The Feline Centre is one of only 10 clinics in the UK that is able to treat hyperthyroid cats with radioactive iodine.
Please note there is currently a waiting list, we advise you read the information for vets documents for more details. Please contact reception on 0117 394 0513 to discuss referral and waiting times or submit your request online.
We hope you find the questions below useful. There is also a list of more general questions in our General Info for Owners pages.
Our aim is provide the very best care for your cat at all times and to ensure that radioactive iodine is the most suitable treatment for your cat; we do this by performing a thorough geriatric health check before treatment.
Hyperthyroidism is the most common hormonal disease seen in geriatric cats. The disease is most commonly caused by a tumour in the thyroid gland(s). In 97-99% of cases the tumour is benign (an adenoma or hyperplasia) and rarely is caused by a malignant tumour (carcinoma). The signs seen in hyperthyroid cats are due to high levels of thyroid hormone released by the tumour. Common signs include weight loss, excessive hunger and thirst, vomiting, diarrhoea, agitation and vocalisation. Rarely cats have a form of the disease called ‘apathetic hyperthyroidism’ where they may be lethargic and inappetant, as opposed to showing the more typical signs. In most cats an enlarged thyroid gland(s) can be felt within the neck, however between 5 to 20% of cats may also have ectopic tissue within the chest.
There are four ways that hyperthyroidism can be managed, each with associated pros and cons:
|No requirement for
Most cats can be stabilised
Dose can be titrated to effect
No requirement for
|Long term requirement for daily or twice daily pill administration or application of transdermal cream
Regular blood tests required for monitoring for complications
Possible side effects include skin irritation and lesions, liver damage, development of abnormalities in white blood cells, red blood cells or platelets (clotting cells)
Does not cure the tumour, only blocks the effect of excess secreted hormone, so the tumour will continue to grow
Increasing doses of the drug may be required with long term treatment
|Dietary therapy Iodine restricted diet||Reversible
No requirement for hospitalisation
Not known to be associated with adverse effects and appears to be well tolerated
No requirement for anaesthesia
|Long term requirement for the cat to eat the diet only
May be more difficult to follow in a multi-cat household, if the cat hunts and eats prey or requires medication containing iodine
The cat may only temporarily like the diet
Does not cure the tumour, only blocks the effect of excess secreted hormone, so the tumour will continue to grow
Efficacy in long-term hyperthyroidism is unknown
May not be suitable if the cat requires other specific dietary management of other disease e.g. diabetes
|Surgery||Reduced hospitalisation period required
Technique usually available in first opinion practice
Curative if all hyperactive tissue is accessible to surgeon (i.e. if there is no ectopic tissue within the chest)
Rapidly effective if all hyperactive tissue can be removed
|Period of stabilisation ideally required pre-surgery
Risk of parathyroid gland damage if both glands removed and development of low calcium levels, which may require short-longer term medication
Rarely there can be damage to nerves in the neck leading to Horner’s syndrome +/-laryngeal dysfunction
Only suitable if all of the tissue is within the neck region (up to 20% of cats have additional tissue that is inaccessible)
Disease involves both thyroid glands in 75% cats, hence if unilateral surgery initially performed (i.e. 1 gland is removed), cat may develop hyperthyroidism again at a later date (months-years) and require a second surgery
Irreversible treatment-may unmask kidney disease if previously unstable, period of stabilisation with medicine pre-operatively can be predictive of this; some cats may need thyroid supplementation, if levels drop low post surgery, to support renal function
Rarely curative for thyroid carcinoma due to infiltration of local tissue by tumour
|Radioactive iodine||No anaesthetic required-treatment given as a single injection under the skin with light sedation
Treats all hyperactive tissue regardless of location
High success rate (95%+)
Very few side-effects
No risk of damage to parathyroid glands
Suitable for carcinoma treatment (requires 10x higher dose)
Can be repeated if recurrence at later date or partial drop in hormone level
|Limited availability-around nine centres in the UK
Requires period of hospitalisation (10 days for standard treatment, 14 days for intermediate dose treatment and seven weeks for carcinoma treated cats at Langford)
Effective usually within 2-6 weeks, in some cats full effect takes up to six months
A small proportion of cats require a second treatment
Irreversible treatment-may unmask kidney disease if previously unstable, some cats may need thyroid supplementation, if levels drop low post radioiodine, to support renal function
You need to initially discuss this with your own local vet, who will then be able to refer you to the Feline Centre; as we are a referral hospital we cannot accept requests directly from owners. Initially cats come for an assessment appointment (usually over two days), to determine if they are suitable to receive radioactive iodine.
The assessment, treatment and post-treatment evaluation costs £2,500 including VAT for routine hyperthyroid patients (with benign disease). This includes hospitalisation for up to four weeks following treatment.
The package cost for thyroid carcinoma (malignant form) treatment is £3,000-£3,600 including VAT.
Please note: clients who booked treatment prior to 1 August 2018 will pay the lower prices from the previous financial year.
We strive to provide a pleasant, comfortable and stress-free experience for your cat; our treatment wards have cattery style accommodation with plenty of space for the cats to stretch out and we provide lots of comfortable bedding, hidey-holes, toys and scratching posts to occupy the cats during their stay, we even have cat TV!
As most of the cats with hyperthyroidism are senior or geriatric, it is very common for them to have concurrent disease, which may not be visible from the outside. For this reason your cat will be carefully assessed to see if there are any other major problems, which could change your or our minds as to whether your cat is suitable to receive radioactive iodine.
Secondly once a cat receives radioactive iodine, he/she will be hospitalised in a special ward. If problems arise the cat cannot be brought back to the main hospital, due to health and safety rules and we can only perform nursing treatment. For this reason we do a ‘geriatric MOT’ to minimise the risks as much as possible.
This is a complete check-up. We like to review blood tests (if not performed in the last few weeks by your own vet), analyse urine and measure your cat’s blood pressure. We then perform imaging of the chest, abdomen and heart. We are particularly looking for complications of hyperthyroidism (e.g. high blood pressure and heart disease), as well as concurrent diseases. Secondly if possible we try to assess your cat’s kidney function whilst the hyperthyroidism is well stabilised; 30-50% of hyperthyroid cats also have concurrent kidney disease, which may be hidden when the hyperthyroidism is uncontrolled. It is not unusual to unmask kidney disease by treating the hyperthyroidism but fortunately in most cases this is mild kidney disease that can be treated medically. It is however important to treat the hyperthyroidism appropriately in this situation, to avoid further damage to the kidney.
We usually perform the radioiodine assessment 4-6 weeks in advance of a provisional treatment date, as things can change quite quickly in older cats and to allow time for certain problems to be addressed for example urinary tract infections.
The radioactive iodine injection is usually given on a Thursday or Friday, under a light sedation. Following this your cat is hospitalised in a special radioiodine ward, and looked after by the medicine team nurses, with visits from the primary vet in charge of your cat’s care. The ward is similar to a cattery, with large pens, containing shelves at different levels. We provide various beds (including a cosy cat cabin), scratching posts, a radio and cat nip toys. We even have a cat TV in one ward, with a special cat DVD to entertain the patients! We can feed whatever diet your cat prefers, or requires if he/she is receiving a special prescription diet. We have webcams to be able to check your cat from within the main hospital too (unfortunately this is not accessible externally).
If you wish to provide something from home that you feel will help your cat settle in, we are happy to put that in the pen too, however please be prepared that if there is any contamination we may not be able to allow this to leave the hospital afterwards. Equally if you have a particularly special food that you like to feed your cat, please bring that along too.
The hospitalisation period for cats treated with standard doses currently is 10 days, and for cats treated with intermediate doses 14 days (we determine the dose required based on your cats thyroid hormone level, severity of disease and thyroid tumour size); it is longer for cats being treated for thyroid carcinoma (seven weeks in total). For the standard and intermediate treatment, cats can leave our hospital after 10 and 14 days respectively, provided the following restrictions can be observed (exact timings will be discussed by your clinician)
- maintain your cat indoors for approximately two extra weeks
- avoid contact with young children or pregnant ladies for approximately two extra weeks
- avoid prolonged periods of direct contact with your cat for approximately two extra weeks (e.g. keep out of occupied bedrooms at night)
- handle waste with rubber gloves and double bag any waste before disposing of in general rubbish for approximately three extra weeks.
You can download a full version of the owner FAQs here.
Read the case studies below for client stories and testimonials for our Radioactive Iodine Service, or alternatively head to the link below for further client testimonials for our Feline Centre.
Mary had a successful rapid response to radioactive iodine and sailed through her four week stay at the Feline Centre, without any problems. Mary's owner talks about the experience at Langford…
'I'm immensely grateful to the Langford Veterinary Services and Angie Hibbert for their wonderful care of my cat Mary when she needed treatment for hyperthyroidism. Having driven Mary down from London, I was immediately struck by how quickly Mary relaxed and settled in at the clinic; she wasn't at all agitated and nervous being in a new environment.
The veterinary students were very conscientious when taking Mary's history, even sitting with me and Mary on the floor in order to put Mary at ease.
A thorough set of tests was taken to ensure that Mary was a good candidate for the radioactive iodine treatment, and the clinic was able to board Mary between her tests and the treatment, avoiding unnecessary and stressful trips up and down the M4.
I was anxious about how Mary would react to being in the radioiodine ward while after her injection - probably more anxious than Mary. But the staff at the Langford were thoughtful and considerate, calling every day with updates on Mary's condition, giving me confidence that she was both well and being well cared for.
They were happy for Mary to have her own bedding, toys and food while she was in the ward and I felt sure Mary was getting the best possible care.
At the end of the treatment, I was reunited with a healthy, happy cat, and was given full instructions for Mary's post-treatment home care. Eight months on, and Mary is a gorgeous, calm and affectionate cat - it's as if she's been given a new lease of life. Thank you, Langford!'
Tudor, a 9 year old male Domestic shorthair also came to the Feline Centre in 2011 for radioactive iodine. Tudor had been diagnosed with hyperthyroidism only six weeks earlier and shortly after starting tablets to control the condition developed a severe reaction to the drug.
Tudor became intensely itchy and began to scratch his face causing terrible wounds over his head and neck. It was clear that Tudor was not going to be able to continue medical treatment in the long term and after his assessment we were happy that he would be a good candidate to receive radioactive iodine.
In the interim he was treated with anti-histamines, to control his itchiness and antibiotics, as the skin wounds had become infected.
Tudor also responded very quickly to radioactive iodine treatment, with resolution of his hyperthyroidism on returning to the ward, healing of all of his skin lesions and weight gain.
He was a much happier and relaxed cat, and is back to looking his best again as this photo shows!