9.7 Emergency Response, Spill Management & Specimen Packaging and Transport

Emergency Response, Spill Management & Specimen Packaging and Transport

The content guideline lists emergency procedures (needlesticks, splashes to mucous membranes, fire) and packaging and transportation of specimens as named safety sub-topics. These are procedural questions: the examination asks what you do first, and in what order.

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1. Occupational Exposure Response

Immediate First Aid (Do This Before Reporting)

Reporting and Post-Exposure Management

Report to the supervisor and employee health service immediately, because the effectiveness of prophylaxis is time dependent.

• Source patient testing for HIV, hepatitis B surface antigen, and hepatitis C, with consent as required by state law.
• Baseline testing of the exposed employee, then follow-up testing at intervals.
• HIV. Post-exposure prophylaxis should start as soon as possible, ideally within hours, and is generally not recommended beyond 72 hours; a typical course runs 28 days.
• Hepatitis B. An unvaccinated or non-responding employee exposed to a surface-antigen-positive source receives hepatitis B immune globulin plus initiation of the vaccine series, ideally within 24 hours and no later than 7 days.
• Hepatitis C. There is no vaccine and no post-exposure prophylaxis; management is serial testing (HCV RNA and antibody) and early treatment if infection is documented.
• The event is recorded in the sharps injury log with the device type and brand, the department, and an explanation of the circumstances.

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2. Spill Management

Blood and Body Fluid Spills

1. Alert others and restrict access.
2. Don PPE: gloves, fluid-resistant gown, and face protection; add shoe covers for large spills.
3. Remove broken glass with forceps, a brush and dustpan, or cardboard, never with gloved hands, and place it in a sharps container.
4. Absorb the liquid with absorbent powder or pads and discard as regulated medical waste.
5. Disinfect with a freshly prepared 1:10 dilution of household bleach (about 5,000 ppm available chlorine) or an EPA-registered tuberculocidal disinfectant, allowing the manufacturer's stated contact time, commonly 10 minutes. Sodium hypochlorite dilutions degrade, so they are prepared daily.
6. Rinse and dry, remove PPE, perform hand hygiene, and document the event.

Bleach must never be mixed with acids (which release chlorine gas) or with ammonia (which releases chloramine gas), and it corrodes stainless steel, so surfaces are rinsed afterward.

Chemical Spills

Consult the safety data sheet. Small spills of known low-hazard chemicals are handled with the appropriate spill kit: an acid or base neutralizer, or a universal absorbent. Large spills, unknown chemicals, or any spill producing vapors require evacuation and the facility's emergency response team. Mercury requires a dedicated mercury spill kit and never a standard vacuum cleaner.

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3. Fire Response

Fire Classes and Extinguishing Agents

A Class ABC multipurpose dry chemical extinguisher covers the first three classes and is the common laboratory unit; carbon dioxide is preferred around instruments because it leaves no residue.

The Two Acronyms

• RACE is the response sequence: Rescue anyone in immediate danger, Alarm (pull the alarm and call), Confine the fire by closing doors, Extinguish if small and you are trained, or Evacuate.
• PASS is the extinguisher technique: Pull the pin, Aim at the base of the fire, Squeeze the handle, Sweep side to side.

Aiming at the flames rather than the base is the most common error, because the fuel is at the base.

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4. Waste Handling

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5. Packaging and Transportation of Specimens

Shipping is governed by U.S. Department of Transportation regulations (49 CFR) and, for air transport, IATA Dangerous Goods Regulations. Training is required and must be renewed, typically every two to three years depending on the mode.

Classification

Triple Packaging (Required for All Three Categories)

1. Primary receptacle: leak-proof, watertight, containing the specimen.
2. Absorbent material: sufficient to absorb the entire contents of all primary receptacles, placed between the primary and secondary layers.
3. Secondary packaging: leak-proof and watertight.
4. Rigid outer packaging with at least one surface measuring 100 x 100 mm, bearing the UN 3373 diamond mark and the words "Biological Substance, Category B" adjacent to it, plus an itemized list of contents between the secondary and outer layers.

Refrigerants. Dry ice is itself a regulated dangerous good (UN 1845, Class 9). It is placed outside the secondary packaging, the outer container must permit carbon dioxide gas to vent so it cannot pressurize and rupture, and the net weight of dry ice must be declared on the package.

In-facility transport. Pneumatic tube systems accelerate delivery but generate mechanical stress; excessive acceleration causes hemolysis, falsely raising potassium and lactate dehydrogenase and interfering with plasma free hemoglobin measurement. Systems must be validated against hand delivery for the analytes affected, and certain specimens such as those for platelet function testing and some coagulation studies are excluded.