Internal Medicine & Oncology Service

I-131 Radioactive Iodine Treatment for Feline Hyperthyroidism

WAVES HOSPITAL

Want to know more about hyperthyroidism and I-131?

Please see the list of questions we are commonly asked regarding I-131 treatment.

I-131  Radioactive Iodine Treatment for Feline Hyperthyroidism

What is hyperthyroidism?

Hyperthyroidism describes an increased hormone production by the thyroid gland. This is a very common disease in middle-aged to old cats. In over 95% of cats, hyperthyroidism is caused by the development of benign tumour (adenoma) or hyperplastic nodules of the thyroid gland. In rare cases, hyperthyroidism is caused by a malignant tumour.

Thyroid hormones have a wide range of functions in the body and an excess of these lead to various clinical signs. The most common clinical signs include weight loss, increased appetite, vomiting, diarrhoea, drinking and urinating more, and nervousness or hyperactivity. Thyroid hormone affects the heart, causing fast heart rate, heart murmurs, abnormal heart beats, and high blood pressure.

What are the treatment options for feline hyperthyroidism?

There are several therapies for the management of hyperthyroidism:

  1. Anti-thyroid medication (methimazole and carbimazole)
  2. Surgery to remove the thyroid gland(s)
  3. Diet
  4. Radioactive iodine therapy.
How does I-131 work?

Radioiodine treatment is considered the gold standard treatment for hyperthyroidism.

The goal of radioiodine treatment is to destroy the abnormal thyroid tissue that is producing the excess of thyroid hormones. The thyroid gland naturally takes up iodine from the blood to produce thyroid hormones. Treatment with radioiodine ‘utilizes’ this natural iodine uptake mechanism. I-131 is given as a capsule by mouth and once the radioiodine is absorbed it is actively taken up into the thyroid gland, preferentially by the abnormal thyroid tissue. The accumulated I-131 then causes destruction of the abnormal thyroid cells resulting in a decrease in thyroid hormone production.

The dose is calculated for each cat individually based on severity of clinical signs and elevation of thyroid hormones. Unlike medication or a low-iodine diet, administration of radioiodine can provide a permanent cure for feline hyperthyroidism. It is also almost always a one-off treatment; less than 5% of the cats needing a second dose. Most cats will have normal hormone levels within 1 or 2 weeks of I-131 treatment although it can take up to 6 months to take full effect.

What is involved in radioiodine treatment at WAVES?

The first step is to confirm diagnosis of hyperthyroidism and to ensure there are no diseases in your cat that would complicate or prohibit radioiodine treatment. Your cat will be booked in for a consultation with one of our internal medicine veterinarians. During this consultation, the clinician will review your cat’s history and laboratory results and we will perform a physical examination. Unless recently performed by a reference laboratory, blood/ urine tests will be required. Further diagnostic testing may be required if concerns for concurrent disease arise during this consultation and examination, and this will be discussed with you. The medicine clinician will also discuss alternative treatment options for hyperthyroidism in your cat so that you can make an informed decision whether or not to pursue radioiodine treatment. Once we have established that your cat is suitable for treatment with radioiodine and you have agreed to this, we will book an admission time for the treatment.

Why choose WAVES for my cat’s radioiodine treatment?

The assessment and treatment of your cat will be overseen by one of WAVES Internal Medicine Specialists, in a state-of-the-art radioiodine treatment facility.  WAVES is the only Radioactive iodine unit for cats in Perth that is run by specialists in internal medicine.

Are you a pet owner and still have more questions?

Click here to download our client brochure.

Are you a veterinarian and looking to refer a patient for treatment?

Click here to download our veterinary brochure.

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Dr Rebecca Nilsen BSc BVMS (Hons) MANZCVS (Small Animal Dentistry and Oral Surgery) President Australian Veterinary Dental Society

Dr Rebecca Nilsen owns and operates The Smiling Pet Veterinary Dental Services and WAVES Dentistry. Rebecca graduated from Murdoch University in 2012, working in general practice and emergency medicine. It was during this time that Rebecca noted a need for improvement in veterinary dental care and in 2018 completed her memberships in Small Animal Dentistry and Oral Surgery with the Australian and New Zealand College of Veterinary Scientists. Since 2018 Rebecca has worked exclusively in dentistry as a referral vet for more than 160 clinics in Perth and regional areas. Rebecca practices with the ethos that every animal deserves a pain free mouth. When not at work Rebecca enjoys spending time at the beach with her loveable rescue dog Libby, and catching up with family and friends.


Dr Liv Oginska DVM MRCVS PGCert SAS MAPP

Dr Liv Oginska is a veterinarian, keynote speaker, positive psychology coach, a certified workplace conflict mediator and an emotional intelligence specialist who' 'speaks Human'. For the last 4 years, Liv devoted her veterinary career to supporting both individuals and teams (especially leaders) in becoming more human-savvy. The human-savvy work focuses on helping veterinary and medical professionals create psychologically safe organisations, as well as
sustainable and thriving careers. Liv graduated as a veterinarian from the University of Poland in 2010, worked as a veterinarian in multiple countries in Europe, Australia and North America, and she gained experience and credentials in positive psychology, emotional intelligence and conflict mediation in Cambridge, UK. Currently, she teaches emotional intelligence at Murdoch University Vet School in Perth, Australia, and she pursues PhD in the topic of emotional competencies among veterinary teams and leaders.


Dr Meng Siak BVMS MANZCVS (Canine Medicine) FANZCVS (Veterinary Dermatology)

Dr Meng Siak graduated from Murdoch University in 2006. He spent a year in private practice before returning to Perth to pursue his dream. From 2008 to 2014, he underwent rigorous training, starting as an intern and then as a resident in Veterinary Dermatology. In 2014, his dedication and hard work paid off when he passed the examinations to become a Specialist Veterinary Dermatologist with the Australian and New Zealand College of Veterinary Scientists (ANZCVS).
In 2018, Meng established WAVES dermatology, reconnecting with former colleagues and friends. With the help of his peers, the dermatology clinic has flourished over the last six years, and is now a thriving dermatology service. Meng's passion for continuing education is well known, having served as the Oceania/Asia representative for the Global Veterinary Dermatology Education Group (GVDEG), a non-profit organization dedicated to providing continued education in underserved countries around the world, from 2018 to 2022. In addition, he has also been invited to speak at national and international conferences, including WSAVA 2018 and World Congress Vet Dermatology 2020, cementing his reputation as an expert in his field.


Christie Boucher

With 25 years of experience in education, Christie commenced her career as a secondary school health and physical education teacher. Over the past 20 years, her professional focus has centred on creating and implementing risk management education resources and programs tailored for diverse professional audiences. Christie possesses a keen interest in the role that education plays in risk management by contributing to heightened awareness and behavioural change. Christie is the Risk Services Manager at Guild Insurance.


Dr Paul Davey OAM BSc BVMS

Dr Paul Davey graduated from Murdoch University Vet School in 1992, and has spent over 30 years in small animal practice. He has been a partner in 5 small animal veterinary clinics, and is currently a Clinical Director and Chair of the Clinical Advisory Committee for CVS Vets Australia. He remains connected to Murdoch as a Banksia Association Member, and Senior Adjunct Lecturer in Professional Practice. He was President of the WA Division of the AVA in 2011 and 2013 and prior to that was heavily involved in Graduate Support Programs and Mental Health Initiatives for which he received an Order of Australia Medal. In December 2021 he was elected to the Veterinary Surgeon’s Board, and in July 2022 was selected as the first official member of the new Veterinary Practice Board of WA. Paul is passionate about supporting veterinarians throughout their careers, and is very excited to be part of this terrific program.


Dr Jonathan Wood BVSc GP Cert (Ophthal) MRCVS MANZCVS (Small Animal Medicine)

Dr Jonathan Wood graduated from Sydney University in 2006 and travelled to the United Kingdom shortly after graduation. Jonathan worked as a small animal vet in the UK in a busy mixed practice on the Isle of Wight. Since referral practices were on the mainland, he set about learning as much about ophthalmology as he could. In 2011, he passed a post-graduate examination in Veterinary Ophthalmology.

In 2012, Jonathan returned to Australia, settled in Western Australia, and has been involved in ophthalmology since then.

Jonathan joined Perth Animal Eye Hospital in 2021, completing a residency in Veterinary Ophthalmology. In 2023, he was admitted as a member of the Australian and New Zealand College of Veterinary Scientists after passing the Small Animal Medicine examination. He has a keen interest in retinal diseases and the management of glaucoma.

Jonathan currently works at Perth Animal Eye Hospital as an Ophthalmology Registrar


Dr Ellie Drynan BVSc MANZCVS DACVAA

Dr Ellie Drynan graduated from the University of Sydney in 2002. Following graduation she worked in both mixed and small animal practice in Melbourne, London and then back here in Perth. In 2007 she commenced an anaesthesia residency at Murdoch University and in 2013 obtained her Diplomate of Anaesthesia and Analgesia. In 2017 she joined the WAVES family providing an anaesthesia service for all animals but particularly for the critically-ill patients.


Dr Katrin Swindells BVSc MANZCVS DACVECC

Katrin is a 1994 Sydney University graduate who spent three years in small animal practice before finding that emergency work was her vocation. In 2001, she started a residency at Murdoch University, became a Diplomate of the American College of Veterinary Emergency and Critical Care in 2006 and then spent five years in academia at Murdoch.

Katrin is a director of WAVES and has worked there as a criticalist since opening in 2013. She remains fascinated by all aspects of ECC and is passionate about helping the veterinarians, interns and residents who work with her, develop their emergency and critical care skills in a supportive environment. She is also committed to providing advice and support to the profession on their difficult cases.

Katrin has three children (two of whom are adults) and a very supportive husband who was essential to making everything possible.


Dr Luke Bradley BSc DVM MANZCVS (Avian Medicine and Surgery, Unusual Pets)

Dr Luke is a special interest Exotic Veterinarian with memberships in both Avian Medicine and Surgery and Unusual Pets, who graduated from the University of Melbourne in 2018. Since graduating Dr Luke has been working for the Unusual Pet Vets in Perth where he is now the Vet Manager at the Murdoch clinic.

Dr Luke grew up with a menagerie of Birds and Reptiles and going down the exotic's pathway was always going to be the only way. If he is not working, then you are most likely to find him working away on his hobby farm amongst the variety of animals and fruit trees in his orchard.


Dr Nicole Lobry de Bruyn BSc BVMS MANZCVS (Feline medicine and Animal Behaviour) 

With over 30 years’ experience as a vet in private practice Dr Nicole is one of the most highly qualified Animal Behaviour Veterinarians in Western Australia. She is one of only a handful of veterinarians in Perth with the highly respected membership in Veterinary Behaviour MANZCVS obtained through examination. 

Nicole helps pass on this passion through the teaching of Animal Behaviour (all species) to undergraduate vet students at Murdoch University.

Nicole is a member of the Australian Veterinary Association and the special interest group in Animal Behaviour. She is also a certified Fear Free Professional.

Dr Nicole can assist clients with any behavioural problem they may be experiencing with their companion animal - canine or feline. She follows the latest scientific approach, relies on a positive communication style with her patients and clients and will work to find the best outcome.


Dr William Gow BSc BVMS DVSc DipACVP (Clin Path) 

Dr William Gow graduated from Murdoch University with a Bachelor of Science, and a Bachelor of Veterinary Medicine and Surgery in 2009. After this, he went on to work in a small animal general practice in Perth, WA, for two years.

William commenced his residency in Veterinary Clinical Pathology in 2012 at the Ontario Veterinary College, University of Guelph in Canada. He also completed a research project and written thesis investigating circulating microRNA profiles in dogs with multicentric lymphoma and was awarded a Doctor of Veterinary Science (DVSc) degree. In 2015, William joined IDEXX as a Clinical Pathologist after completing his residency. In 2018, William achieved his board certification for Clinical Pathology with the American College of Veterinary Pathologists (ACVP).

William’s areas of professional interest include cytopathology, haematopathology and bone marrow pathology, including haematopoietic neoplasms. He also enjoys helping clients with complicated cases.


Dr Zoe Devine BSc BVMS MANZCVS (Veterinary Behaviour)

Dr Zoe developed her passion for behavioural medicine early in her career, as she believes the mental well-being of an animal is just as important as the physical. Since graduating from Murdoch University in 2017, she has worked in several clinics, including interstate, to refine her skills in treating both physical and mental diseases in all species.

Dr Zoe holds her membership to the ANZCVS in Veterinary Behaviour, which she obtained in 2022. She was awarded the Robert Jones Award for the highest mark achieved in that year. She is also a Fear Free Certified Professional. Continuing education is important to Zoe, and she has presented on the topic of fear-free handling and other behavioural topics to a number of student and industry groups.

Zoe enjoys the complexities and nuances of behavioural medicine. The human-animal bond is a focus for Zoe and is front of mind within her tailored treatment plans. A holistic approach is implemented, engaging the family unit plus other industry professionals such as vets, vet nurses, trainers, other specialty centres or pet physiotherapists to assist with the behavioural problem


Dr Timothy Foo BSc BVMS MANZCVS (Radiology) MVetStud DipECVDI

Born and raised in Sarawak, Malaysia, Tim made the move to Perth in 2005 before earning his veterinary degree from Murdoch University in 2010. After four years in general practice, his passion for diagnostic imaging led him to the University of Sydney Veterinary Teaching Hospital, where he completed a 4-year residency and achieved board certification in diagnostic imaging in 2019. Sydney wasn't just a career milestone - it was also where Tim met his wonderful wife, the greatest highlight of his time there. 

Swapping Sydney's humidity for Perth's sun-drenched coastline was an easy decision, and Tim joined WAVES in 2019. Tim is focused on expanding WAVES' services and fostering a strong and compassionate imaging team - one that values empathy, patient care and collaboration to ensure the best possible outcomes for every pet. 


Amanda Clews RVN Cert. VNES, TAE

Amanda graduated from Applied Vocational Training in 2006 - She started in small animal practice to build her skills and knowledge whilst also working casually in an Emergency & Critical Care clinic. She joined The Amanda graduated from Applied Vocational Training in 2006 and started her career in small animal practice, gaining valuable experience in Emergency & Critical Care.

In 2016, she joined The Unusual Pet Vets and earned the City & Guilds Nursing of Exotic Species certification in 2017. Since 2018, Amanda has been managing the Murdoch team, she most enjoys managing patients in with emergency & critical care presentations and medical management & treatment for exotic species.

At home, Amanda is surrounded by a diverse range of pets, including a cockatiel, a rainbow lorikeet, two bobtail lizards, two jumping spiders, two badumna spiders and a border collie.


Claire Deamer RVN APVN (AHMW) DipVNZS 

Claire is a dedicated registered veterinary nurse in Perth, Western Australia, who began her veterinary career in 2003 while still at school, working in small animal general practice. Over the years, she has gained experience in various settings, including a university teaching hospital, a pet crematorium, and an emergency center.

She joined The Unusual Pet Vets in 2017 and soon earned her Diploma in Exotic Animal Nursing. Recently, she has embraced her new role as Perth Nursing Trainer for UPV.

Outside of work, Claire enjoys life in the Perth Hills with her husband, three kids, three dogs, one cat, two cockatiels, seven chickens, three emus, a woma python, a tarantula, and a horse. 


Kara Airey Cert IV RVN CCRVN HCert Bus.,Fear Free (TM) Certified

Kara spent the first 15 years of her career as a specialist surgical vet nurse in Perth and in Dublin, Ireland.  Through these roles her passion for caring for patients during their post operative recovery led her to further studies in veterinary rehabilitation.  She returned to Perth in 2022, and finalised her training to become a Certified Canine Rehabilitation Veterinary Nurse in 2024 through the Canine Rehabilitation Institute.

Kara's special interests are in post-surgical and neurologic rehabilitation.  She is a self-proclaimed 'cat lady' with two cats who travelled both to and from Ireland with her. 


Chantelle Alexander RVN

Chantelle Alexander, also known as Channy, began her veterinary journey in 2005 as a kennel hand at Kenwick Vet. Transitioning from general practice to Murdoch University in 2010, she found her true calling in Emergency and Critical Care nursing. With over a decade at WAVES, Channy continues to embrace her love for ECC alongside her WAVES family. Outside of work, she finds joy in her family, friends, and faithful Labrador companion, Tyson. 


Dr Nick Lai BVSc MANZCVS
Registrar in Medical Oncology

Dr Nick graduated from the University of Sydney in 2015, and moved to
Perth to begin a rotating internship in a referral practice.

He attained membership of the Australian and New Zealand College of
Veterinary Scientists (ANZCVS) in Small Animal Medicine in 2019, before
moving back to Sydney to complete a three year residency program in medical
oncology. This residency program has taken him to externships at the
University of California (Davis), the University of Wisconsin (Madison) and
the Harry Perkins Institute of Medical Research.

Nick's clinical interests include canine and feline lymphoma, as well as cancer
immunology.