17.2 Laboratory Safety

Bloodborne Pathogens And Standard Precautions In The Blood Bank

Blood banking is one of the highest-exposure areas in the clinical laboratory because the entire workflow — donor phlebotomy, component preparation, pooling, and crossmatch testing — involves direct, sustained contact with whole blood and blood components rather than small aliquots. The OSHA Bloodborne Pathogens Standard (29 CFR 1910.1030) and CDC Standard Precautions apply with extra weight here: every unit, segment, and specimen is treated as potentially infectious for HBV, HCV, and HIV regardless of the donor's screening history, because window-period infections and testing limitations mean no unit can be guaranteed pathogen-free.

Required personal protective equipment (PPE) for blood bank bench work and component manufacturing includes fluid-resistant gowns, gloves (changed between patients and donors and whenever visibly contaminated or torn), and face or eye protection whenever a procedure could generate splashes or aerosols — for example, expressing plasma from a bag, stripping tubing, or pooling cryoprecipitate. Employers must offer the hepatitis B vaccine series free of charge to at-risk employees, maintain a written exposure control plan, and provide post-exposure prophylaxis after a percutaneous or mucous-membrane exposure. PPE is donned gown, then mask, then goggles, then gloves, and doffed in reverse with gloves first, to avoid contaminating skin or clothing during removal.

Sharps and segment safety is a distinct blood-bank hazard: tubing segments are stripped and heat- or clip-sealed for retype and crossmatch testing, and improperly sealed segments or careless de-spiking of bags are common sources of needlestick-equivalent exposure. The Needlestick Safety and Prevention Act requires engineered sharps-injury protection and a sharps injury log; needles and spike sets are never recapped by hand and go directly into a puncture-resistant, leakproof, labeled sharps container. Expired or discarded blood components, filters, and tubing are biohazard waste and are segregated from chemical and general waste exactly as in any clinical laboratory — mixing chemical disinfectant waste into red biohazard bags, or vice versa, is a common wrong-action distractor on this exam.

Chemical Hazard Communication And Blood-Bank-Specific Emergencies

Every chemical used in the blood bank and donor center — low-ionic-strength saline (LISS) additive reagents, bleach disinfectant, ethanol, potentiators such as polyethylene glycol (PEG), and cryoprotectants such as dimethyl sulfoxide (DMSO) used to freeze hematopoietic progenitor cells — must have an accessible Safety Data Sheet (SDS) and be labeled per the hazard communication standard. DMSO deserves special attention on the SBB exam: it is rapidly absorbed through intact skin, carries other dissolved chemicals with it, and produces a garlic-like taste or odor on systemic absorption. Direct skin contact requires immediate washing and PPE upgraded to nitrile or butyl rubber gloves, since standard latex or vinyl gloves do not adequately protect against DMSO permeation.

Spill response follows the same general sequence as any clinical lab — contain, protect, notify, clean, document — with a blood-bank-specific twist: a blood or blood-product spill is decontaminated with a 10% sodium hypochlorite (bleach) solution (or an EPA-registered disinfectant effective against bloodborne pathogens), left in contact for the manufacturer's specified dwell time, and disposed of as biohazard waste; broken glass or sharps within the spill are never picked up by hand. A chemical spill kit matched to the specific hazard (acid, base, solvent) is used for reagent spills, and any spill involving a large volume or an unknown agent triggers evacuation and notification of the safety officer.

Cryogenic and radiation hazards are unique to blood banking's cellular therapy and irradiation functions. Liquid nitrogen storage of hematopoietic progenitor cells and rare frozen red cells presents cryogenic burn risk from direct contact and asphyxiation risk from nitrogen displacing oxygen in poorly ventilated freezer rooms; these rooms require oxygen-level monitors and alarm systems, and anyone entering a low-oxygen alarm area must not enter until the space is verified safe, or must do so with self-contained breathing apparatus. Facilities that operate a gamma irradiator (typically a sealed cesium-137 or cobalt-60 source) must follow Nuclear Regulatory Commission (NRC) or state agreement-state licensing requirements: source security, shielding integrity checks, personnel dosimetry badges worn during operation, posted radiation area signage, and an emergency plan specific to a jammed source or suspected leak that immediately calls the facility's radiation safety officer (RSO) and restricts access until the source is confirmed secure. X-ray-based irradiators avoid sealed radioactive source licensing and its associated security and transport burden, which is one reason many newer blood banks choose them, but they still require periodic dose verification and standard electrical safety precautions.

Standard universal emergency equipment still applies: an eyewash station delivering tepid water for a full 15 minutes for any chemical or blood splash to the eyes, a safety shower for large-volume body contamination, and fire response following RACE (Rescue, Alarm, Confine, Extinguish) with extinguisher use following PASS (Pull, Aim, Squeeze, Sweep). No mouth pipetting, eating, drinking, or applying cosmetics is permitted in any area where blood components or reagents are handled.

Written Programs, Ergonomics, And Compressed Gas

Under the OSHA Laboratory Standard (29 CFR 1910.1450), every blood bank and reference laboratory maintains a written chemical hygiene plan overseen by a designated chemical hygiene officer, with an accessible SDS library covering every chemical in use, including donor-center reagents and cleaning agents. This written-program requirement runs parallel to, and is distinct from, the exposure-control plan required by the Bloodborne Pathogens Standard — an exam stem describing a chemical exposure tests the Laboratory Standard, while one describing a blood or body-fluid exposure tests the Bloodborne Pathogens Standard.

Compressed-gas cylinders, used for some cell-processing and apheresis equipment, are stored upright, secured with a chain or strap to prevent tipping, transported with the protective cap in place, and kept away from heat sources; a dropped, unsecured cylinder with a sheared valve can become a projectile. Ergonomic hazards are common in blood bank operations that involve repetitive component labeling, pipetting, and lifting filled blood bags or coolers of units for shipment — facilities address this with adjustable workstations, mechanical lifting aids for large shipments, and task rotation to reduce cumulative strain injuries, which remain among the most frequent reportable injuries in blood centers even though they are less dramatic than a chemical or biological exposure.