100+ Free QLS Practice Questions

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How frequently must a Class II BSC be field-certified per NSF 49?

Daily

Only at installation

Every 5 years

Annually, after relocation, and after HEPA filter change (every 6 months in some institutional policies)

to track

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2026 Statistics

Key Facts: QLS Exam

Total Items

ASCP BOC

90 min

Exam Time

ASCP

~$260

Exam Fee

ASCP

0.75 ppm

Formaldehyde PEL

29 CFR 1910.1048

The ASCP QLS (Qualification in Laboratory Safety) is a 50-item, 90-minute, ~$260 qualification exam. Eligibility: 6 months lab safety experience in last 5 years. Master OSHA Bloodborne Pathogen Standard (29 CFR 1910.1030), HazCom/GHS, formaldehyde 29 CFR 1910.1048 limits (TWA 0.75 / STEL 2 / Action Level 0.5 ppm), RACE/PASS, BSC Class II A1/A2/B1/B2, and USP <800> with NIOSH 2024 list.

Sample QLS Practice Questions

Try these sample questions to test your QLS exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under OSHA's Bloodborne Pathogens Standard 29 CFR 1910.1030, how often must an employer review and update the Exposure Control Plan?

A.Every 6 months

B.Annually and whenever new tasks/procedures affect occupational exposure

C.Every 3 years

D.Only after a documented exposure incident

Explanation: 29 CFR 1910.1030(c)(1)(iv) requires the Exposure Control Plan to be reviewed and updated at least annually and whenever necessary to reflect new or modified tasks and procedures that affect occupational exposure, and to reflect new or revised employee positions with occupational exposure.

2An employee in a clinical chemistry lab declines the hepatitis B vaccine offered at no cost. What is the employer's correct action under 29 CFR 1910.1030?

A.Reassign the employee to a non-exposure role immediately

B.Have the employee sign the OSHA-mandated declination form and continue offering the vaccine if their mind changes

C.Document verbal refusal in the personnel file only

D.Terminate the employee for non-compliance

Explanation: OSHA requires the employee to sign the specific declination statement contained in Appendix A of 29 CFR 1910.1030. The employer must continue to make the vaccine available at no cost should the employee later choose to accept it.

3A phlebotomist sustains a needlestick from a source patient with documented HIV viremia. What is the recommended timeframe to initiate post-exposure prophylaxis (PEP)?

A.Within 24 hours, ideally as soon as possible

B.Within 72 hours; ideally within 1-2 hours of exposure

C.Within 7 days

D.Only after confirmatory HIV antibody testing of the exposed worker

Explanation: CDC and USPHS guidelines recommend HIV PEP be initiated as soon as possible, ideally within 1-2 hours and no later than 72 hours after exposure. Delay beyond 72 hours markedly reduces efficacy.

4Which biosafety level is appropriate for routine handling of clinical specimens potentially containing Mycobacterium tuberculosis prior to culture?

A.BSL-1

B.BSL-2

C.BSL-3

D.BSL-4

Explanation: Routine processing of clinical specimens (smears, PCR, etc.) is performed at BSL-2 with a Class II BSC. Once M. tuberculosis is propagated in culture, manipulations require BSL-3 containment.

5A 50 mL spill of blood occurs on a benchtop. Which disinfectant concentration is appropriate per CDC and OSHA guidance?

A.1:100 (1%) sodium hypochlorite

B.1:10 (10%) sodium hypochlorite for large spills with organic load

C.70% isopropyl alcohol

D.3% hydrogen peroxide

Explanation: For large spills involving organic material, a 1:10 dilution of household bleach (approximately 5,000-6,000 ppm available chlorine) is recommended. Smaller surface disinfection may use 1:100, but a 50 mL pooled spill warrants the stronger 1:10.

6Which respirator is the minimum acceptable for entering an isolation room of a patient with suspected pulmonary tuberculosis?

A.Surgical mask

B.N95 filtering facepiece respirator (after fit testing)

C.Half-face elastomeric with P100 cartridges only when N95 unavailable

D.Powered air-purifying respirator (PAPR) only

Explanation: CDC and OSHA require at minimum a NIOSH-approved N95 respirator with successful fit testing under 29 CFR 1910.134 for TB exposure. Higher-level respirators (PAPR, elastomerics) are acceptable but not required.

7How frequently must quantitative or qualitative N95 fit testing be repeated under OSHA 29 CFR 1910.134?

A.Once at hire only

B.Annually and whenever facial features change (weight loss/gain, surgery, dental work)

C.Every 5 years

D.Only after a known TB exposure

Explanation: 29 CFR 1910.134(f)(2) requires fit testing prior to initial use, whenever a different respirator facepiece is used, and at least annually thereafter. Re-testing is also required when facial changes affect fit.

8An airborne infection isolation room (AIIR) for TB patients must maintain what minimum air exchange rate per CDC guidelines for new construction?

A.At least 4 air changes per hour (ACH)

B.At least 6 ACH for existing rooms; at least 12 ACH for new/renovated

C.At least 15 ACH

D.At least 20 ACH

Explanation: CDC guidelines specify a minimum of 6 ACH for existing AIIRs and at least 12 ACH for new construction or renovation, along with negative pressure relative to surrounding areas and direct exhaust to the outside or HEPA filtration.

9A laboratorian is exposed to an HCV-positive source patient via deep needlestick. Current CDC management guidance is which of the following?

A.Begin pegylated interferon prophylaxis immediately

B.No prophylaxis; baseline and follow-up HCV RNA testing with early treatment if seroconversion occurs

C.HCV immunoglobulin within 24 hours

D.Empiric direct-acting antivirals for 4 weeks

Explanation: There is no recommended HCV post-exposure prophylaxis. CDC recommends baseline anti-HCV testing of the source and exposed worker, follow-up HCV RNA at 3-6 weeks, and initiation of direct-acting antivirals only if acute infection is documented.

10OSHA's Bloodborne Pathogens Standard requires medical records of exposed employees to be maintained for what duration?

A.5 years after termination

B.Duration of employment plus 30 years

C.Permanently in the institution

D.10 years from incident date

Explanation: 29 CFR 1910.1030(h)(1)(iv) requires confidential medical records to be maintained for the duration of employment plus 30 years, consistent with 29 CFR 1910.1020.

About the QLS Exam

ASCP BOC Qualification credential for clinical laboratory safety officers. Validates working knowledge of OSHA Bloodborne Pathogen Standard (29 CFR 1910.1030), Hazard Communication Standard (29 CFR 1910.1200, GHS pictograms, SDS 16-section format), formaldehyde regulations (29 CFR 1910.1048 — TWA 0.75 ppm, STEL 2 ppm), fire safety (RACE, PASS, fire extinguisher classes), radiation safety (ALARA, dose limits), PPE selection, biosafety cabinets, and USP <800> hazardous drug handling.

Questions

50 scored questions

Time Limit

90 minutes

Passing Score

Scaled

Exam Fee

~$260 (ASCP BOC)

QLS Exam Content Outline

20%

Biological Safety (BBP, TB, BSL)

OSHA BBP 29 CFR 1910.1030, exposure control plan, PEP, BSL-2 vs BSL-3, 10% bleach

20%

Chemical Hazards & HazCom

29 CFR 1910.1200 GHS, SDS 16 sections, formaldehyde limits, RCRA waste

15%

Fire Safety, Electrical, Emergency

RACE, PASS, fire extinguisher classes A-D, GFCI, eyewash 15 min

15%

Radiation & Physical Hazards

Alpha/beta/gamma, ALARA, dose limits 5 rem/yr, ergonomics, noise >85 dB

15%

PPE & Engineering Controls

PPE selection, BSC Class II A1/A2/B1/B2, fume hood, respiratory protection

10%

USP <800> Hazardous Drugs

NIOSH 2024 list, CSTDs, negative-pressure rooms, PPE, deactivation sequence

Regulatory & Incident Reporting

OSHA 300 log, sharps log NSPA 2000, near-miss vs incident, sentinel events

How to Pass the QLS Exam

What You Need to Know

Passing score: Scaled
Exam length: 50 questions
Time limit: 90 minutes
Exam fee: ~$260

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

QLS Study Tips from Top Performers

1Master OSHA BBP 29 CFR 1910.1030: exposure control plan, HBV vaccine, sharps disposal, PEP timing (HIV PEP <72h)

2Memorize formaldehyde limits: Action 0.5 / PEL 0.75 / STEL 2 ppm

3Know fire response RACE (Rescue/Alarm/Confine/Extinguish) + extinguisher PASS (Pull/Aim/Squeeze/Sweep) + classes A combustibles, B liquids, C electrical, D metal, K kitchen

4Apply BSC Class II distinctions: A1/A2 recirculate; B1 30/70; B2 100% exhaust (USP <800> HD)

5Understand USP <800>: NIOSH 2024 list (Group 1 antineoplastic, Group 2 non-anti, Group 3 reproductive risk); CSTDs; negative-pressure compounding; chemo PPE

Frequently Asked Questions

What does the OSHA BBP Standard require?

OSHA Bloodborne Pathogen Standard (29 CFR 1910.1030) requires: written exposure control plan; HBV vaccination offered to at-risk employees free of charge; engineering and work practice controls (sharps disposal, no recapping, hand hygiene, PPE); training annually; post-exposure evaluation/follow-up (HBV PEP — HBIG + vaccine if not immune; HCV monitoring; HIV PEP started <72h ideally <24h); recordkeeping (sharps injury log per NSPA 2000).

What are formaldehyde exposure limits?

Per OSHA 29 CFR 1910.1048: Action Level (AL) 0.5 ppm 8-hr TWA (triggers monitoring + medical surveillance); Permissible Exposure Limit (PEL) 0.75 ppm 8-hr TWA; Short-Term Exposure Limit (STEL) 2 ppm 15-minute. Formaldehyde is also classified as a known human carcinogen by NTP/IARC.

What's the difference between BSC Class II types?

All Class II BSCs provide PERSONNEL + PRODUCT + ENVIRONMENT protection via HEPA filtration. Type A1 (older, recirculates ~70% within cabinet, exhausts to room — limited chemical use); Type A2 (recirculates ~70%, exhausts ~30% — most common, can exhaust to room or canopy hood for low-level chemicals); Type B1 (recirculates 30%, hard-ducts 70% to outside — moderate chemical use); Type B2 (100% exhaust, no recirculation — for hazardous chemicals/radionuclides). USP <800> requires B2 for some HD compounding.

How should I study for ASCP QLS?

Plan 30-50 hours over 4-6 weeks. Focus on Biological Safety (20%) and Chemical Hazards/HazCom (20%) — together 40% of exam. Memorize OSHA citations (29 CFR 1910.1030, 1910.1048, 1910.1200, 1910.134), formaldehyde limits, GHS pictograms, BSC types, and USP <800> requirements with NIOSH 2024 list.