Understanding Thyroid & Thyroid Eye Disease (TED) Terminology

Medical language can sometimes feel like a secret code, especially when it comes to thyroid conditions and Thyroid Eye Disease (TED). Patients, caregivers, and even healthcare professionals often use abbreviations, acronyms, and shorthand that are confusing at first glance.

This guide is designed to demystify the jargon and provide a comprehensive glossary of terms you are likely to encounter in appointments, test results, prescriptions, or online discussions about thyroid and eye health.

Whether you are managing hypothyroidism, hyperthyroidism, Graves’ Disease, Hashimoto’s Disease, or TED, this glossary will help you:

  • Understand medical notes and lab results.
  • Communicate more effectively with your healthcare team.
  • Feel confident navigating your thyroid and eye care journey.

The guide is divided into logical sections (surgery & treatments, medications, tests, eye-specific terms, and patient shorthand), followed by a complete alphabetical list for quick reference.

🧠 Surgery & Treatments

AbbreviationMeaning
TTTotal Thyroidectomy – complete removal of the thyroid gland
PTPartial Thyroidectomy – partial removal of the thyroid
HTHemithyroidectomy – removal of one lobe of the thyroid
RAIRadioactive Iodine – treatment often used for hyperthyroidism or thyroid cancer
RTRadiotherapy – targeted radiation treatment
OROrbital Radiotherapy – radiation focused on the eye sockets (orbits)
ODOrbital Decompression – surgical procedure to relieve pressure behind the eyes

🧩 Thyroid & Parathyroid Terms

AbbreviationMeaning
ParaParathyroids – small glands near the thyroid that regulate calcium
PTHParathyroid Hormone – regulates calcium and phosphorus balance

⚖️ Common Thyroid Conditions

AbbreviationMeaning
GDGraves’ Disease – autoimmune cause of hyperthyroidism
HDHashimoto’s Disease – autoimmune cause of hypothyroidism
TEDThyroid Eye Disease – inflammation affecting tissues around the eyes
GOGraves’ Ophthalmopathy – another term for Thyroid Eye Disease
PTMPretibial Myxedema – skin thickening on the shins linked to Graves’ Disease
MNGMultinodular Goitre – enlarged thyroid with multiple nodules
HypoHypothyroidism
HyperHyperthyroidism

💊 Medications & Hormone Replacements

AbbreviationMeaning
Levo / LT4Levothyroxine – synthetic T4 thyroid hormone
LT3Liothyronine – synthetic T3 thyroid hormone
CarbCarbimazole – antithyroid drug
MMIMethimazole – antithyroid drug (similar to Carbimazole)
PTUPropylthiouracil – another antithyroid drug
NDTNatural Desiccated Thyroid – animal-derived thyroid hormone
ATD / ATMAnti-Thyroid Drugs / Medication
PPIProton Pump Inhibitor – reduces stomach acid, sometimes given with thyroid meds

🩺 Healthcare Professionals & Systems

AbbreviationMeaning
EndoEndocrinologist – hormone specialist doctor
GPGeneral Practitioner – primary care doctor
ICBIntegrated Care Board – NHS organization managing local health services (UK)
PCGPrimary Care Group – coordinates community health services

🧪 Tests, Hormones & Antibodies

AbbreviationMeaning
TSHThyroid Stimulating Hormone – regulates thyroid function
FT4Free Thyroxine (T4) – measures thyroid hormone level
FT3Free Triiodothyronine (T3) – measures active thyroid hormone level
RT3Reverse T3 – inactive form of T3
TRHThyrotropin-Releasing Hormone – from hypothalamus, triggers TSH release
TRAbThyroid Receptor Antibody – found in autoimmune thyroid conditions
TSIThyroid Stimulating Immunoglobulin – causes overstimulation of thyroid in Graves’
TBIIThyrotropin-Binding Inhibitor Immunoglobulin – interferes with TSH binding
TgAbThyroglobulin Antibodies – may indicate thyroid autoimmune disease
TPOAbThyroid Peroxidase Antibodies – marker for Hashimoto’s and Graves’
TSab / TBab / -NStimulating, Blocking, and Neutral Antibodies – different immune responses in thyroid disease

👁️ Thyroid Eye Disease (TED) Specific

AbbreviationMeaning
CASClinical Activity Score – measures inflammation and activity of TED
ODOrbital Decompression – eye surgery to reduce pressure
IOPIntraocular Pressure – pressure inside the eye, often monitored in TED or glaucoma
SLTSelective Laser Trabeculoplasty – laser treatment to reduce intraocular pressure

🧍 Patient & Clinical Shorthand

AbbreviationMeaning
PxPatient
DxDiagnosis
RxPrescription

🔤 Alphabetical List of Abbreviations

AbbreviationMeaning
-NNeutral Antibodies (aka cleavage)
ATD / ATMAnti-Thyroid Drugs / Medication
CarbCarbimazole
CASClinical Activity Score (TED inflammation measure)
DxDiagnosis
EndoEndocrinologist
FT3Free Triiodothyronine (T3)
FT4Free Thyroxine (T4)
GDGraves’ Disease
GOGraves’ Ophthalmopathy
GPGeneral Practitioner
HDHashimoto’s Disease
HTHemithyroidectomy
ICBIntegrated Care Board
IOPIntraocular Pressure
Levo / LT4Levothyroxine
LT3Liothyronine
MNGMultinodular Goitre
MMIMethimazole
NDTNatural Desiccated Thyroid
ODOrbital Decompression
OROrbital Radiotherapy
ParaParathyroids
PPIProton Pump Inhibitor
PTPartial Thyroidectomy
PTMPretibial Myxedema
PTHParathyroid Hormone
PTUPropylthiouracil
PxPatient
RAIRadioactive Iodine
RTRadiotherapy
RT3Reverse T3
RxPrescription
SLTSelective Laser Trabeculoplasty
TBabBlocking Antibodies
TBIIThyrotropin-Binding Inhibitor Immunoglobulin
TSabStimulating Antibodies
TgAbThyroglobulin Antibodies
TPOAbThyroid Peroxidase Antibodies
TRAbThyroid Receptor Antibody
TRHThyrotropin-Releasing Hormone
TSHThyroid Stimulating Hormone
TSIThyroid Stimulating Immunoglobulin
TTTotal Thyroidectomy
TEDThyroid Eye Disease
HypoHypothyroidism
HyperHyperthyroidism

TEDct exists to improve the lives of those with thyroid eye disease by developing a supportive community of patients and professionals.

If you are a TED sufferer looking to connect with other people facing similar experiences with TED, consider joining our private Facebook group, Thyroid Eye Disease Support UK. It’s a great space for sharing support and insights with fellow TED warriors.

Become a Member: TEDct membership includes many benefits and is FREE for everyone.