Dosage Practice

ATI Dosage Calculation Practice: The Proctored Exam and the Modules

ATI's dosage calculation content runs from basic conversions to safe dose ranges and IV calculations, with fill-in-the-blank numeric answers and strict rounding. The proctored assessment is pass or fail at a mark your program sets, often 90% or 100%.

How to prepare

  1. 1 Work through the topics in order: conversions, oral doses, injections, weight-based doses, safe dose ranges, IV rates. Each builds on the last.
  2. 2 Treat every question as exact. Partial credit does not exist.
  3. 3 Practice the safe-dose-range format in particular: find the low and high boundaries, then compare the order on the same per-dose or per-day basis.
  4. 4 Time yourself. The proctored exam is long enough that slow arithmetic costs marks at the end.

Worked Examples

Example 1

Recommended: 10 to 20 mg/kg/day. Child weighs 15 kg. Ordered: 100 mg every 8 hours. Safe?

  1. Range: 150 to 300 mg/day.
  2. Ordered: 100 × 3 = 300 mg/day.
  3. 300 is within range.

Answer: Safe

Example 2

Ordered: 250 mg by mouth. Available: 125 mg per 5 mL. How many mL?

  1. 250 ÷ 125 × 5 = 10 mL.

Answer: 10 mL

Try five free problems

One exact answer, rounded as asked, no partial credit. No sign-up needed.

Problem 1 of 5No sign-up needed

A child weighs 86 lb. What is the weight in kg?

round to the nearest tenth

kg

Common Mistakes

  • Comparing a single dose with a daily range

    Put the order and the range on the same basis before comparing. Three doses of 100 mg is 300 mg a day.

  • Rounding too early

    Carry the full number through and round once at the end, to the place the question names.

  • Trailing zeros

    Type 5, not 5.0. The grading treats 5.0 as wrong because the real world treats it as dangerous.

Questions Students Ask

What rounding does ATI expect?

The same conventions as the textbooks: tenths for mL and kg, hundredths for small syringe volumes, whole numbers for drops per minute and most pump rates. The question states the rule.

Is this site affiliated with ATI?

No. ATI is a registered trademark of Assessment Technologies Institute. We teach the underlying math and are not connected with the company.

Practice until it feels easy

Work through the lessons with fresh numbers every time. The practice round and the first five problems of lesson 1 are free.

See all lessons