In DKA and HHS, sodium levels can vary. Which statement is true?

In DKA and HHS, sodium levels can vary. Which statement is true?

• A. Always low.
• B. Always high.
• C. Sodium levels are normal in both.
• D. Sodium levels can be low or high in both DKA and HHS.

Answer: (D)

Sodium status in DKA and HHS is not fixed because both conditions involve extreme hyperglycemia and significant fluid shifts. The high glucose pulls water from inside cells into the extracellular space, diluting serum sodium and often producing a low measured sodium (dilutional hyponatremia). At the same time, osmotic diuresis and poor intake can cause true sodium losses, and in patients with substantial dehydration (especially in HHS), the serum sodium can become normal or even elevated (hypernatremia). Because the amount of dilution depends on how high the glucose is and how much free water a patient has, sodium can be low or high in either DKA or HHS. To assess true sodium status, clinicians often correct the measured sodium for hyperglycemia (roughly adding about 1.6 mEq/L to Na for every 100 mg/dL glucose above 100 mg/dL). This helps explain why the statement that sodium levels can be low or high in both conditions is the accurate one.

Sodium status in DKA and HHS is not fixed because both conditions involve extreme hyperglycemia and significant fluid shifts. The high glucose pulls water from inside cells into the extracellular space, diluting serum sodium and often producing a low measured sodium (dilutional hyponatremia). At the same time, osmotic diuresis and poor intake can cause true sodium losses, and in patients with substantial dehydration (especially in HHS), the serum sodium can become normal or even elevated (hypernatremia). Because the amount of dilution depends on how high the glucose is and how much free water a patient has, sodium can be low or high in either DKA or HHS. To assess true sodium status, clinicians often correct the measured sodium for hyperglycemia (roughly adding about 1.6 mEq/L to Na for every 100 mg/dL glucose above 100 mg/dL). This helps explain why the statement that sodium levels can be low or high in both conditions is the accurate one.