20.3 Laboratory Safety

20.3 Laboratory Safety

Quick Answer: 29 CFR 1910.1030 is the OSHA Bloodborne Pathogens standard: standard precautions, PPE, sharps controls, hepatitis B vaccine, and a written exposure-control plan. A needlestick or mucous-membrane splash is wash or flush, report immediately, baseline HIV/HBV/HCV, source testing, PEP when indicated. 29 CFR 1910.1450 is chemical hygiene; the SDS is the 16-section hazard sheet. Fire is RACE and PASS. Eyewash runs 15 minutes. Broken centrifuge: wait ~30 minutes before opening. Liquid nitrogen around frozen units can kill by asphyxiation or cold injury.

The June 9, 2026 BB outline lists VI.B Safety and the emergency procedures that go with it. This is worker and facility safety, not transfusion-reaction management (Chapter 18). If the stem has blood on a glove, methanol in the KB stain, a smoking wastebasket, or a hissing dewar, answer it here.

Bloodborne pathogens and standard precautions

OSHA 29 CFR 1910.1030 assumes blood and other potentially infectious materials can carry HBV, HCV, and HIV (and, in a transfusion service, every other TTD you already issue lookback for). Standard precautions means you treat every tube, segment, unit, and spill the same — not only the HIV-labeled autologous bag.

The employer must keep an exposure-control plan, offer hepatitis B vaccination, provide PPE at no cost, use engineering controls (sharps containers, safety needles, segmented tubing rather than scissors-and-spray), and train staff. Eating, drinking, applying cosmetics, and handling contact lenses at the bench are prohibited. Mouth pipetting is prohibited. Recapping a needle with two hands is prohibited; if a specific procedure still requires recapping, it is a one-handed scoop named in the SOP, not a habit.

PPE in the blood bank is task-driven:

• Gloves for any blood contact — tubes, segments, packing ice that melted into a box of units, the serofuge splash shield you just wiped.
• Gown or fluid-resistant lab coat, closed, while testing or packing components.
• Face protection (mask plus goggles, or a face shield) when a splash is reasonably anticipated: opening a centrifuged tube, deglycerolizing, thawing plasma, clearing a clogged cell washer, handling a leaking unit.
• Remove PPE before leaving the laboratory. Do not wear bloody gloves to the cafeteria or the OR front desk.

Sharps (needles, broken tubes, lancets, segment cutters, capillary tubes from a KB smear) go into a closable, puncture-resistant, leak-proof, labeled container. Do not overfill. Do not reach into a sharps box. A unit segment is a sharp once you cut it.

Needlestick and mucous-membrane exposure protocol

The exam wants the order.

1. Immediate first aid. For a percutaneous injury, wash with soap and water. Do not squeeze the wound to “bleed it out.” Do not inject bleach or alcohol into the puncture. For a splash to eyes, nose, or mouth, flush with water or saline. Eyes go to the eyewash for 15 minutes.
2. Report immediately to the supervisor and occupational health (or the emergency department after hours). Immediate means now, not after you finish the antibody panel. HIV post-exposure prophylaxis is time-critical — hours, not the next business day.
3. Source-patient testing as permitted by law and policy (HIV, HBV, HCV). The source is often a pretransfusion specimen or the implicated unit’s segments.
4. Baseline testing of the exposed worker — HIV, HBV (and anti-HBs if vaccine history is unclear), HCV — plus first aid documentation.
5. Prophylaxis and follow-up. HBV: vaccine and/or HBIG if the worker is not immune. HCV: no routine PEP; arrange follow-up RNA/antibody testing. HIV: start PEP immediately when indicated; occupational-health protocols use combination antiretrovirals. Follow-up serology is scheduled (commonly out to 6 months, or shorter with RNA testing per current employee-health protocol).

A mucous-membrane splash of donor plasma is the same reporting pathway as a needle. A unit that leaked into an ungloved cut is a percutaneous exposure. “I already had hepatitis B vaccine in 2014” does not cancel the report.

Chemical hygiene, SDS, formaldehyde, and methanol

29 CFR 1910.1450, the Laboratory Chemical Hygiene Standard, requires a written chemical hygiene plan, a designated chemical hygiene officer, training, and engineering controls (fume hood when the SOP says so). Hazard communication (29 CFR 1910.1200) puts a safety data sheet on every hazardous chemical. The current SDS is the 16-section format (identification, hazards, composition, first aid, fire, spill, handling, exposure controls, physical properties, stability, toxicology, ecological, disposal, transport, regulation, other). If you cannot produce the SDS for methanol or formaldehyde, the chemical hygiene plan is already broken.

Blood-bank chemicals that actually appear on this exam:

• Methanol — fixes KB and other smears; also appears in some stain sets. Flammable and toxic. Keep away from open flame; use small volumes; know the eyewash path.
• Formaldehyde / formalin — some elution, tissue, or older method SOPs still use it. Sensitizer and carcinogen. Work in ventilation; do not store a cracked bottle under the serofuge.
• Acids used in KB acid elution, glycine-HCl / EGA, and some eluates — splash hazard, hence the eyewash.
• Disinfectants (bleach, accelerated hydrogen peroxide, quats). Bleach and protein make a mess; follow the contact time the SOP names. Never mix bleach and ammonia-type cleaners.
• Liquid nitrogen is both a chemical asphyxiant and a physical hazard (below).

Spill response is in the chemical hygiene plan: alert, evacuate if the inhalation risk is high, PPE, contain from the outside in, dispose as hazardous waste when the SDS says so. A methanol spill next to a lit Bunsen burner is a fire plan, not a paper-towel plan.

Eyewash and safety shower must be reachable in about 10 seconds, unobstructed, and capable of tepid, continuous flow for 15 minutes. Weekly activation keeps the water clean. If the stem is acid or methanol in the eyes, the answer is the eyewash first, then occupational health — not a bottle of sterile saline from the platelet incubator.

Fire, centrifuge breakage, biohazard waste, and liquid nitrogen

Fire. RACE: Rescue anyone in immediate danger, Alarm (pull station / call), Confine (close doors, shut off gas if you can), Extinguish if the fire is small and you are trained or Evacuate. PASS: Pull the pin, Aim at the base, Squeeze, Sweep. Blood-bank fuel includes methanol, alcohol burners in older KB methods, cardboard shippers, and overstocked storage rooms. Know the extinguisher type your SOP names; do not throw water on a flammable-liquid fire if the extinguisher in your hand is the wrong class.

Centrifuge breakage. A tube of plasma that shatters at 3,000 rpm is an aerosol event. Power the centrifuge off. Do not open the lid immediately. Wait about 30 minutes for aerosols to settle (follow the local biosafety SOP if it specifies a time). Then open in PPE (gloves, gown, face protection), pick glass with forceps not fingers, and disinfect the bowl and lid with the approved agent and contact time. Broken glass goes in sharps, not a red bag that a housekeeper will later compress.

Biohazard waste. Liquid blood, saturated gauze, used tubing, and leaking units go in red-bag or otherwise labeled biohazard waste. Segments, capillaries, and broken coated tubes go in sharps. A barely pink glove is usually regular trash once it is not dripping — follow the facility definition rather than inventing one. Never place a leaking unit in the staff refrigerator “until QA looks at it.”

Liquid nitrogen and frozen units. Frozen/deglycerolized red-cell programs store product in LN2 vapor-phase dewars or in mechanical freezers at ≤ −65 °C. LN2 is −196 °C. Hazards are cryogenic burns, eye injury, and asphyxiation as nitrogen gas displaces oxygen in a small room or elevator. Wear a face shield and cryo gloves. Do not seal LN2 in a tight container. Do not ride a small elevator with a venting dewar as if it were a box of paper. If a dewar tips and the oxygen alarm sounds, evacuate — do not “just finish pulling the two O-neg frozen units.” Thawing and deglycerolizing those units is a manufacturing procedure (Chapter 4.1); the safety point here is the cryogen, not the 24-hour post-thaw expiration.

Emergency procedures the outline expects

Power failure sits on the safety/operations border: protect products on validated emergency power or move them with continuous temperature monitoring. That movement is a planned procedure if you wrote it beforehand, and an occurrence if you did not.