian butt lift surgery in Istanbul, placing fat only under the skin is described as the key safety measure in every operation. The sections below explain why it matters and what else contributes to safety.
What fat embolism means
During a BBL, fat is injected through a thin, blunt tube called a cannula. Fat embolism occurs when fat enters a damaged vein and travels with the blood to the heart and lungs, where it can block blood flow. A large fat embolism during or soon after surgery is a medical emergency and can be life-threatening, which is why it is taken so seriously even though it is rare.
The large veins of the buttock run deep, within and beneath the gluteus maximus muscle. When plastic surgery societies reviewed deaths after BBL, they found fat inside the gluteal muscle. A 2022 review of BBL deaths in South Florida found it in every case examined at autopsy, even though the surgeons had documented a technique meant to keep the fat under the skin. These findings changed how the operation is performed, and they are why current guidance asks not only where the fat should go, but also how its position is confirmed during the operation.
Why the layer under the skin is the safe zone
Two layers matter here: the fat under the skin (the subcutaneous layer) and, beneath a firm sheet of connective tissue called fascia, the gluteal muscle. The large veins linked to fat embolism lie deep in and under the muscle, not in the subcutaneous layer.
International safety recommendations are therefore clear: fat is placed only in the subcutaneous layer and never into the muscle. In cadaver studies, the fascia over the muscle acted as a barrier as long as it was intact: fat injected above an intact fascia stayed under the skin, but where the fascia had a defect, fat tracked down beneath the muscle. Because a cannula can slip deeper without the surgeon intending it, the recommendations also stress constant awareness of the cannula tip, patient positioning that favours a shallow approach and cannulas that resist bending.
After these recommendations were adopted, surveys of plastic surgeons reported a clear fall in fatal complications. In Dr. Semih Yıldız’s practice, placing fat only under the skin, never into the muscle, is the key safety measure in every BBL.
How the layer is confirmed during the operation
Aiming for the layer under the skin is the first step, but the South Florida autopsies showed that intention, even when documented, is not always enough. Since 2022, guidance has therefore added a further step: checking the position of the cannula with real-time ultrasound while the fat is injected. The US-based Aesthetic Society (ASAPS) recommended in its 2022 practice advisory that the cannula position be documented with ultrasound before and during injection, the British Association of Aesthetic Plastic Surgeons (BAAPS) stated the same year that intraoperative ultrasound must be used, and Florida has required ultrasound guidance by law since July 2023.
The same guidance also looks at the surgeon's workload and role. The 2022 advisory recommends no more than three BBLs per surgeon per day, because fatigue and distraction are thought to play a part in fatal complications, and the Florida law does not allow the surgeon to delegate the procedure to a nurse or assistant. The evidence for ultrasound is still limited and comes mainly from studies without a comparison group, but these societies now recommend it as part of safe practice.
In Dr. Semih Yıldız’s practice, the placement of the fat is checked with ultrasound during every BBL. He performs both the liposuction and the fat transfer himself, and he does at most one BBL a day.
Who is a suitable candidate
Safety starts with choosing the right patient and the right plan:
Good general health and a stable weight
Enough donor fat in areas such as the abdomen, flanks or back
No smoking or nicotine for at least 4 weeks before surgery and at least 4 weeks afterwards
A check of your medicines and supplements, because some, such as blood thinners, aspirin, ibuprofen, fish oil and certain herbal products, may have to be stopped for a while
Realistic expectations about the size that can be reached safely in one session
Heart or lung disease, a previous blood clot or a clotting disorder need careful assessment and can make the operation unsuitable. Previous injections into the buttocks, especially of unknown substances, should always be mentioned, because they change the tissue and the plan. If you have very little body fat, buttock implants or a combination of implants and fat may be the more suitable option.
Why more fat is not safer
The amount of fat that can be placed in one session is limited by how much the subcutaneous layer can hold. Going beyond that limit raises the pressure in the tissue, which harms fat survival, and invites placing fat deeper, where the danger lies. Surgeons therefore generally advise staging, with a second session months later, rather than injecting deep when a goal needs more fat than this layer can take.
Large-volume liposuction also puts more strain on the body through fluid shifts and blood loss, and combining a BBL with other operations, such as a tummy tuck, makes the operation longer. This is why the plan, the volume and the technique are decided individually, and combinations are agreed only after assessment.
Precautions around the operation
The operation takes place in hospital under general anaesthesia, usually lasts 2–4 hours, and most patients stay one night. Several steps after surgery also protect your safety:
Walking starts early, which lowers the risk of blood clots.
The compression garment is worn for about 6 weeks to control swelling in the liposuction areas.
Wound checks during your stay of about 7 days take place before you are cleared to fly.
On the flight home, regular breaks to walk and enough fluids lower the risk of clots from long sitting.
Warning signs that need urgent help
Most problems after a BBL are not dramatic: a fluid collection, an uneven area, a firm spot of fat necrosis or some loss of volume. These are handled at check-ups. A few symptoms, however, need immediate medical attention:
Sudden shortness of breath, chest pain or a racing heartbeat
Confusion, unusual drowsiness or fainting
Pain, swelling or warmth in one calf
Fever, spreading redness or a swelling that keeps growing
Breathing problems, chest pain or confusion need emergency care straight away: call 112 in Turkey, or your local emergency number once you are home. The other signs should be reported to your surgical team without delay.
Questions worth asking any surgeon
Whoever you consult, it is reasonable to ask in which layer the fat will be placed, how much fat is planned and what happens if your goal needs more, where the operation takes place and who provides the anaesthesia. It is also worth asking how the position of the cannula is confirmed during the operation (for example with real-time ultrasound), who performs the liposuction and the fat transfer, and how many BBLs the surgeon performs that day. Clear, specific answers are a good sign. The benefits, limits and alternatives of a BBL, including implants, belong in the consultation and the informed consent, and the technique and recovery are covered on our BBL overview page.
Frequently asked questions
How rare is fat embolism after a BBL?
It is rare, and surveys of plastic surgeons reported a clear fall in fatal cases after the recommendation to place fat only under the skin was adopted. Exact figures vary between studies and countries, so no single number applies to every setting. What matters for you is how the fat is placed, how much is planned and how carefully you are assessed and monitored.
Are buttock implants a safer alternative?
Implants avoid the specific risk of fat embolism, but they carry their own risks, such as wound healing problems, infection or implant displacement, and a different recovery. They are mainly considered when there is too little fat to transfer, alone or combined with fat. Which option suits you depends on your body fat, your goals and your health.
Does combining a BBL with a tummy tuck increase the risk?
Combining the two makes the operation longer and adds a larger wound to heal, which increases the overall strain on the body and makes clot prevention even more important. For suitable patients it is a common combination, because fat removed during the tummy tuck and liposuction can be transferred in the same operation. Whether it is advisable for you is decided after assessment.
If you would like your own risk factors and options to be assessed, you can send front, side and back photos with your medical history for a free online assessment.
This article provides general information and does not replace a medical consultation. Results vary from person to person.
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