Which anticoagulant is recommended when a body fluid that may clot is sent for microbiologic examination?

Which anticoagulant is recommended when a body fluid that may clot is sent for microbiologic examination?

• A. Sodium polyanetholesulfonate (SPS)
• B. Heparin
• C. Sodium EDTA
• D. Sodium citrate

Answer: (A)

When collecting a body fluid that may clot for microbiologic culture, you want to prevent clotting without harming the bacteria you’re trying to detect. Sodium polyanetholesulfonate does exactly that. It acts as an anticoagulant, keeping the specimen in a fluid state so bacteria aren’t trapped in a clot, which helps recovery in culture. It also helps preserve organisms by reducing some immune and chemical activities in the sample that could kill or inhibit them, leading to better yields of the pathogens you're trying to grow. Other anticoagulants can interfere with culture results. Heparin, EDTA, and citrate can affect bacterial growth or downstream tests, or simply aren’t as compatible with culture methods, making them less suitable for specimens intended for microbiologic examination.

When collecting a body fluid that may clot for microbiologic culture, you want to prevent clotting without harming the bacteria you’re trying to detect. Sodium polyanetholesulfonate does exactly that. It acts as an anticoagulant, keeping the specimen in a fluid state so bacteria aren’t trapped in a clot, which helps recovery in culture. It also helps preserve organisms by reducing some immune and chemical activities in the sample that could kill or inhibit them, leading to better yields of the pathogens you're trying to grow.

Other anticoagulants can interfere with culture results. Heparin, EDTA, and citrate can affect bacterial growth or downstream tests, or simply aren’t as compatible with culture methods, making them less suitable for specimens intended for microbiologic examination.