Endocrine & metabolic · UKMLA & AKT

Hyperosmolar hyperglycaemic state (HHS)

A free high-yield preview for the UKMLA Applied Knowledge Test. Below are the key points to recognise hyperosmolar hyperglycaemic state (hhs) — the full SA Note notes add investigations, management, complications and 10 practice questions.

Key high-yield points

  • Blood glucose >30 mmol/L
  • Serum osmolality >320 mOsm/kg - formula: 2(Na + K) + glucose + urea
  • Serum bicarbonate >15 mmol/L and/or pH >7.3 (no significant acidosis)
  • Ketones absent or minimal (<3 mmol/L; urine ketones ≤2+)
  • Typically type 2 diabetes; may be first presentation in up to 25% of cases

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