Burch-Wartofsky Point Scale (BWPS) for Thyrotoxicosis Calculator

Burch-Wartofsky Point Scale (BWPS) for Thyrotoxicosis Calculator for Endocrinology. Scores stratify into three bands: below 25 makes storm unlikely, 25 to 44 is compatible with impending storm and warrants close monitoring and a low threshold to treat, and 45 or higher is highly suggestive of established thyroid storm. The bands are deliberately sensitive, not a strict cutoff: a patient at 40 to 44 with a strong precipitant is often treated as impending storm. The score's clinical value is that it forces treatment decisions on the syndrome's severity (fever, delirium, cardiovascular collapse, hepatic dysfunction) rather than on hormone levels, which overlap heavily between storm and uncomplicated thyrotoxicosis.

How this calculator works

The BWPS is an empirically weighted, additive clinical score that quantifies how far a thyrotoxic patient has progressed toward decompensated thyroid storm, without relying on any specific thyroid hormone threshold (free T4/T3 do not enter the score). Points are assigned across graded severity tiers within six domains: thermoregulatory dysfunction (temperature, up to 30 points), central nervous system effects (agitation through seizure/coma, up to 30), gastrointestinal-hepatic dysfunction including unexplained jaundice (up to 20), cardiovascular tachycardia (up to 25), congestive heart failure (up to 15), and atrial fibrillation (10), plus a 10-point item for a precipitating event. The weighted sums are added, so a single severe domain (e.g. temperature above 40 degrees C or coma) can move a patient across a decision band on its own.

When to use this calculator

Apply the BWPS at the bedside in any thyrotoxic patient who looks systemically unwell, particularly Graves or toxic nodular disease decompensating after an infection, surgery, trauma, radioiodine, iodinated contrast, or antithyroid-drug withdrawal. It is designed for adult acute-care and ICU settings to decide whether to escalate to aggressive multimodal therapy before biochemical confirmation returns. It is not a screening test for uncomplicated hyperthyroidism, was not validated in children or pregnancy, and should not be used to exclude storm in an obtunded patient where history is unavailable.

Inputs used

  • Temperature
  • CNS effects
  • GI-hepatic symptoms
  • Heart rate
  • Atrial fibrillation
  • Heart failure
  • Precipitating event

Clinical interpretation

Scores stratify into three bands: below 25 makes storm unlikely, 25 to 44 is compatible with impending storm and warrants close monitoring and a low threshold to treat, and 45 or higher is highly suggestive of established thyroid storm. The bands are deliberately sensitive, not a strict cutoff: a patient at 40 to 44 with a strong precipitant is often treated as impending storm. The score's clinical value is that it forces treatment decisions on the syndrome's severity (fever, delirium, cardiovascular collapse, hepatic dysfunction) rather than on hormone levels, which overlap heavily between storm and uncomplicated thyrotoxicosis.

Worked example

A 58-year-old with untreated Graves presents 3 days after a hip fracture with temperature 39.4 degrees C (20), marked agitation (20), diarrhoea and vomiting (10), heart rate 138 (20), no heart failure signs (0), atrial fibrillation (10), and a clear precipitant (10). Total = 90 points. Because this is well above 45, the presentation is highly suggestive of thyroid storm, and empiric therapy (beta-blockade, thionamide, iodine given after the thionamide, glucocorticoid, cooling, treat the precipitant) should begin immediately rather than awaiting free T4/T3.

Limitations and safety notes

The scale was derived from expert consensus and a small case series, never prospectively validated against a gold standard, and several items (agitation, "unexplained" jaundice) are subjective and inflate scores in patients with sepsis, delirium, or liver disease from other causes. It over-diagnoses relative to the more specific Japan Thyroid Association criteria, which require documented thyrotoxicosis plus defined organ-system combinations; head-to-head data show many BWPS-positive patients do not meet JTA criteria. Point weights are ordinal and not mortality-calibrated, so a score does not translate into a numeric death risk, and the atrial fibrillation and CHF items double-count in patients with pre-existing cardiac disease.

Frequently asked questions

Does the BWPS use thyroid hormone levels?

No. The score is entirely clinical; free T4, free T3, and TSH are not scored. This is intentional, because hormone concentrations overlap substantially between uncomplicated thyrotoxicosis and thyroid storm and do not distinguish them. Biochemistry confirms thyrotoxicosis and guides the diagnosis but does not change the point total.

How does the BWPS compare with the Japanese Thyroid Association (Akamizu) criteria?

The JTA criteria are categorical and more specific, requiring proven thyrotoxicosis plus defined combinations of CNS, fever, tachycardia, heart failure, and GI/hepatic features. The BWPS is more sensitive but less specific, so a score of 45 or higher does not always satisfy JTA criteria. Many clinicians use BWPS to trigger early treatment and JTA criteria to characterise confirmed cases.

Should I wait for a score of 45 before treating?

No. The 25 to 44 band is explicitly the impending-storm range, and treatment should not be withheld from a deteriorating patient with a strong precipitant just because they fall short of 45. The bands guide urgency; clinical trajectory and the presence of a precipitant matter as much as the exact number.

Can the BWPS give a false-positive result?

Yes. Fever, tachycardia, agitation, and jaundice from sepsis, delirium tremens, or non-thyroidal liver disease can drive the score up in a thyrotoxic patient who is not actually in storm. Thyrotoxicosis must be present and confirmed, and competing explanations for each domain should be weighed before attributing the whole picture to storm.

References

  • Burch HB, Wartofsky L. Life-threatening thyrotoxicosis. Thyroid storm. Endocrinol Metab Clin North Am. 1993. PMID: 8325286.
  • Akamizu T, Satoh T, Isozaki O, et al. Diagnostic criteria, clinical features, and incidence of thyroid storm based on nationwide surveys. Thyroid. 2012. PMID: 22690898.
  • Ross DS, Burch HB, Cooper DS, et al. 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis. Thyroid. 2016. PMID: 27521067.

Editorial review and citation methodology

Reviewed by the Quick Medical Calculator Editorial Team. Last reviewed: May 23, 2026. The review checks calculator inputs, intended population, interpretation, limitations, and source alignment.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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