1.1 CIH Exam Format, Scoring, and Test-Day Logistics

CIH Exam Format, Scoring, and Test-Day Logistics

Everything else in this guide teaches industrial hygiene. This section teaches the exam itself — the structure, the scoring model, and the test-day mechanics that decide whether your technical knowledge actually reaches the answer sheet. Candidates lose points to the format far more often than they admit: mis-budgeting time across two fixed sections, hunting for pilot questions, or discovering at the workstation that their own calculator is not allowed.

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1. Item Count and Delivery Structure

The CIH examination contains 180 multiple-choice questions. Of these:

Pilot items are being evaluated for use on future forms. They are written to the same specifications, formatted identically, and distributed throughout the exam. You cannot identify them, and any time spent trying to is time taken from items that count. Treat every question as scored, because five out of six are.

The exam is delivered in two sections of 2.5 hours each, with one optional 30-minute break between them:

+---------------------------------------------------------------+
|  Tutorial  |   SECTION 1    |  Break   |   SECTION 2   | Survey |
|  (short)   |   2.5 hours    | 30 min   |   2.5 hours   |        |
|            |                | optional |               |        |
+---------------------------------------------------------------+
                              ^
                    If you take the break, you get
                    exactly 30 minutes. Section 2 starts
                    at the 30-minute mark whether you are
                    back or not.

Within a section you may move freely — review, flag, and change answers. You cannot return to Section 1 once Section 2 begins. Budget accordingly: with 90 items per section over 150 minutes, the average pace is 100 seconds per item. Calculation-heavy ventilation and dosimetry items will run long, so bank time on the recall items.

A short tutorial precedes the exam and a short survey follows it; neither consumes testing time. The exam software also lets you submit comments on specific items. BGC staff review those comments, but will not discuss them with you.

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2. How the Exam Is Scored

This is the single most misunderstood aspect of the CIH, and prep vendors routinely publish numbers BGC has never endorsed.

• Your score is the total number of scored questions answered correctly. There is no penalty for a wrong answer, so never leave an item blank — a guess has positive expected value.
• The passing score is criterion-referenced. A panel of Certified Industrial Hygienists established it using standard-setting procedures under the guidance of BGC's psychometric partner, Certiverse. It reflects the performance expected of a minimally competent CIH, not a percentile of the candidate pool.
• Each administration is statistically equated. Because forms vary slightly in difficulty, the raw number correct required to pass is adjusted so that candidates across years are held to the same competency standard.
• BGC does not publish a passing percentage. Any source telling you "you need 70%" is inventing a number. Results are reported as pass or fail.
• There is no per-subject-area minimum. You do not have to pass Toxicology and Ventilation separately; a weak area can be offset by strength elsewhere. That said, BGC states you should expect questions in all subject areas, so a large blind spot is dangerous in aggregate even though it is not individually disqualifying.

Exam strategy consequence: because scoring is compensatory across subject areas and there is no guessing penalty, breadth beats depth-in-a-few-areas. A candidate who is competent in sixteen areas will outscore one who is expert in eight and blank in eight.

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3. Calculators, Equation Sheets, and Scratch Work

BGC changed the calculation environment, and the changes are frequently missed by candidates studying from older materials.

Two practical implications:

1. Practise with an on-screen calculator, not your field calculator. Pearson VUE publishes a practice calculator at pearsonvue.com/athena. Keystroke fluency with logarithms, exponentials, and square roots on an unfamiliar interface is worth real points on decibel and dilution items.
2. The equation sheet gives you formulas without telling you when to use them. It will list the dilution ventilation equation; it will not tell you that the problem you are reading is a purge problem rather than a steady-state problem. Memorising formulas is less valuable than recognising which physical situation you are in — which is how this guide is organised.

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4. Identification and Test Center Rules

• Bring one original, unexpired, government-issued photo ID with your name, photograph, and signature. The first and last name must match your registration exactly. A mismatch means you do not test and you forfeit the fee.
• All personal items other than the ID go in a locker outside the testing area.
• You may take unscheduled breaks, but no additional time is granted for time lost.
• Remote proctoring is not available — BGC suspended remote proctored testing for its exams. All CIH testing is at Pearson VUE test centers.

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5. Putting the Format to Work