The Board of Certified Safety Professionals (BCSP) offers the OHST exam to safety and hygiene technicians with 3 years of experience in which at least 35% of duties involve occupational hygiene or safety. This page gives the exam format, fees and retake rules from BCSP sources. It also links each official content area to our free practice sets and works through sample questions with full explanations.
The OHST has 4 questions, takes about 4 hours and costs $300[1][2][3] (Board of Certified Safety Professionals, verified Oct 23, 2026).
Numbers in brackets link to the official sources listed under Sources & last verified. Dates that have passed are removed automatically.
| Item | Detail | Source · Verified |
|---|---|---|
| Number of questions | Multiple choice, 4 options; about 12% unscored beta items[1] | Board of Certified Safety Professionals · Oct 22, 2026 |
| Time limit | 4 hours[2] | Board of Certified Safety Professionals · Oct 23, 2026 |
| Exam fee | $300 exam fee (plus $140 application fee)[3] | Board of Certified Safety Professionals · Oct 22, 2026 |
| Retake policy | At least 6 weeks between attempts[3] | Board of Certified Safety Professionals · Oct 22, 2026 |
| Validity | Kept with annual fee + recertification every 5 years[3] | Board of Certified Safety Professionals · Oct 22, 2026 |
| Renewal | $150 annual renewal fee; 20 recertification points every 5 years[2] | Board of Certified Safety Professionals · Oct 23, 2026 |
| Delivery | Computer-based at Pearson VUE test centers[4] | pearsonvue.com · Oct 26, 2026 |
| Eligibility | 3 years' experience with at least 35% of duties in occupational hygiene or safety; no degree required[3] | Board of Certified Safety Professionals · Oct 22, 2026 |
| Score release | Immediately on submitting the exam[3] | Board of Certified Safety Professionals · Oct 22, 2026 |
| Registration opens | Apply any time via BCSP My Profile[3] | Board of Certified Safety Professionals · Oct 22, 2026 |
| Testing window | Year-round; 1 year from application approval to test[3] | Board of Certified Safety Professionals · Oct 22, 2026 |
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.
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.
| Official content area | Weight | Practice on this site |
|---|---|---|
| Emergency Preparedness, Fire Prevention, and Security[5] | 11.5% | OHST Emergency Response & Incident Management Practise emergency action and fire prevention planning, fire classes and extinguisher selection, evacuation, and the basic steps of incident response. |
| Ethics and Professional Conduct[5] | 8.2% | OHST Professional Standards & Ethics Practise scenario questions where the right answer follows the formal reporting route, protects people first and keeps a documented record. |
| Fundamental Math and Science and Business Calculations/Analysis[5] | 11.3% | OHST Data Analysis & Reporting Practise unit conversions, incident and severity rates, basic statistics and simple cost-benefit calculations until you can set each one up without notes. |
| Hazard Identification and Control[5] | 21.1% | OHST Core Concepts & Fundamentals Practise spotting hazards in a described task and picking controls in hierarchy order, from elimination and substitution down to PPE. |
| Health Hazards and Basic Industrial Hygiene[5] | 15.8% | OHST Industrial Hygiene & Exposure Assessment Practise exposure limit terms such as PEL, TLV and IDLH, routes of entry, air sampling basics, noise and respirator selection. |
| Organizational Communication and Training/Education[5] | 12.6% | OHST Communication & Stakeholder Relations Practise choosing the right training method for an audience, measuring whether training worked, and communicating hazards clearly to workers and managers. |
| Safety, Health, and Environmental Programs (Includes Risk Management)[5] | 19.5% | OHST Risk Management & Assessment Practise risk assessment matrices, program elements such as audits and inspections, recordkeeping duties and how management systems tie these together. |
Prepare for the OHST Exam exam with our free practice test modules. Each quiz covers key topics to help you pass on your first try.
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.
Question: The designation 'IDLH' in industrial hygiene represents a concentration that is:
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.
Question: What is the appropriate action when discovering a colleague has violated professional standards?
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.
Question: What are the key characteristics of effective documentation?
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.
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.
The OHST exam costs $300, plus a $140 application fee. After you earn the credential, BCSP charges a $150 annual renewal fee to keep it active. Fees can change, so check the current amounts on the official BCSP OHST page before you apply.
No. BCSP does not require a degree for the OHST. 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 apply through the My Profile portal on bcsp.org, and BCSP confirms your eligibility before you can schedule the exam.
You have 4 hours. Every question is multiple choice with 4 options. About 12% of the questions are unscored beta items that BCSP is trying out for future exams, and they do not count toward your pass or fail result. Answer every question carefully and treat each as if it counts.
Right away. BCSP says official results are available as soon as you submit your exam, so you know your result before you leave the Pearson VUE test center. If you did not pass, your next attempt must be at least 6 weeks after the last one.
You have 1 year from the date BCSP finds you eligible to take and pass the exam. Testing is open year-round at Pearson VUE centers, and attempts must be at least 6 weeks apart. Book early enough in that year to leave room for a retake if you need one.
Pay the $150 annual renewal fee and earn 20 recertification points every 5 years. You earn points through activities that keep you current with professional practice, and you report them to BCSP. Check BCSP's recertification guidance to see which activities count.
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