Sodium Change Calculator in Hypertriglyceridemia

Extreme hypertriglyceridemia expands the non-aqueous plasma fraction, displacing plasma water and leading to an underestimation of serum sodium when measured by certain laboratory techniques like flame photometry. To correct this measurement, our calculator applies two straightforward equations. First, it determines the expected sodium change based on the triglyceride concentration: Sodium Change = Triglycerides × 0.002. Second, it adds this adjustment to the measured sodium value to find the true physiological concentration: Corrected Sodium = Measured Sodium + Sodium Change.

Imagine a patient presents with severe hypertriglyceridemia, registering a triglyceride level of 2,500 mg/dL. During routine blood work, their measured serum sodium comes back at 128 mEq/L. To find the true sodium concentration, we first calculate the sodium change by multiplying the triglycerides by the correction factor: 2,500 × 0.002 = 5 mEq/L. Next, we add this adjustment to the measured sodium: 128 + 5 = 133 mEq/L. Therefore, the corrected sodium level is 133 mEq/L, revealing a milder electrolyte imbalance than the initial lab report suggested.

Always verify the laboratory method used for sodium quantification, as direct ion-selective electrodes are generally immune to hyperlipidemia interference. Ensure that triglyceride and sodium panels are drawn from the same blood sample under consistent conditions to avoid clinical discrepancies. Remember that this tool provides an estimated correction and should always be interpreted within the full clinical context of the patient's overall metabolic panel.