Osmolarity Calculator

How to Use the Osmolarity Calculator

This guide will walk you through the process of using the Osmolarity Calculator. The purpose of this calculator is to determine the calculated serum osmolarity and the osmolar gap based on specific blood parameter inputs.

Step 1: Input Sodium Level

Begin by locating the input field labeled Sodium (Na⁺) Level (mEq/L). Enter the patient’s sodium level, ensuring it falls within the permissible range of 100 to 200 mEq/L. The step for input increments is 0.1, meaning you should enter your value accordingly to the decimal.

Step 2: Input Potassium Level

Next, move on to the field labeled Potassium (K⁺) Level (mEq/L). Here, you must input the potassium level present in the patient’s blood. The value should be between 1 and 10 mEq/L, with increments in steps of 0.1.

Step 3: Enter Blood Urea Nitrogen (BUN)

Proceed to the Blood Urea Nitrogen (BUN) (mg/dL) field and enter the relevant BUN value. It is important to maintain this value within the range of 0 to 200 mg/dL, and it should follow the 0.1 step increment rule.

Step 4: Enter Glucose Level

Finally, fill in the Glucose Level (mg/dL) field with the patient’s glucose reading. This input should be between 0 and 1000 mg/dL, utilizing the step increment of 0.1.

Step 5: Review Results

Once all input fields are populated with valid data, the calculator will automatically compute the results. Review the following calculated values:

• Calculated Serum Osmolarity: This value is computed using the formula: (2 * sodiumLevel) + (2 * potassiumLevel) + (glucoseLevel / 18) + (bloodUreaNitrogen / 2.8). The resulting figure is expressed in mOsm/L and displayed to one decimal place.
• Osmolar Gap: The osmolar gap is determined by subtracting 290 from the calculated serum osmolarity. This value is similarly expressed in mOsm/L with one decimal precision.

Congratulations! You have successfully used the Osmolarity Calculator to derive both the calculated serum osmolarity and the osmolar gap based on provided blood parameter levels. Revisit each input field and ensure your values are within the allowed ranges if the result does not appear correct.