OHST Practice Test

OHST Exam at a Glance

What the OHST is and how it works

According to Board of Certified Safety Professionals, “Roughly 12% of the questions on your exam are beta questions BCSP is piloting for potential use in future exams. These questions are unscored and will not count toward your pass/fail result.”^[1]

The Occupational Hygiene and Safety Technician (OHST) credential from BCSP is for technicians whose work covers hazard control, industrial hygiene and safety programs. No degree is required. You need 3 years of experience in which at least 35% of your job duties required technical skills and knowledge in occupational hygiene or safety. You can apply at any time through the My Profile portal on bcsp.org.

The exam costs $300, plus a $140 application fee. It is computer-based and taken at Pearson VUE test centers, with testing open year-round. Once BCSP finds you eligible, you have 1 year to take and pass the exam.

You get 4 hours. Every question is multiple choice with 4 options. About 12% of the questions are unscored beta items that BCSP is piloting for future exams. They do not count toward your result, but answer every question as if it counts. Official results are available as soon as you submit. If you need another attempt, it must be at least 6 weeks after your last one.

To keep the credential, you pay a $150 annual renewal fee and earn 20 recertification points every 5 years. Fees and policies can change, so check current details on the official BCSP OHST page before you apply or book.

OHST content outline and where to practise each area

The content areas below are copied from the official OHST content outline published by Board of Certified Safety Professionals, with the share of the exam each area carries. The right-hand column shows which of our practice sets covers it.

Worked examples: how to reason through OHST questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: The designation 'IDLH' in industrial hygiene represents a concentration that is:

1. Immediately Dangerous to Life or Health
2. Indirectly Damaging to Lung Health
3. Immediately Detectable at Low Hazard levels
4. Intermittently Dangerous at Low Heights

Answer: A. Immediately Dangerous to Life or Health

Explanation:

A is correct. IDLH stands for Immediately Dangerous to Life or Health. NIOSH uses the term for an airborne concentration that is an immediate threat to life, could cause irreversible health effects, or would stop a worker from escaping unaided. It drives respirator selection: an IDLH atmosphere calls for the most protective options, such as a pressure-demand SCBA.

B makes up a lung-only meaning, but IDLH covers any serious harm, not only lung damage. C gets the idea backwards: IDLH describes a severe hazard, not a low one, and says nothing about detection. D brings in fall hazards, which have nothing to do with airborne exposure values.

Rule to remember: IDLH is the NIOSH escape threshold. It sits far above routine exposure limits such as PELs and TLVs, and it calls for the highest level of respiratory protection.

Example 2

Question: What is the appropriate action when discovering a colleague has violated professional standards?

1. Report through proper channels as outlined in the code of ethics
2. Ignore it to maintain the relationship
3. Handle it privately without documentation
4. Post about it on social media

Answer: A. Report through proper channels as outlined in the code of ethics

Explanation:

A is correct. Professional codes of ethics expect you to report violations through the channels the code sets out, such as a supervisor, a compliance process or the certifying body. This protects workers and the public and leaves a record that can be reviewed fairly.

B puts a personal relationship ahead of safety and leaves the risk unaddressed. C may feel kinder, but without documentation nobody can check what happened or whether it was fixed, and it may itself break your reporting duty. D skips due process, can damage reputations unfairly and may expose confidential information.

Rule to remember: on ethics questions, choose the answer that is documented, uses the formal route and puts the protection of people first. Answers that are informal, private or public shaming are almost always wrong.

Example 3

Question: What are the key characteristics of effective documentation?

1. Accurate, complete, timely, legible, and objective
2. Brief, opinionated, and created after the fact
3. Detailed enough to fill required page counts
4. Created only when requested by supervisors

Answer: A. Accurate, complete, timely, legible, and objective

Explanation:

A is correct. Good safety records are accurate, complete, timely, legible and objective. Accurate and complete records show what really happened. Timely means written while the details are fresh. Legible means anyone can read them later. Objective means facts and observations, not blame or opinion. Incident reports, inspection logs and training files may be read by regulators, insurers or lawyers, so each quality matters.

B is wrong because opinions undermine objectivity, and records written after the fact lose detail. C mistakes length for quality, and padding buries the key facts. D makes record keeping reactive, so gaps show up exactly when the records are needed.

Rule to remember: record things promptly, stick to observable facts, and write enough that someone who was not there could follow what happened.

How to use these practice tests

Start with the official BCSP outline and the table above. Hazard Identification and Control and the Safety, Health, and Environmental Programs area carry the most weight, so give them the most practice time.

1. Take a short timed run in OHST Core Concepts & Fundamentals to find your weak areas before you study.
2. Work through the content areas one at a time using the matched sets. After each set, read every explanation, including for the questions you got right, and write down the rule behind each answer.
3. Do not skip the calculations. Use OHST Data Analysis & Reporting to drill rates, conversions and basic statistics until you can set them up quickly.
4. Keep an error log. Each week, retry the questions you missed and note whether you lacked the knowledge or misread the question.
5. In your final weeks, mix sets from different areas and build stamina for a 4-hour sitting.
6. Book your Pearson VUE date well inside your 1-year eligibility window, so there is time for a retake 6 weeks later if you need one.

Sources & last verified

1. Board of Certified Safety Professionals — number of questions (official source). “Roughly 12% of the questions on your exam are beta questions BCSP is piloting for potential use in future exams. These questions are unscored and…” Verified Oct 22, 2026 · source checked Oct 18, 2026.
2. Board of Certified Safety Professionals — time limit, renewal (official source). “Renewal Fees $150 Exam Time 4 hours Recertification 20 points OHST Webpage” Verified Oct 23, 2026 · source checked Oct 23, 2026.
3. Board of Certified Safety Professionals — exam fee, retake policy, validity, eligibility (official source). “The OHST examination is $300 for a single examination.” Verified Oct 22, 2026.
4. pearsonvue.com — delivery (official source). “The Board of Certified Safety Professionals (BCSP) has partnered with Pearson VUE to deliver computer-based certification examinations at locations throughout the world.” Verified Oct 26, 2026 · source checked Oct 26, 2026.
5. Board of Certified Safety Professionals — other (official source). “emergency preparedness fire prevention and security 11.5%” Verified Oct 28, 2026.

How we verify: editorial & fact-checking policy. Report an error: contact us.