Name a common pre-analytical interference caused by medications and how to mitigate?

Prepare for the CAMLPR Specimen Collection Competency Test. Practice with diverse question sets including multiple-choice and flashcards. Each question includes hints and explanations to help you become proficient before the exam.

Medications can change the composition of a specimen before analysis, and a frequent example is lipemia caused by lipid-soluble drugs. When these drugs raise the fat content in blood, the sample becomes milky and triglyceride-rich. That lipemic background can interfere with many tests by scattering light and altering assay accuracy, leading to falsely high or low results for various analytes.

Mitigation comes from collecting the sample exactly as instructed and, importantly, noting the patient’s medications. Following pre-collection instructions (such as fasting if required and timing around drug administration) helps minimize lipemia, and documenting all meds allows the lab to interpret results correctly, possibly adjust testing approaches, or flag potential drug-induced interference for review.

Other issues like hemolysis from rough handling, dehydration, or coagulation changes from anticoagulants are separate pre-analytical concerns that are addressed by proper handling, patient prep, and tube selection, but they are not the same medication-related lipemic interference described here.