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Questions and Answers
True or false: The blood culture tubes are always drawn first regardless of whether blood culture has been ordered or not.
False
True or false: The light blue-top citrate tube is collected first if blood culture has not been ordered.
True
True or false: Serum tubes are drawn before the citrate tube if blood culture has not been ordered.
False
True or false: Specimens for glucose, triglycerides, and cholesterol tests are collected when the patient has been fasting for a number of hours.
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True or false: Diurnal variation can occur with certain blood constituents such as iron and corticosteroids.
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Study Notes
Blood Culture Tube Collection
- Blood culture tubes should be drawn first only when a blood culture is ordered.
- If blood culture is not ordered, other tube types may be collected first based on protocol and tests ordered.
Light Blue-Top Citrate Tube Collection
- The light blue-top citrate tube is collected first only if blood culture has not been ordered, following a specific order of draw.
Serum Tube and Citrate Tube Order
- Serum tubes should be drawn before the citrate tube if blood culture has not been ordered, necessary for accurate test results.
Fasting Specimens
- Specimens for glucose, triglycerides, and cholesterol testing must be collected after the patient has fasted for a certain number of hours, typically 8-12 hours.
Diurnal Variation
- Certain blood constituents, including iron and corticosteroids, exhibit diurnal variation, meaning their levels fluctuate at different times of the day which can affect test results.
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Description
Test your knowledge of the order of draw and instrumentation in venipuncture with this quiz. Learn about the proper collection order of specimens and essential rules to follow during blood sample collection.
