WhenATSHIsNeverOrderedAtAll.

Thyroid disorders are common — prevalence of hypothyroidism in the U.S. adult population is estimated in the several-percent range, and a substantial fraction remains undiagnosed at any given time. The disease is not rare and the screening test is not expensive. The missed-diagnosis pattern is almost entirely a failure to order the right lab at the right visit.

The mechanism has four intersecting components:

• Non-specific symptom profile. Fatigue, weight change, cognitive slowing, mood change, cold or heat intolerance, dry skin, hair loss, constipation or diarrhea, menstrual irregularity. Each symptom has a dozen more-common explanations. The pattern of symptoms — particularly when they cluster — is the tell, but only if the provider looks at the record holistically.
• Psychiatric competing diagnosis. Hypothyroidism commonly presents with depressed mood, cognitive slowing, and fatigue. The default interpretation in primary care is often depression. An SSRI gets prescribed, the symptoms do not resolve, and the label becomes “treatment-resistant depression” — which can persist for years before the TSH is finally ordered.
• TSH not in routine screening. Unlike a lipid panel or a CBC, TSH is not part of the default annual workup in most practice patterns. It requires the provider to specifically think of thyroid etiology and order the test. When the thought does not occur, the test does not happen.
• Palpation skill and equipment variation. A thyroid nodule that would be obvious on ultrasound may or may not be felt on exam, depending on the provider’s technique and the patient’s anatomy. A palpated nodule should trigger ultrasound and, where indicated, biopsy — but not all clinicians follow through reliably.

The pattern is consistent: a patient presents over multiple years with fatigue, mood complaints, or weight issues; gets labeled with depression, perimenopause, or somatic disorder; and finally is diagnosed with severe hypothyroidism, Graves disease, or thyroid cancer after hospitalization or a chance specialist visit. The interval between first presentation and correct diagnosis — often measured in years — is the case.

The American Thyroid Association, American Association of Clinical Endocrinologists, and U.S. Preventive Services Task Force have issued guidance on thyroid evaluation. Core requirements that the primary-care record should reflect:

• TSH when symptoms match. Unexplained fatigue, weight change, cognitive slowing, depressed mood, anxiety, menstrual irregularity, constipation, cold or heat intolerance, or a cluster of these — particularly persisting — warrants a TSH. The test is inexpensive and highly sensitive.
• Follow-up testing when TSH is abnormal. Elevated TSH prompts free T4 to confirm primary hypothyroidism and anti-TPO antibodies where autoimmune etiology is suspected. Suppressed TSH prompts free T4, free T3, and TRAb (TSH receptor antibodies) for Graves disease evaluation.
• Nodule workup. A palpable thyroid nodule (or incidental imaging finding) greater than 1 cm warrants thyroid ultrasound. Sonographic features (hypoechogenicity, microcalcifications, irregular margins, taller-than-wide shape) stratify malignancy risk. Nodules meeting criteria require fine-needle aspiration biopsy.
• Appropriate referral. Endocrinology referral is appropriate for hyperthyroidism, subclinical disease where treatment decisions are complex, thyroid nodules, suspected thyroid cancer, and pregnancy-related thyroid dysfunction.
• Pregnancy-related attention. Thyroid dysfunction in pregnancy affects maternal and fetal outcomes. Standard of care includes screening in high-risk patients and prompt treatment of identified dysfunction.
• Recognition of thyroid emergencies. Myxedema coma and thyroid storm require immediate recognition and intensive care. Delay in recognition is a separate malpractice category.

Compare what the record shows against what the standard requires. A patient with documented multi-year fatigue, weight gain, and mood complaints whose chart contains no TSH result has the clearest version of this case. A patient whose abnormal TSH sat in a result log unreviewed has the second-clearest version. Florida malpractice cases for missed thyroid disease are built on these specific omissions.

Hypothyroidism is not a mild inconvenience waiting for treatment — it is active systemic slowing that affects cardiac, neurologic, metabolic, and reproductive function. The consequences of sustained untreated disease:

• Cognitive impairment. Slowed processing, memory difficulty, impaired executive function. Severe untreated hypothyroidism can produce a dementia-like picture (sometimes called hypothyroid encephalopathy) that reverses only partially after treatment if prolonged.
• Treatment-resistant depression. Hypothyroidism produces depressive symptoms refractory to standard antidepressants. Patients labeled “treatment-resistant” often reveal the underlying thyroid picture only when the TSH is finally ordered.
• Cardiac complications. Bradycardia, decreased cardiac output, pericardial effusion, accelerated atherosclerosis from associated dyslipidemia, increased cardiovascular mortality.
• Reproductive and pregnancy complications. Menstrual irregularity, infertility, miscarriage, and — when pregnancy occurs in untreated maternal hypothyroidism — adverse fetal neurodevelopmental outcomes.
• Myxedema coma. The extreme end of untreated or undertreated hypothyroidism: hypothermia, altered mental status, hypoventilation, cardiovascular collapse. Mortality remains substantial even with treatment. An ICU-level emergency that is the direct downstream consequence of a missed diagnosis.

When a patient is hospitalized for myxedema coma after years of being treated for depression or fatigue of unknown cause, the case is not difficult to frame. The injury is the hospitalization, any residual cognitive or cardiac damage, and — in fatal cases — the death. The breach is the TSH that would have prevented it.

Hyperthyroidism is often missed with a different psychiatric frame — anxiety rather than depression. A patient with palpitations, insomnia, tremor, weight loss, and heat intolerance looks panic-attack-like, and that label gets attached. The consequences when the diagnosis is missed:

• Atrial fibrillation. Hyperthyroidism is a recognized precipitant of atrial fibrillation. AF carries stroke risk, particularly when the rhythm is not recognized and not treated. A missed thyroid diagnosis that caused a missed AF diagnosis that caused a stroke is a compound malpractice chain.
• Heart failure. Thyrotoxic cardiomyopathy can develop in sustained untreated hyperthyroidism, producing heart failure that partially reverses with treatment but may leave residual dysfunction.
• Osteoporosis. Accelerated bone turnover in sustained hyperthyroidism leads to reduced bone density and increased fracture risk.
• Thyroid storm. The extreme end: high fever, tachyarrhythmia, altered mental status, cardiovascular collapse. ICU-level emergency with significant mortality even with treatment.
• Psychiatric misattribution. Anxiety, insomnia, and irritability from hyperthyroidism get treated with benzodiazepines or antidepressants that do not address the underlying cause.

Graves disease, the most common cause of hyperthyroidism, has additional features — ophthalmopathy (bulging eyes), pretibial myxedema — that should prompt the diagnosis on exam. When those findings are documented and no TSH is ordered, the breach is particularly clear.

Thyroid cancer — most commonly papillary, followed by follicular, medullary, and anaplastic — is generally indolent compared to other malignancies, which is both the reason delayed diagnosis is survivable and the reason missed diagnoses happen. The workup pathway:

• Palpable nodule or incidental finding. On neck exam, imaging done for another reason, or patient self-examination.
• Thyroid ultrasound. Evaluates size, sonographic features (hypoechogenicity, microcalcifications, irregular margins, taller-than-wide shape, extrathyroidal extension), and regional lymph nodes.
• Fine-needle aspiration biopsy. For nodules greater than 1 cm or smaller nodules with suspicious features. Results stratified per Bethesda classification.
• Surgical management where indicated. Lobectomy or total thyroidectomy depending on histology and features. Lymph node dissection where clinically warranted.
• Radioactive iodine. Post-surgical adjuvant in selected cases.
• Long-term surveillance. Thyroglobulin monitoring and periodic imaging.

Missed thyroid cancer cases typically involve a documented palpable nodule that was not imaged, a suspicious ultrasound that was not biopsied, or a biopsy result that was not communicated or acted on. The cases that are most consequential involve anaplastic thyroid cancer (aggressive, poor prognosis) or medullary thyroid cancer (where family history could have prompted earlier screening) — both of which are more time-sensitive than typical papillary cancer.

These cases are built on a concrete documentary foundation — what labs were and were not ordered, what exam findings were and were not documented, what referrals were and were not made. Key evidentiary sources:

• Primary-care records. All visits in the symptom window, with specific attention to what labs were ordered, what exam was documented (particularly the thyroid exam), and what diagnoses were assigned.
• Lab orders and results. TSH results if any were obtained, and critically, the absence of TSH where symptoms required it.
• Imaging orders and reports. Any thyroid ultrasound, CT of the neck, or incidental findings on other imaging.
• Medication history. Antidepressants, anxiolytics, or other medications prescribed for symptoms that were ultimately thyroid-driven.
• Confirming workup. The eventual TSH, free T4, free T3, thyroid antibodies, ultrasound, or biopsy that established the diagnosis.
• Injury documentation. Cardiology records for atrial fibrillation or heart failure, hospital records for myxedema coma or thyroid storm, oncology records for thyroid cancer staging.

Florida Statute § 766.102 requires a corroborating expert affidavit before filing. The standard expert team is a board-certified endocrinologist for the standard-of-care opinion, paired with an organ-specific specialist for the causation opinion — a cardiologist for atrial fibrillation or heart failure, an oncologist for missed cancer, a neurologist for stroke from thyrotoxic AF.

Damages depend on the specific harm the delay produced. A patient who was treated for treatment-resistant depression for years before the TSH was finally ordered recovers for the years of untreated symptoms and any residual impairment. A patient who had a stroke from undiagnosed thyrotoxic atrial fibrillation recovers for the stroke-related disability. A patient with permanently reduced cardiac function from untreated hypothyroidism or hyperthyroidism recovers across that functional gap.

• Past medical expenses for eventual workup, treatment, hospitalization, and any specialist care.
• Future medical expenses for ongoing thyroid management, cardiac follow-up, oncology surveillance where cancer was missed, and management of permanent complications.
• Lost earnings during any disability.
• Lost earning capacity where cognitive, cardiac, or neurologic damage prevents return to prior employment.
• Pain and suffering for the years of untreated symptoms and any permanent sequelae.
• Loss of consortium for spouse.

Florida no longer caps non-economic damages in medical malpractice cases after North Broward Hospital District v. Kalitan, 219 So. 3d 49 (Fla. 2017).

Florida Statute § 95.11(4)(b) governs medical malpractice limitations: two years from discovery of the injury, four-year outer limit, seven years in cases of fraud or concealment. Wrongful death claims have a separate two-year statute under Florida’s Wrongful Death Act, running from the date of death. The 90-day pre-suit investigation and § 766.102 expert affidavit requirements apply.