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| Section | Objectives |
|---|---|
| Topic 1: Specimen Collection | - Order of draw and tube handling - Venipuncture techniques - Capillary puncture procedures |
| Topic 2: Safety and Compliance | - Infection control and PPE usage - Needlestick prevention and biohazard disposal - OSHA standards and safety protocols |
| Topic 3: Specimen Processing and Handling | - Quality control and rejection criteria - Labeling and documentation - Specimen transport and storage |
| Topic 4: Patient Preparation | - Explaining procedures and obtaining consent - Patient identification and communication - Site selection and preparation |
| Topic 5: Professional Practice | - Ethics and patient confidentiality (HIPAA) - Communication and professionalism |
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NEW QUESTION # 73
Which of the following can cause a preanalytic error for serum bilirubin?
Answer: C
Explanation:
Light exposure can cause a preanalytic error for serum bilirubin because bilirubin is light-sensitive. If a bilirubin specimen is exposed to light for too long, photodegradation can occur, leading to falsely decreased bilirubin results. This is why bilirubin specimens are commonly protected from light by using an amber container or wrapping the specimen in foil according to facility procedure. "Population" is not a specimen-handling variable that directly causes bilirubin degradation. "Pollutants" is too vague and does not identify the specific preanalytical issue tested here. "Location" may matter for collection site selection in some contexts, but it is not the classic handling error for bilirubin. The phlebotomist must know which specimens require special handling for light, temperature, time, transport, and processing. Failure to protect light-sensitive analytes can compromise specimen integrity before testing even begins, producing inaccurate laboratory results despite correct venipuncture technique. The NHA CPT outline directly includes maintaining specimen integrity based on handling requirements such as temperature, light, and time, as well as recognizing the impact of preanalytical errors on test results. Reference topics: Processing Specimens; bilirubin handling; light protection; preanalytical error.
NEW QUESTION # 74
Which of the following types of medication is an indication for an INR draw?
Answer: D
Explanation:
An anticoagulant is the medication type most directly associated with an INR draw. INR, or international normalized ratio, is used to evaluate clotting time and is especially important for monitoring patients who take warfarin or other anticoagulant therapy. These medications reduce the blood's ability to clot, so laboratory monitoring helps determine whether the patient is within the therapeutic range or at risk for bleeding or clotting complications. Anti-inflammatory medications may affect bleeding risk in some situations, but they are not the primary indication for an INR draw. Antihistamines are used for allergic symptoms, and antiemetics are used for nausea or vomiting; neither is routinely monitored by INR. From a phlebotomy standpoint, anticoagulant therapy also alerts the technician to apply pressure longer after venipuncture and observe for prolonged bleeding. Reference topics: Special Collections; coagulation testing; point-of-care INR; medication-related collection considerations; hemostasis. The NHA CPT test plan includes special collections, waived testing, and coagulation/hemostasis-related competencies.
NEW QUESTION # 75
Which of the following conditions is a reason for specimen rejection?
Answer: D
Explanation:
A clotted lavender-top specimen is a reason for specimen rejection. Lavender-top tubes contain EDTA anticoagulant and are used for tests such as CBCs, which require anticoagulated whole blood. If the specimen clots, the cellular components are trapped in the clot, platelet counts can be falsely low, and automated hematology analysis becomes unreliable. Properly labeled specimens, correctly filled light-blue tubes, and specimens transported upright are acceptable practices, not rejection causes. A clotted lavender specimen usually results from failure to mix the tube properly immediately after collection, delayed inversion, underfilling or collection difficulty, or drawing blood slowly and allowing clotting to begin before the specimen contacts the additive. The correct prevention is to fill the tube to the required volume and gently invert it the recommended number of times immediately after collection. The phlebotomist should never shake the tube, because vigorous agitation can cause hemolysis. Reference topics: Processing Specimens; specimen rejection; EDTA tube mixing; clotted specimens; hematology testing.
NEW QUESTION # 76
A phlebotomist centrifuges a serum specimen before it has fully clotted. Which of the following is most likely to occur?
Answer: D
Explanation:
If a serum specimen is centrifuged before it has fully clotted, fibrin strands can form in the serum. These strands can interfere with testing instruments, cause sample aspiration problems, and lead to inaccurate results or specimen rejection. Serum specimens must be allowed to clot for the required time before centrifugation. Centrifugation does not increase specimen volume, neutralize additives, or sterilize blood. Blood specimens remain potentially infectious regardless of processing. This question tests the difference between serum and plasma. Serum is the liquid portion after clotting; plasma is the liquid portion of anticoagulated blood. If the phlebotomist rushes serum processing, the specimen may look separated but still contain fibrin. The correct workflow includes observing required clot time, balancing centrifuge tubes, using the correct speed and duration, and removing specimens promptly after centrifugation when required. Speed is not quality; specimen integrity is quality. Reference topics: Processing Specimens; clotting time; serum processing; centrifugation; fibrin formation.
NEW QUESTION # 77
A phlebotomist must recollect a blood sample after the initial sample was rejected by the laboratory. Which of the following factors might have caused the sample to be rejected?
Answer: B
Explanation:
An underfilled collection tube is a common reason for laboratory rejection because many tests require a specific blood-to-additive ratio. This is especially critical for coagulation specimens, where insufficient blood relative to anticoagulant can falsely prolong clotting results. Underfilling can also produce inadequate specimen volume for testing, repeat analysis, or instrument requirements. A hematoma at the puncture site is a patient complication and may indicate procedural difficulty, but it does not automatically require specimen rejection unless it affected specimen quality. Use of a multiple-sample needle is a standard venipuncture method and is not a rejection criterion by itself. The cephalic vein is an acceptable antecubital vein when selected appropriately, so using it does not invalidate the specimen. Processing accuracy begins at collection: correct tube, correct volume, correct mixing, correct labeling, and correct transport. The NHA CPT outline identifies preanalytical errors, minimum and maximum volume requirements, fill levels and ratios, maintaining specimen integrity, and recollection as core processing and collection competencies. Reference topics: Processing Specimens; preanalytical errors; tube fill level; specimen rejection and recollection.
NEW QUESTION # 78
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