Which statement accurately describes specimen tube additives?

Which statement accurately describes specimen tube additives?

• A. Acidic additives preserve specimens for 24 hours
• B. Additives do not affect test results
• C. Some tubes contain anticoagulants or clot activators for specific tests
• D. All tubes are additive-free

Answer: (D)

Specimen tube additives are chosen to preserve the sample and to prepare it for the type of test being performed. Not all tubes are additive-free; many tubes contain substances that either prevent clotting (anticoagulants like EDTA, citrate, heparin, or oxalate) or promote clotting (clot activators) to suit specific tests, or include gel separators to isolate components after centrifugation. This means the statement that some tubes contain anticoagulants or clot activators for specific tests is accurate and reflects how additives are used to optimize test accuracy and sample handling. The idea that acidic additives preserve specimens for a fixed 24-hour period isn’t a universal rule, preservation depends on the additive and test requirements. Also, additives can and do affect test results if the wrong tube is used or the specimen isn’t processed properly. And not all tubes lack additives, since many are designed with specific additives for particular analyses.

Specimen tube additives are chosen to preserve the sample and to prepare it for the type of test being performed. Not all tubes are additive-free; many tubes contain substances that either prevent clotting (anticoagulants like EDTA, citrate, heparin, or oxalate) or promote clotting (clot activators) to suit specific tests, or include gel separators to isolate components after centrifugation. This means the statement that some tubes contain anticoagulants or clot activators for specific tests is accurate and reflects how additives are used to optimize test accuracy and sample handling. The idea that acidic additives preserve specimens for a fixed 24-hour period isn’t a universal rule, preservation depends on the additive and test requirements. Also, additives can and do affect test results if the wrong tube is used or the specimen isn’t processed properly. And not all tubes lack additives, since many are designed with specific additives for particular analyses.