How is serum osmolality calculated in HHS?

Calculated osmolality = 2 × Na + glucose/18 + BUN/2.8; normal 275-295 mOsm/kg; HHS diagnosis requires osmolality >320 mOsm/kg with glucose >600 mg/dL and no significant ketoacidosis; altered consciousness typically occurs >340 mOsm/kg.

How should corrected sodium be interpreted in HHS?

Corrected Na = measured Na + 1.6 × (glucose - 100) / 100; or + 2.4 if glucose >400 mg/dL; hyponatremia with very high glucose may be pseudohyponatremia; true hypernatremia requires free water deficit correction.

What is the fluid resuscitation strategy in HHS vs DKA?

HHS requires more aggressive initial rehydration (average 8-12L deficit vs 5-6L in DKA); 0.9% NS at 1L/h for 1-2h, then 0.45% NS at 250-500 mL/h; reduce plasma osmolality slowly (≤3-4 mOsm/kg/h) to avoid cerebral edema.

When should insulin be started in HHS?

Insulin withheld until adequate fluid resuscitation (glucose may fall without insulin initially from dilution); begin insulin at 0.05-0.1 units/kg/h when patient has received 2-4L IV fluids; do not start insulin with glucose <250 mg/dL without dextrose co-infusion.

What potassium replacement is required in HHS?

Initial K+ often high from transcellular shift; start K replacement when K <5.5 mEq/L and adequate urine output; target K 4.0-5.0 mEq/L; IV potassium 20-40 mEq/h if K <3.5 mEq/L; delay insulin if K <3.3 mEq/L.

Hyperosmolar Hyperglycemic State (HHS) Fluid and Insulin Protocol

Calculates free water deficit, osmolality, and insulin/potassium replacement protocol for hyperosmolar hyperglycemic state (HHS) using glucose, sodium, BUN, and osmolality measurements.

Weight

Height

Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How It Works

Calculates free water deficit, osmolality, and insulin/potassium replacement protocol for hyperosmolar hyperglycemic state (HHS) using glucose, sodium, BUN, and osmolality measurements

Each component has a specific meaning:

Glucose — The glucose recorded for the patient or scenario being assessed.
Sodium — The sodium recorded for the patient or scenario being assessed.
BUN — The bun recorded for the patient or scenario being assessed.
Osmolality measurements — The osmolality measurements recorded for the patient or scenario being assessed.

Note: Interpret the hhs protocol result against the clinical thresholds and context described above.

How to Use

Enter the glucose, sodium, BUN, osmolality measurements for the patient or scenario you are assessing. Calculates free water deficit, osmolality, and insulin/potassium replacement protocol for hyperosmolar hyperglycemic state (HHS) using glucose, sodium, BUN, and osmolality measurements. Use the hhs protocol result to inform your clinical assessment.

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