ATI Pharmacology CMS Practice Exam – Form B
(2026/2027) | NCLEX-RN Predictor |
Mastery-Focused Rationales
CATEGORY 1 – SAFETY & ADMINISTRATION (18 Qs)
Q1
A nurse is preparing to give regular insulin 6 units and NPH insulin 17 units
subcutaneously at 0730. Which action should the nurse take FIRST?
A. Inject 17 units of air into the NPH vial.
B. Verify both insulin doses with a second nurse.
C. Check the client’s most recent blood glucose result.
D. Roll the NPH vial between the palms to mix.
ATI Mastery Rationale
Correct Answer: C
Nursing Principle: Assessment Before High-Alert Medication Administration
Step-by-Step Analysis
Step 1 – Key cue: Two insulins scheduled (high-alert).
,Step 2 – Primary concern: Prevent hypoglycemia; dose safety depends on current
glucose.
Step 3 – Correct action: Obtain latest glucose; if <70 mg/dL the dose may need to be
held or reduced.
Why the Distractors are Incorrect
A & D are preparation steps that occur AFTER safety assessment.
B is mandatory but is performed immediately BEFORE injection, not first in the overall
sequence.
NCLEX Tip: When an “assess” option appears before giving insulin, it is usually the
priority.
Q2
A 22-kg child is prescribed vancomycin 330 mg IV q8h. The safe range is 40–60
mg/kg/day. Which action should the nurse take BEFORE giving the first dose?
A. Give the dose and monitor for red-man syndrome.
B. Hold the dose and contact the prescriber.
C. Divide the daily amount into three equal doses.
D. Dilute in 50 mL NS and infuse over 30 min.
ATI Mastery Rationale
Correct Answer: B
Nursing Principle: Verify Dose Falls Within Safe Daily Range Before Administration
,Step-by-Step Analysis
Step 1 – Key cue: 22 kg × 60 mg/kg/day = 1,320 mg/day max; ordered 330 mg × 3 = 990
mg/day → within range.
Step 2 – Wait: 330 mg q8h = 990 mg/day; 990 ÷ 22 = 45 mg/kg/day → SAFE.
Step 3 – But 330 mg q8h is 15 mg/kg/dose; recommended initial dosing is 10–15
mg/kg/dose. Dose is at upper limit—confirm with prescriber to avoid early
nephrotoxicity.
Why the Others are Incorrect
A assumes dose is safe without verification.
C is already ordered correctly.
D describes administration, not dose safety.
NCLEX Tip: Do the math first; if dose equals the exact upper limit, confirm—never
assume.
Q3
A client has an order for heparin 5,000 units IV push now. The vial reads 10,000
units/mL. Which action demonstrates best practice?
A. Withdraw 0.5 mL and administer without dilution.
B. Dilute 0.5 mL in 9.5 mL NS to equal 500 units/mL, then give 10 mL.
C. Ask a second nurse to observe waste and verify the 0.5 mL dose.
D. Use a 3-mL syringe with a 25-gauge ⅝-inch needle.
, ATI Mastery Rationale
Correct Answer: C
Nursing Principle: Independent Double-Check for High-Alert Anticoagulant
Step-by-Step Analysis
Step 1 – Key cue: High-alert medication with narrow therapeutic index.
Step 2 – Primary concern: Prevent overdose or underdose.
Step 3 – Correct action: Second nurse independently verifies dose volume (0.5 mL) and
witnesses waste.
Why the Others are Incorrect
A omits the required double-check.
B creates unnecessary volume and increases error risk.
D uses wrong needle length for IV push.
NCLEX Tip: For heparin and insulin, “independent double-check” is testable on every
exam.
Q4
A nurse is reconstituting cefazolin 500 mg IM. The 1-g vial label states: “Add 2.5 mL
sterile water = 330 mg/mL.” Which technique is correct?
A. Use 2.5 mL diluent, then withdraw 1.5 mL.
B. Use 3 mL diluent, then withdraw 1.2 mL.
(2026/2027) | NCLEX-RN Predictor |
Mastery-Focused Rationales
CATEGORY 1 – SAFETY & ADMINISTRATION (18 Qs)
Q1
A nurse is preparing to give regular insulin 6 units and NPH insulin 17 units
subcutaneously at 0730. Which action should the nurse take FIRST?
A. Inject 17 units of air into the NPH vial.
B. Verify both insulin doses with a second nurse.
C. Check the client’s most recent blood glucose result.
D. Roll the NPH vial between the palms to mix.
ATI Mastery Rationale
Correct Answer: C
Nursing Principle: Assessment Before High-Alert Medication Administration
Step-by-Step Analysis
Step 1 – Key cue: Two insulins scheduled (high-alert).
,Step 2 – Primary concern: Prevent hypoglycemia; dose safety depends on current
glucose.
Step 3 – Correct action: Obtain latest glucose; if <70 mg/dL the dose may need to be
held or reduced.
Why the Distractors are Incorrect
A & D are preparation steps that occur AFTER safety assessment.
B is mandatory but is performed immediately BEFORE injection, not first in the overall
sequence.
NCLEX Tip: When an “assess” option appears before giving insulin, it is usually the
priority.
Q2
A 22-kg child is prescribed vancomycin 330 mg IV q8h. The safe range is 40–60
mg/kg/day. Which action should the nurse take BEFORE giving the first dose?
A. Give the dose and monitor for red-man syndrome.
B. Hold the dose and contact the prescriber.
C. Divide the daily amount into three equal doses.
D. Dilute in 50 mL NS and infuse over 30 min.
ATI Mastery Rationale
Correct Answer: B
Nursing Principle: Verify Dose Falls Within Safe Daily Range Before Administration
,Step-by-Step Analysis
Step 1 – Key cue: 22 kg × 60 mg/kg/day = 1,320 mg/day max; ordered 330 mg × 3 = 990
mg/day → within range.
Step 2 – Wait: 330 mg q8h = 990 mg/day; 990 ÷ 22 = 45 mg/kg/day → SAFE.
Step 3 – But 330 mg q8h is 15 mg/kg/dose; recommended initial dosing is 10–15
mg/kg/dose. Dose is at upper limit—confirm with prescriber to avoid early
nephrotoxicity.
Why the Others are Incorrect
A assumes dose is safe without verification.
C is already ordered correctly.
D describes administration, not dose safety.
NCLEX Tip: Do the math first; if dose equals the exact upper limit, confirm—never
assume.
Q3
A client has an order for heparin 5,000 units IV push now. The vial reads 10,000
units/mL. Which action demonstrates best practice?
A. Withdraw 0.5 mL and administer without dilution.
B. Dilute 0.5 mL in 9.5 mL NS to equal 500 units/mL, then give 10 mL.
C. Ask a second nurse to observe waste and verify the 0.5 mL dose.
D. Use a 3-mL syringe with a 25-gauge ⅝-inch needle.
, ATI Mastery Rationale
Correct Answer: C
Nursing Principle: Independent Double-Check for High-Alert Anticoagulant
Step-by-Step Analysis
Step 1 – Key cue: High-alert medication with narrow therapeutic index.
Step 2 – Primary concern: Prevent overdose or underdose.
Step 3 – Correct action: Second nurse independently verifies dose volume (0.5 mL) and
witnesses waste.
Why the Others are Incorrect
A omits the required double-check.
B creates unnecessary volume and increases error risk.
D uses wrong needle length for IV push.
NCLEX Tip: For heparin and insulin, “independent double-check” is testable on every
exam.
Q4
A nurse is reconstituting cefazolin 500 mg IM. The 1-g vial label states: “Add 2.5 mL
sterile water = 330 mg/mL.” Which technique is correct?
A. Use 2.5 mL diluent, then withdraw 1.5 mL.
B. Use 3 mL diluent, then withdraw 1.2 mL.
