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Questions and Answers
What is the most significant source of error in blood collection if immediate laboratory delivery is not possible?
Why should blood samples collected in a plastic syringe be analyzed within 30 minutes of collection?
Which condition does NOT necessitate the icing of blood samples?
How do blood cells continuing to respire after collection affect the specimen?
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After how long must iced samples be delivered to the laboratory?
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What is a common effect of allowing air bubbles to enter the syringe during blood collection?
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Which of the following scenarios does not usually require the use of ice?
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Which practice during blood collection can lead to decreased carbon dioxide readings?
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Which of the following is NOT a suitable way to handle a specimen for extended testing time?
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What effect does exposing a blood specimen to the atmosphere after collection have?
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Study Notes
Phlebotomy Techniques and Procedures
- Proper capping and mixing of syringes are essential to prevent clot formation when collecting specimens.
- For arterial blood gas (ABG) collection from alternative sites (brachial, femoral):
- Procedures resemble those for radial ABGs.
- Phlebotomists typically do not collect specimens from these sites but may assist in equipment and labeling.
Site Care and Monitoring
- Ensure the collection site is normal in color, warm, and free from bleeding or swelling.
- Reapply pressure if bleeding, swelling, or bruising occurs until bleeding stops.
- After initial assessment, check the site again after 2 minutes, ensuring no further complications.
Arterial Puncture Guidelines
- Insert the needle at a 10-degree angle into the predetermined site.
- Locate the radial artery by palpating with the nondominant index finger; avoid using the thumb due to misleading pulse feedback.
Sample Handling and Common Errors
- Blood specimens must be delivered to the lab without delay or iced if transportation takes longer than specified times:
- Plastic syringes: Analyze within 30 minutes.
- Glass syringes: Ice if not delivered within 5-10 minutes; iced samples should arrive at the lab within 1 hour.
- Do not use ice for potassium tests, as lower temperatures can affect results.
Potential Complications
- Arteriospasm may occur—a spontaneous arterial constriction in response to pain.
- Clotting in the specimen can occur; prevent this by ensuring prompt handling.
- Samples must be free from air bubbles, which can decrease carbon dioxide readings, and should not be exposed to atmospheric conditions after collection.
- Specific labeling and proper storage are critical to maintain specimen integrity.
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Description
This quiz covers the procedures and techniques for collecting blood samples, including capillary blood gas sampling and proper handling of specimens.
