Diabetic Ketoacidosis DKA Criteria Calculator

Diabetic Ketoacidosis DKA Criteria Calculator for Endocrinology. A positive result requires all three components together; an isolated high glucose or lone ketonuria is not DKA. Severity bands from the consensus are: mild (pH 7.25 to 7.30 or bicarbonate 15 to 18, alert), moderate (pH 7.00 to 7.24 or bicarbonate 10 to under 15, alert/drowsy), and severe (pH below 7.00 or bicarbonate below 10, or stupor/coma). The band drives disposition and monitoring intensity, and resolution is tracked by beta-hydroxybutyrate falling below 0.6 mmol/L with pH above 7.3 and bicarbonate above 18, not by glucose normalisation alone.

How this calculator works

This tool applies the biochemical triad that defines DKA: hyperglycaemia (or a known diabetes diagnosis), ketosis, and a high-anion-gap metabolic acidosis. Under the 2024 ADA/EASD/JBDS/AACE/DTS consensus the entry glucose threshold was lowered to 11.1 mmol/L (200 mg/dL), with the explicit caveat that euglycaemic DKA (glucose below this, notably with SGLT2 inhibitors, pregnancy, or starvation) still qualifies. Ketosis is confirmed by beta-hydroxybutyrate 3.0 mmol/L or greater (preferred) or moderate-to-large ketonuria, and acidosis by venous pH below 7.3 or bicarbonate below 18 mmol/L. Severity is then graded from pH, bicarbonate, and mental status rather than from glucose.

When to use this calculator

Use this at the bedside for any patient with diabetes (type 1, type 2, or ketosis-prone) presenting with hyperglycaemia, vomiting, abdominal pain, Kussmaul breathing, or reduced consciousness, and for anyone on an SGLT2 inhibitor who is acidotic even with near-normal glucose. It is particularly valuable to confirm euglycaemic DKA, which is easily missed. Do not use it to grade hyperglycaemic hyperosmolar state (HHS), which is defined instead by glucose above 30 mmol/L, effective osmolality above 320 mOsm/kg, and minimal ketosis and acidosis; note that mixed DKA-HHS pictures occur and require both frameworks.

Inputs used

  • Glucose
  • Ketones or beta-hydroxybutyrate
  • pH
  • Bicarbonate
  • Anion gap
  • Mental status

Clinical interpretation

A positive result requires all three components together; an isolated high glucose or lone ketonuria is not DKA. Severity bands from the consensus are: mild (pH 7.25 to 7.30 or bicarbonate 15 to 18, alert), moderate (pH 7.00 to 7.24 or bicarbonate 10 to under 15, alert/drowsy), and severe (pH below 7.00 or bicarbonate below 10, or stupor/coma). The band drives disposition and monitoring intensity, and resolution is tracked by beta-hydroxybutyrate falling below 0.6 mmol/L with pH above 7.3 and bicarbonate above 18, not by glucose normalisation alone.

Worked example

A 24-year-old with type 1 diabetes presents drowsy after vomiting: glucose 26 mmol/L (468 mg/dL), capillary beta-hydroxybutyrate 5.2 mmol/L, venous pH 7.06, bicarbonate 8 mmol/L, GCS 13. All three criteria are met (glucose above 11.1, beta-hydroxybutyrate above 3.0, pH below 7.3). Because pH is below 7.00, bicarbonate below 10 mmol/L, and mental status is altered, this classifies as severe DKA, triggering fixed-rate IV insulin, aggressive fluid resuscitation, potassium replacement before/with insulin, and likely a higher-acuity (HDU/ICU) setting.

Limitations and safety notes

Blood beta-hydroxybutyrate is the correct ketone measure; urine dipsticks detect acetoacetate and can read falsely low early or falsely persistent during recovery. The high-anion-gap acidosis is not specific to DKA, so lactic acidosis, salicylate or toxic-alcohol poisoning, and uraemia must be excluded, and a concurrent normal-anion-gap or metabolic alkalosis (from vomiting) can mask the picture. The lowered 11.1 mmol/L glucose cutoff will not flag euglycaemic DKA on glucose alone, so ketones and pH must always be checked in SGLT2-inhibitor users, pregnancy, and poor oral intake. These criteria are validated in adults; paediatric DKA uses distinct thresholds and cerebral-oedema precautions.

Frequently asked questions

Does glucose have to be above 250 mg/dL to diagnose DKA?

No. The 2024 consensus lowered the threshold to 11.1 mmol/L (200 mg/dL), and euglycaemic DKA with even lower glucose still qualifies when ketosis and acidosis are present, classically with SGLT2 inhibitors, pregnancy, or fasting.

Should I use blood or urine ketones?

Blood beta-hydroxybutyrate (3.0 mmol/L or greater is diagnostic) is preferred. Urine ketones measure acetoacetate, may underestimate ketosis early, and stay positive during recovery as beta-hydroxybutyrate converts back to acetoacetate, so they should not be used to track resolution.

What separates DKA from HHS?

DKA is defined by significant ketosis and high-anion-gap acidosis (pH below 7.3, bicarbonate below 18). HHS features marked hyperglycaemia (above 30 mmol/L), effective osmolality above 320 mOsm/kg, and little or no ketoacidosis. Overlapping mixed presentations occur and need both sets of criteria.

How is DKA severity graded?

By pH, bicarbonate, and mental status, not by glucose. Severe DKA is pH below 7.00, bicarbonate below 10 mmol/L, or altered mentation, and generally warrants a monitored high-acuity bed.

When is DKA considered resolved?

When beta-hydroxybutyrate is below 0.6 mmol/L with venous pH above 7.3 and bicarbonate above 18 mmol/L. Glucose usually normalises well before the acidosis and ketosis clear, so IV insulin continues (with dextrose added) until these biochemical endpoints are met.

References

  • Umpierrez GE, Davis GM, ElSayed NA, et al. Hyperglycemic Crises in Adults With Diabetes: A Consensus Report. Diabetes Care. 2024. PMID: 39052901.
  • Umpierrez GE, Davis GM, ElSayed NA, et al. Hyperglycaemic crises in adults with diabetes: a consensus report. Diabetologia. 2024. PMID: 38907161.
  • Kitabchi AE, Umpierrez GE, Fisher JN, Murphy MB, Stentz FB. Thirty years of personal experience in hyperglycemic crises: diabetic ketoacidosis and hyperglycemic hyperosmolar state. J Clin Endocrinol Metab. 2008. PMID: 18270259.

Editorial review and citation methodology

Reviewed by the Quick Medical Calculator Editorial Team. Last reviewed: May 25, 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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