How many milliliters are needed to administer 2.4 grams if 2.5 grams is equivalent to 25 milliliters?

Dosage Calculation

To administer 2.4 grams when the concentration is 2.5 grams per 25 mL, you need to give 24 mL.

Calculation Method

This is a straightforward proportion calculation using the ratio-proportion method:

• Given concentration: 2.5 g = 25 mL
• Desired dose: 2.4 g = X mL

Formula:

• (2.4 g ÷ 2.5 g) × 25 mL = 24 mL

Step-by-step:

• First, determine the concentration: 2.5 g/25 mL = 0.1 g/mL (or 100 mg/mL)
• Then calculate volume needed: 2.4 g ÷ 0.1 g/mL = 24 mL

Clinical Application

When preparing medications for administration, always verify:

• The concentration of the medication solution available
• The prescribed dose in weight (grams, milligrams)
• The calculated volume to be administered
• Double-check calculations before administration, particularly with high-risk medications

This calculation applies to any medication where you know the concentration and need to determine the volume to administer for a specific dose.