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United States · Credentialing exam

Free NBRC practice test

This free NBRC practice test has 20 four-option questions we wrote, spread across the content areas of the National Board for Respiratory Care (NBRC) TMC Detailed Content Outline: patient data, assessment, diagnostic tests, equipment, airway care, ventilation and the care plan. Each answer has a short rationale. NBRC’s own exams are far longer, so use this as a quick check of what you know.

  • 20Practice questions on this page
  • 14Right answers for our 70% target
  • 4Answer options, as on the TMC and RT Examination
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Updated October 2026 · Written from official sources, listed at the bottom of this page

Question 1 of 20

An arterial blood gas in the chart shows pH 7.28, PaCO2 58 mm Hg and HCO3 26 mEq/L. How should it be interpreted?

20 practice questions in the style of the exam.

How to use this free NBRC practice test

Aim for 14 out of 20, which is 70%. That’s our own target, not an NBRC cut score; the real exams set their own cut scores instead of a percentage. After each answer you can ask the tutor to explain it another way, and the ones you miss come back at the end.

Diagnostic procedures get the most questions, as they do on the outline. The questions follow the TMC outline. From January 4, 2027, the RT Examination replaces the TMC and has its own content outline, so check that one too if you test then.

NBRC cut scores and pass rates →The content outlines, section by section →

Where can you take NBRC’s own free practice test?

NBRC gives away a free practice exam for each of its credentialing exams, including the TMC and the RT Examination, and its paid Self-Assessment Examinations explain every answer. Our 20 questions don’t come from NBRC, so take its practice exam too: it runs in the same software as the real test.

NBRC’s practice exams and SAEs →
Sources: NBRC. Checked October 2026.

Rules and fees can change, so check the official site before your test.

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