Ketamine vial concentration used in the case is what?

• A. 50 mg/mL
• B. 100 mg/mL
• C. 150 mg/mL
• D. 200 mg/mL

Answer: (B)

The key concept here is dosing accuracy through the right concentration. Ketamine is given by calculating the dose in mg per kilogram and then converting that into a syringe volume you can inject. Using a 100 mg/mL solution (a common 10% ketamine preparation) makes this conversion straightforward and keeps the injection volume small, which improves precision and speeds up administration.

Why 100 mg/mL fits the case best: with this concentration, the required mg/kg dose translates into a manageable volume for a typical patient. The math is simple: Volume to give (in mL) = total dose (mg) divided by concentration (mg/mL). A higher concentration means you administer a smaller, more controllable volume, reducing the chance of giving too little or too much, and making rapid, smooth induction easier.

If a different concentration were used, the volume to administer would change accordingly, potentially increasing the injection volume and the risk of dosing errors, especially in smaller patients.