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[ MDster Editorial Team ](https://mdster.com/about) · Oct 04, 2026 · 1 min read · 55 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Board Review ](https://mdster.com/blog?tag=board-review) [ Emergency Medicine ](https://mdster.com/blog?tag=emergency-medicine) [ Internal Medicine ](https://mdster.com/blog?tag=internal-medicine) [ Diabetic Ketoacidosis ](https://mdster.com/blog?tag=diabetic-ketoacidosis) [ Type 1 Diabetes ](https://mdster.com/blog?tag=type-1-diabetes) ![Diabetic Ketoacidosis Case Discussion: Insulin, Fluids, and the Transition](https://mdster.com/storage/blog/images/diabetic-ketoacidosis-case-discussion-insulin-fluids-and-the-transition.png) Share this article Share this post On this page 1. [ Confirm DKA, Then Look Beyond It ](#confirm-dka-then-look-beyond-it) 2. [ Three biochemical findings ](#three-biochemical-findings) 3. [ What else could explain abdominal pain or drowsiness? ](#what-else-could-explain-abdominal-pain-or-drowsiness) 4. [ Replace Volume Without Losing Sight of Potassium ](#replace-volume-without-losing-sight-of-potassium) 5. [ First hour: restore perfusion ](#first-hour-restore-perfusion) 6. [ Insulin treats ketogenesis, not just glucose ](#insulin-treats-ketogenesis-not-just-glucose) 7. [ Judge the Trajectory, Not a Single Number ](#judge-the-trajectory-not-a-single-number) 8. [ Hourly bedside review ](#hourly-bedside-review) 9. [ A new headache deserves reassessment ](#a-new-headache-deserves-reassessment) 10. [ Transition Only After Biochemical Recovery ](#transition-only-after-biochemical-recovery) 11. [ Key Points for Board Exams ](#key-points-for-board-exams) 12. [ Frequently Asked Questions ](#blog-faqs) 13. [ References ](#references-heading) On this page 1. [ Confirm DKA, Then Look Beyond It ](#confirm-dka-then-look-beyond-it) 2. [ Three biochemical findings ](#three-biochemical-findings) 3. [ What else could explain abdominal pain or drowsiness? ](#what-else-could-explain-abdominal-pain-or-drowsiness) 4. [ Replace Volume Without Losing Sight of Potassium ](#replace-volume-without-losing-sight-of-potassium) 5. [ First hour: restore perfusion ](#first-hour-restore-perfusion) 6. [ Insulin treats ketogenesis, not just glucose ](#insulin-treats-ketogenesis-not-just-glucose) 7. [ Judge the Trajectory, Not a Single Number ](#judge-the-trajectory-not-a-single-number) 8. [ Hourly bedside review ](#hourly-bedside-review) 9. [ A new headache deserves reassessment ](#a-new-headache-deserves-reassessment) 10. [ Transition Only After Biochemical Recovery ](#transition-only-after-biochemical-recovery) 11. [ Key Points for Board Exams ](#key-points-for-board-exams) 12. [ Frequently Asked Questions ](#blog-faqs) 13. [ References ](#references-heading) A 23-year-old woman with type 1 diabetes arrives lethargic after two days of vomiting and missed insulin. Her glucose is 27 mmol/L, blood ketones 4.5 mmol/L, venous pH 7.12, and bicarbonate 12 mmol/L. Kussmaul respirations signal substantial acid production; fever and a nitrite-positive urine dip raise concern for a concurrent urinary infection. Confirm DKA, Then Look Beyond It -------------------------------- ### Three biochemical findings She has diabetes with hyperglycemia, significant ketonemia, and metabolic acidosis: the three diagnostic components of DKA. The 2024 international consensus, reflected in the ADA’s 2026 hospital standards, uses glucose ≥11.1 mmol/L **or known diabetes**, β-hydroxybutyrate ≥3.0 mmol/L or urine ketones ≥2+, and pH <7.3 and/or bicarbonate <18 mmol/L. The JBDS pathway uses a narrower bicarbonate threshold of <15 mmol/L; this patient meets either definition. [\[1\]](#cite-1 "Reference [1]") Insulin deficiency and counterregulatory hormones drive lipolysis and ketogenesis. Meanwhile, glycosuria, vomiting, and reduced intake deplete water and electrolytes. A serum potassium of 4.5 mmol/L therefore offers **no reassurance about total-body potassium**: insulin treatment can reveal the deficit rapidly. [\[2\]](#cite-2 "Reference [2]") ### What else could explain abdominal pain or drowsiness? - **Urinary infection or sepsis:** investigate as a precipitant, but do not treat a dipstick as proof of the source. - **Pancreatitis or an acute abdomen:** reassess if pain remains focal or persists as acidosis improves. - **HHS or mixed DKA–HHS:** consider when hyperosmolality or altered consciousness appears disproportionate; marked ketonemia and acidosis establish DKA here. - **Pregnancy:** test when relevant; it changes the differential and warrants specialist input. Obtain electrolytes, renal function, venous gas, quantitative ketones, ECG, and pregnancy testing where appropriate. Send urine culture and other infection investigations guided by examination; assess for sepsis and start antimicrobials when clinically indicated. Record mental status, perfusion, and urine output while treatment begins. [\[2\]](#cite-2 "Reference [2]") Replace Volume Without Losing Sight of Potassium ------------------------------------------------ ### First hour: restore perfusion With systolic BP 100 mmHg and no stated cardiac or renal failure, a JBDS-based prescription is **1 L of 0.9% sodium chloride over the first hour**. The international consensus also permits an isotonic balanced crystalloid and recommends an initial 500–1,000 mL/h in adults without cardiac or renal compromise. Reassess blood pressure, heart rate, sodium, urine output, and fluid balance before continuing; JBDS specifically advises more cautious replacement in people aged 18–25 years. [\[2\]](#cite-2 "Reference [2]") After that liter, potassium has fallen to 3.9 mmol/L. If she is passing urine and renal function remains adequate, the JBDS regimen calls for a **premixed bag containing 40 mmol KCl per liter** of 0.9% saline, with the next liter generally given over two hours. Do not add potassium when it is >5.5 mmol/L under that pathway; a value <3.5 mmol/L requires urgent review and correction before insulin is continued or started. Local infusion safeguards govern administration. [\[3\]](#cite-3 "Reference [3]") ### Insulin treats ketogenesis, not just glucose A fixed-rate IV insulin infusion at 0.1 units/kg/h is **6.5 units/h** for this 65-kg patient. Check potassium before initiation; do not give a routine insulin bolus under the JBDS pathway. If she normally uses long-acting basal insulin, continue it at its scheduled dose unless an individualized clinical reason prevents this. [\[2\]](#cite-2 "Reference [2]") > **Clinical pearl:** Glucose can normalize hours before ketoacidosis resolves. Add dextrose to permit continued insulin; stopping insulin because glucose looks better invites recurrent ketogenesis. [\[2\]](#cite-2 "Reference [2]") Judge the Trajectory, Not a Single Number ----------------------------------------- ### Hourly bedside review JBDS treatment targets are a fall in blood ketones of at least 0.5 mmol/L/h **or** a bicarbonate rise of at least 3 mmol/L/h, alongside a glucose fall of at least 3 mmol/L/h. These are response targets, not criteria for declaring resolution. If progress stalls, inspect the insulin prescription, pump, line, fluid delivery, and precipitant before escalating treatment. [\[3\]](#cite-3 "Reference [3]") - Check bedside glucose and ketones hourly when using the JBDS pathway. - Repeat venous pH, bicarbonate, and potassium at one and two hours, then approximately every two hours; check potassium more often if outside the target range. - Follow vital signs, neurologic status, fluid balance, and urine output. The international consensus allows different laboratory intervals, so use the monitored local protocol. [\[3\]](#cite-3 "Reference [3]") At six hours, glucose is 13.5 mmol/L, but ketones remain 2.1 mmol/L and pH 7.28. **DKA has not resolved.** Add dextrose while continuing electrolyte-containing resuscitation as clinically needed. JBDS specifies 10% glucose at 125 mL/h once glucose falls below 14 mmol/L and suggests considering an insulin reduction to 0.05 units/kg/h; the international consensus recommends 5–10% dextrose and reduction to 0.05 units/kg/h below 13.9 mmol/L. For her, that reduced rate is 3.25 units/h if selected under protocol. [\[3\]](#cite-3 "Reference [3]") ### A new headache deserves reassessment Ask whether the headache is worsening and repeat the neurologic examination. New confusion, deteriorating consciousness, seizures, or focal findings warrant urgent senior and critical-care assessment; do not dismiss deterioration as an expected feature of DKA treatment. [\[2\]](#cite-2 "Reference [2]") At pH 7.12, **do not give routine bicarbonate**. The international consensus finds no demonstrated routine benefit and notes potential hypokalemia, paradoxical CNS acidosis, and cerebral edema; it considers bicarbonate only for severe acidosis with pH <7.0. Those potential harms do not establish that bicarbonate caused this patient’s headache. [\[4\]](#cite-4 "Reference [4]") Transition Only After Biochemical Recovery ------------------------------------------ At 18 hours, she is eating, with ketones 0.4 mmol/L and pH 7.38. These meet the consensus resolution criteria of ketones <0.6 mmol/L plus pH ≥7.3 or bicarbonate ≥18 mmol/L. Do not use glucose alone—or persistent urine ketones—to decide whether the infusion can stop. [\[2\]](#cite-2 "Reference [2]") Confirm that basal insulin is prescribed, give mealtime subcutaneous insulin with food, and **overlap IV and subcutaneous insulin**. The international consensus recommends starting the basal–bolus regimen 1–2 hours before stopping IV insulin; JBDS specifies continuing the infusion for 30–60 minutes after the first fast-acting mealtime injection when basal coverage is already in place. Follow one coherent local transition protocol rather than mixing its timings. Before discharge, address infection, insulin access, and a sick-day plan that explicitly avoids omitting basal insulin during vomiting. [\[2\]](#cite-2 "Reference [2]") Key Points for Board Exams -------------------------- - Diagnose DKA from diabetes or hyperglycemia, ketosis, **and** acidosis; thresholds differ slightly between major pathways. - A normal presenting potassium can conceal profound depletion. Recheck it as fluids and insulin take effect. - When glucose falls before ketones clear, add dextrose and continue appropriately adjusted insulin. - Resolve the biochemical crisis and ensure basal coverage before ending the IV infusion. [\[2\]](#cite-2 "Reference [2]") The decisive clinical question is not whether her glucose has improved, but whether ketogenesis has stopped without trading DKA for hypoglycemia or hypokalemia. Frequently Asked Questions ---------------------------- ### Why did potassium fall from 4.5 to 3.9 mmol/L after treatment began? DKA causes total-body potassium loss even when the initial serum value is normal. Rehydration and insulin can lower the measured concentration further. [\[2\]](#cite-2 "Reference [2]") ### Should IV insulin stop when glucose reaches 13.5 mmol/L? No. With ketones at 2.1 mmol/L and pH 7.28, add dextrose and continue insulin at a protocol-adjusted rate until ketoacidosis resolves. [\[3\]](#cite-3 "Reference [3]") ### When is bicarbonate considered in adult DKA? It is not routine. The international consensus suggests considering it only for severe acidosis with pH <7.0, while accounting for potential harms. [\[4\]](#cite-4 "Reference [4]") ### How should IV insulin be stopped after DKA resolves? Ensure basal insulin coverage and an appropriate subcutaneous regimen, then overlap the injections with IV insulin according to the local transition protocol. [\[2\]](#cite-2 "Reference [2]") References (5) ------------------ 1. 1. [ doi.org/10.2337/dc26-s016 ](https://doi.org/10.2337/dc26-s016) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ Umpierrez GE, et al. Hyperglycemic Crises in Adults With Diabetes: A Consensus Report. Diabetes Care. 2024. ](https://pmc.ncbi.nlm.nih.gov/articles/PMC11272983/) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ Joint British Diabetes Societies for Inpatient Care. The Management of Diabetic Ketoacidosis in Adults. January 2023. ](https://www.diabetes.org.uk/sites/default/files/2023-03/JBDS%2002%20DKA%20Guideline%20with%20qr%20code.pdf) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ pmc.ncbi.nlm.nih.gov/articles/PMC11343900 ](https://pmc.ncbi.nlm.nih.gov/articles/PMC11343900/) [↩](#cite-ref-4-1 "Back to text") 5. 5. [ American Diabetes Association Professional Practice Committee. Diabetes Care in the Hospital: Standards of Care in Diabetes—2026. 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