Testosterone Requirements
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Short version: you do not need to be on testosterone for top surgery, hysterectomy or most other procedures under current guidelines. You do effectively need it for metoidioplasty, and most surgeons and funders want it before phalloplasty. Where it is not required, being on T still changes what the surgeon is working with, so it is worth understanding the effect on each procedure before deciding.
What the guidelines say
The WPATH Standards of Care (SOC8) do not require hormones before chest surgery. For gonadectomy (hysterectomy with oophorectomy) and genital surgery, SOC8 recommends a minimum of six months on hormones, but with an explicit exception: hormones are not required if they are not clinically indicated or you do not want them. That exception exists mainly for non-binary people and for people who cannot take testosterone for medical reasons.
Older rules persist, though. Many US insurers still write twelve months of continuous hormone therapy into their genital surgery policies. NHS England's surgical pathway asks for twelve months on hormones before genital surgery where clinically appropriate. Individual surgeons set their own requirements on top of that. See WPATH SOC8 Criteria for the full picture and Insurance Coverage, Appeals and Denials for how to challenge a requirement that goes beyond SOC8.
Procedure by procedure
Top surgery. No requirement in SOC8, no requirement from the NHS, and most private surgeons will operate without it. Where insurers require hormones for chest surgery, it is usually a leftover from old policy language and is worth appealing.
What T changes: it redistributes fat away from the chest and hips over one to two years, and it can slightly reduce breast tissue volume. Some surgeons say that people who have been on T for a year or more get a flatter result, particularly with peri-areolar or keyhole techniques where the surgeon has less freedom to remove tissue. Others say the difference is minor next to skin elasticity and starting size. If you are not on T and do not plan to be, that is fine, but it is worth asking your surgeon whether it changes their recommended technique. See Which Technique.
Hysterectomy and oophorectomy. SOC8 recommends six months of hormones first unless not indicated or wanted. Surgeons themselves often have no hormone requirement; the operation is the same either way. The bigger issue is what happens after: if the ovaries are removed and you are not on testosterone, you will need some form of hormone replacement to protect bone density. That conversation should happen before surgery, not after. See Fertility Preservation if you want options kept open.
Metoidioplasty. This is the one where testosterone is not just recommended but effectively essential. Metoidioplasty releases and repositions the clitoris after it has grown under testosterone. Without that growth there is very little to work with. Most surgeons want at least one to two years on T before they will assess you, and some set no fixed period but want growth to have plateaued. Topical DHT or testosterone applied to the clitoris is sometimes used in the months before surgery to encourage additional growth; the evidence is thin and it is not standard everywhere, so treat it as something to ask about rather than expect.
Phalloplasty. The flap itself does not depend on hormones, so testosterone is not physically necessary in the way it is for metoidioplasty. Most surgeons and funders require it anyway, usually for the six or twelve months in their policy, and many surgeons want you on it for the effect on the clitoris (which is typically buried or incorporated in the base of the phallus) and on genital skin. Phalloplasty without any testosterone is possible and has been done for people who cannot take it, but you will need to find a surgeon willing to do it and, if a funder is involved, argue the exception.
Facial and body masculinization. No hormone requirement. But testosterone does a lot of the work these procedures do, particularly to facial fat, jaw and brow appearance, and body fat distribution. Most surgeons will suggest waiting two or more years on T before deciding what, if anything, still needs surgery, because the answer changes. See Facial Masculinization and Body Masculinization.
Stopping T around surgery
A separate question, and a common one. Some surgeons ask you to pause testosterone for two to four weeks before surgery over concerns about clotting or bleeding. The evidence for that is weak; studies have not shown that continuing testosterone increases complications, and many surgeons have dropped the pause. Others keep it for reasons of protocol or because their anaesthetist prefers it. Do not stop without asking; follow whatever your surgeon tells you and, if they want a pause, ask why. Testosterone and Surgery covers this in more detail, including injection timing around your surgery date.
If you do not want testosterone at all
You can still have top surgery and hysterectomy without much difficulty. Genital surgery is harder to access but not closed to you; metoidioplasty is essentially off the table without T, phalloplasty is possible with the right surgeon. The main practical advice is to make sure your letter writer addresses it directly, stating that hormones are not desired and that this does not change the assessment. Funders are far more likely to accept a documented reason than a silence. See Surgery Access for Non-Binary People for the wider picture.
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