A torn bag and a smeared tube

A tube of venous whole blood arrives at your bench inside a leak-resistant transport bag. The bag seam has torn in transit, and the outer surface of the primary tube is visibly smeared with blood. Nothing about the order is unusual, and the patient's infection status is unknown, the way it almost always is at accessioning. The question in front of you is not whether this specimen is infectious. It is which exposure routes this specimen and this task put in front of you right now, and what stops each one.

A smeared tube exterior is a bloodborne and skin-contact risk before you even open the bag. Centrifuging it without a sealed cup adds an aerosol risk. Uncapping it after spinning adds a splash risk toward your face. Each of those routes has a specific control, and PPE is only one of the tools available.

Standard precautions under OSHA's Bloodborne Pathogens standard, 29 CFR 1910.1030, treat all human blood and certain body fluids as if they carry HBV, HIV, or another bloodborne pathogen, whether or not the specimen is labeled or flagged. CDC's standard precautions extend that idea further: blood, body fluids, secretions, excretions other than sweat, non-intact skin, and mucous membranes may all carry a transmissible agent, in every patient, in every setting, regardless of known infection status. You do not wait for a diagnosis to decide whether to protect yourself.

Treat the smeared tube as infectious the moment you see it, not after a result comes back.