Abnormal Circulating Reverse T3 Concentration C6055352
Reverse T3 is an inactive form of thyroid hormone. Abnormal levels often occur during severe illness or chronic disease and may affect metabolism. Treatment focuses on the underlying condition.
Key facts at a glance
- ICD-10
- E34.9
- ICD-11
- 5A00.0
- Body system
- endocrine
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Hypotension
Abnormally low blood pressure that may cause dizziness or lightheadedness.
Seek emergency care for severe hypotension with fainting, confusion, or difficulty breathing.
Fatigue
(constitutional)Persistent tiredness and lack of energy that is not relieved by rest.
Frequency: 70-80% of patients
Cold intolerance
(constitutional)Feeling unusually cold, especially in the hands and feet, due to slowed metabolism.
Frequency: 50-60% of patients
Bradycardia
(cardiovascular)Abnormally slow heart rate, typically below 60 beats per minute.
Frequency: 40-50% of patients
Constipation
(gastrointestinal)Infrequent bowel movements with difficulty passing stools.
Frequency: 40-50% of patients
Dry skin
(dermatologic)Rough, flaky, or itchy skin that may appear pale or cool to the touch.
Frequency: 35-45% of patients
Cognitive impairment
(neurologic)Difficulty with concentration, memory problems, or mental fogginess.
Frequency: 15-25% of patients
Weight gain
(constitutional)Unexplained increase in body weight, often modest and due to fluid retention and slowed metabolism.
Frequency: 40-50% of patients
Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Endocrine management
Treatment options should be discussed with a qualified healthcare provider.
Thyroid Function Monitoring
Regular monitoring of thyroid hormones including reverse T3, T3, T4, and TSH to assess thyroid status and track changes over time.
Stress Reduction and Sleep Optimization
Implementation of stress management techniques including mindfulness, relaxation exercises, and sleep hygiene practices to support healthy thyroid hormone conversion.
Additional treatment options
Nutritional Support for Thyroid Function
Dietary modifications emphasizing selenium-rich foods, adequate protein intake, and avoidance of goitrogens to support optimal thyroid hormone metabolism.
dietaryThyroid Hormone Replacement Therapy
If underlying hypothyroidism is confirmed, thyroid hormone replacement may be considered based on comprehensive thyroid assessment and clinical symptoms.
medicationAdrenal Support Protocol
Support for adrenal function through adaptogenic herbs and stress reduction, as adrenal dysfunction can affect reverse T3 metabolism and thyroid hormone conversion.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Abnormal Circulating Reverse T3 Concentration C6055352?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Ross DS, Burch HB, Cooper DS, Greenlee MC, Laurberg P, Maia AL, Rivkees SA, Samuels M, Sosa JA, Stanici MN, Walter MA. 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis. Thyroid. 2016;26(10):1343-1421.
Warner MH, Beckett GJ. Mechanisms behind the non-thyroidal illness syndrome: an update. J Endocrinol. 2010;205(1):1-13.
Chatzitomaris A, Hoermann R, Midgley JE, Hering S, Urban A, Dietrich B, Abood A, Klein HH, Dietrich JW. Thyroid Allostasis-Adaptive Responses of Thyroid Hormone System During Diseases and Beyond. Front Endocrinol (Lausanne). 2017;8:161.
Jonklaas J, Bianco AC, Bauer AJ, Burman KD, Cappola AR, Celi FS, Cooper DS, Kim BW, Peeters RP, Rosenthal MS, Sawka AM. Guidelines for the treatment of hypothyroidism: prepared by the American Thyroid Association Task Force on Thyroid Hormone Replacement. Thyroid. 2014;24(12):1670-1751.
Fliers E, Bianco AC, Langouche L, Boelen A. Thyroid function in critically ill patients. Lancet Diabetes Endocrinol. 2015;3(10):816-825.
van de Sande SA, Diness BL, Ertl C, Witte CU, Liu D, van der Geyten S, Leuschner G, Gurnsey M, Langouche L, Boelen A. Reverse T3 as a member of the 3,5,3'-triiodothyronine regulatory network: a systematic review. Eur Thyroid J. 2023;12(2):e220155.
Demers LM, Spencer CA. Laboratory Medicine Practice Guidelines: Laboratory Support for the Diagnosis and Monitoring of Thyroid Disease. Clin Endocrinol (Oxf). 2003;58(2):138-155.
Peeters RP, van der Geyten S, Wouters PJ, Darras VM, Toet H, Van Herck E, Van den Berghe G. Tissue thyroid hormone levels in critical illness. J Clin Endocrinol Metab. 2005;90(12):6402-6409.
McIver B, Gorman CA. Euthyroid sick syndrome: an overview. Thyroid. 1997;7(1):125-132.
Bianco AC, Salvatore D, Gereben B, Berry MJ, Larsen PR. Biochemistry, cellular and molecular biology, and physiological roles of the iodothyronine selenodeiodinases. Endocr Rev. 2002;23(1):38-89.
Medication Comparisons
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This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy