# An adult with DKA is being treated with IV fluids, insulin drip, and electrolyte replacement. Review the recovery trend across 6 hours and answer the questions.

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> language: en  
> subject: Laboratory Values  
> category: ROR

## Question

An adult with DKA is being treated with IV fluids, insulin drip, and electrolyte replacement. Review the recovery trend across 6 hours and answer the questions.

| Time | Data |
| --- | --- |
| 0 hours | glucose: 450 mg/dL; anion gap: 22 mEq/L; pH: 7.22; bicarbonate: 12 mEq/L; potassium: 5.2 mEq/L |
| 2 hours | glucose: 380 mg/dL; anion gap: 19 mEq/L; pH: 7.26; bicarbonate: 14 mEq/L; potassium: 4.8 mEq/L |
| 4 hours | glucose: 290 mg/dL; anion gap: 16 mEq/L; pH: 7.30; bicarbonate: 16 mEq/L; potassium: 4.2 mEq/L |
| 6 hours | glucose: 210 mg/dL; anion gap: 14 mEq/L; pH: 7.33; bicarbonate: 17 mEq/L; potassium: 4.0 mEq/L |

Q1. Which interpretation of the 6-hour trend is most accurate?

DKA is worsening; pH and bicarbonate remain low despite glucose improvement.
DKA is stable but unchanged; metabolic acidosis persists without significant improvement.
DKA is resolving completely; all criteria for resolution are met.
DKA is resolving; anion gap is closing but pH and bicarbonate are not yet fully normalized.

Q2. At 6 hours, the glucose is 210 mg/dL and the anion gap is 14 mEq/L. What is the priority action?

Switch directly to subcutaneous insulin without overlap.
Increase the insulin drip rate to clear glucose faster.
Add dextrose to IV fluids and continue insulin drip at current rate.
Stop the insulin drip immediately to prevent hypoglycemia.

Q3. Which parameter is the best indicator that the insulin drip can be safely discontinued?

Bicarbonate >18 mEq/L
Anion gap <12 mEq/L
Glucose <200 mg/dL
pH >7.30

## Explanation

The trend shows steady DKA resolution: glucose falling, anion gap closing, pH and bicarbonate normalizing, potassium maintained with replacement. The priority action when GLUCOSE reaches 200-250 is to ADD DEXTROSE to the IV fluids while CONTINUING THE INSULIN DRIP to keep clearing ketones and closing the anion gap. Stopping insulin too early (before AG closes) reopens the acidosis. Potassium replacement continues with insulin until DKA is resolved.

## In-depth explanation

Quick answer
The trend demonstrates progressive DKA resolution with glucose declining, anion gap narrowing, and pH/bicarbonate improving. At 6 hours, glucose is 210 mg/dL and anion gap is 14 mEq/L (still elevated). The correct action is to add dextrose to IV fluids while continuing the insulin drip to prevent hypoglycemia and allow continued ketone clearance.

Why this is correct
In DKA management, when glucose falls below 250 mg/dL, dextrose should be added to IV fluids to prevent hypoglycemia while insulin is continued until the anion gap closes. Stopping insulin prematurely would halt ketone suppression and worsen acidosis.

Clinical picture
The anion gap remains elevated at 14 mEq/L (normal 8-12), indicating ongoing ketonemia. Insulin is required to close the gap; dextrose provides substrate to prevent hypoglycemia during continued insulin infusion.

Memory hook
DKA resolution criteria: glucose <200 mg/dL, anion gap <12 mEq/L, bicarbonate ≥18 mEq/L, pH >7.30. Add dextrose when glucose <250 mg/dL while continuing insulin until anion gap closes.

NCLEX decision rule
Never stop insulin before the anion gap closes. Add dextrose when glucose approaches 200-250 mg/dL to prevent hypoglycemia.

Why the alternatives are wrong
Stopping the insulin drip would allow ketone production to resume. Switching to subcutaneous insulin without overlap risks rebound hyperglycemia and ketosis. Increasing insulin rate would accelerate glucose drop and cause hypoglycemia.

Sources
1NCSBN 2026 NCLEX-RN Test Plan
2ADA Consensus Report on Hyperglycemic Crises

## Clinical scenario

**Adult with DKA** on **IV fluids, insulin drip 0.1 unit/kg/hour, and electrolyte replacement**. The nurse evaluates the trend across the first 6 hours of treatment.

## Key concepts

- **Anion gap** — Calculated as Na - (Cl + HCO3). Normal 8-12 mEq/L. Elevated in DKA due to ketoacids. Closing gap indicates resolution.
- **DKA resolution criteria** — Glucose <200 mg/dL, anion gap <12 mEq/L, bicarbonate ≥18 mEq/L, pH >7.30. Insulin should continue until these are met.
- **Insulin drip transition** — When DKA resolves, overlap subcutaneous insulin with IV insulin for 1-2 hours to prevent rebound hyperglycemia.

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