Certified Phlebotomy Technician (CPT) Quiz: Special Screening Collection
10 questions · exam conditions
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Special Screening CollectionQuestion 1 of 10

A newborn screening collection is being performed on an infant in the NICU who has been receiving total parenteral nutrition containing amino acid supplements for 72 hours. The infant has not received any enteral feeds. How might this affect the screening results and collection approach?

Proceed normally as parenteral amino acids provide adequate substrate for accurate screening of all metabolic disorders
Collect the specimen but expect potential false positives for amino acid disorders due to exogenous amino acid administration
Delay collection until enteral feeds are started as parenteral nutrition invalidates all metabolic screening tests
Collect specimen with documentation of TPN status, recognizing possible false negatives for some disorders and false positives for others
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Certified Phlebotomy Technician (CPT) Quiz

Certified Phlebotomy Technician (CPT) Quiz: Special Screening Collection

Practice Special Screening Collection in Certified Phlebotomy Technician (CPT) with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Special Screening Collection, giving you a quick way to practice the rules, question types, and explanations that matter most for Certified Phlebotomy Technician (CPT).

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

A newborn screening collection is being performed on an infant in the NICU who has been receiving total parenteral nutrition containing amino acid supplements for 72 hours. The infant has not received any enteral feeds. How might this affect the screening results and collection approach?

  1. Proceed normally as parenteral amino acids provide adequate substrate for accurate screening of all metabolic disorders
  2. Collect the specimen but expect potential false positives for amino acid disorders due to exogenous amino acid administration
  3. Delay collection until enteral feeds are started as parenteral nutrition invalidates all metabolic screening tests
  4. Collect specimen with documentation of TPN status, recognizing possible false negatives for some disorders and false positives for others (correct answer)
Explanation: Total parenteral nutrition can significantly affect metabolic screening results in complex ways - potentially masking some disorders (false negatives) while creating elevated levels of others (false positives). Collection should proceed with careful documentation so results can be properly interpreted. Choice A oversimplifies the complex effects. Choice B only considers false positives. Choice C unnecessarily delays screening when documentation allows proper interpretation.

Question 2

You are preparing to collect a newborn screening specimen when you discover the filter paper has been stored in a humid environment and feels slightly damp. The paper appears structurally intact with no visible mold or discoloration. No other filter papers are immediately available. What is the most appropriate action?

  1. Proceed with collection since the paper appears structurally sound and humidity alone does not invalidate the collection
  2. Allow the filter paper to air dry completely in a clean environment before proceeding with the collection
  3. Use a hair dryer or heat source to quickly dry the filter paper before beginning the collection procedure
  4. Obtain a new, properly stored filter paper before proceeding, even if this causes collection delays (correct answer)
Explanation: Humid storage can compromise filter paper integrity and affect blood absorption and analytical results, even if not visibly apparent. A new, properly stored filter paper should be obtained to ensure specimen quality. Choice A risks compromised results. Choice B may not restore proper paper characteristics. Choice C could damage the paper or introduce contaminants from the heat source.

Question 3

A 3-day-old newborn requires PKU screening, but the infant has been exclusively breastfeeding and has consumed minimal amounts due to maternal feeding difficulties. The nursing staff requests the collection be performed before discharge. What is the most appropriate action regarding the timing and validity of this collection?

  1. Proceed with collection as scheduled since the 72-hour minimum age requirement has been met, regardless of feeding status
  2. Delay collection until adequate protein intake is confirmed and document the reason for delayed screening on the filter paper (correct answer)
  3. Collect the specimen as requested but clearly mark it as potentially invalid due to insufficient protein intake
  4. Refuse collection and advise rescheduling for 2-3 days post-discharge when feeding patterns are more established
Explanation: PKU screening requires both adequate age (minimum 24-48 hours) AND adequate protein intake (typically 24-48 hours of normal feeding) to ensure phenylalanine levels will be detectable if the disorder is present. The collection should be delayed until proper feeding is established, and this delay must be documented. Choice A ignores the protein intake requirement. Choice C creates confusion about specimen validity. Choice D is incorrect as the delay should only be until feeding is adequate, not necessarily 2-3 days.

Question 4

While collecting a newborn screening specimen, you accidentally touch the filter paper circle with your gloved finger before applying the blood drop. The glove is clean but has traces of powder. The blood drop is ready to be applied. What is the most appropriate action?

  1. Apply the blood drop to the touched area since glove powder will not interfere with most metabolic assays
  2. Use a different circle on the same filter paper to avoid any potential contamination from the glove contact
  3. Clean the touched area with alcohol and allow it to dry completely before applying the blood drop
  4. Discard the filter paper and obtain a new one to ensure specimen integrity and avoid potential interference (correct answer)
Explanation: Filter paper contamination, including from glove powder, can interfere with analytical methods and compromise results. A new, uncontaminated filter paper should be used to ensure specimen integrity. Choice A assumes no interference when powder can affect assays. Choice B risks cross-contamination on the same paper. Choice C is inappropriate as alcohol can damage filter paper and affect absorption properties.

Question 5

A premature infant born at 32 weeks gestation is now 5 days old chronologically but has a corrected gestational age of 33 weeks and 5 days. The infant has been receiving parenteral nutrition and minimal enteral feeds. When should the initial newborn screening collection be performed?

  1. Immediately, since the chronological age of 5 days exceeds the minimum requirements for all screening tests
  2. At 7-10 days of age with a follow-up collection recommended due to prematurity and nutritional status (correct answer)
  3. When the infant reaches 36 weeks corrected gestational age to ensure metabolic maturity
  4. After transitioning to full enteral feeds regardless of age to ensure adequate substrate availability
Explanation: Premature infants require modified screening protocols due to physiological immaturity and altered nutritional status. The initial screen should be collected at 7-10 days with follow-up screening typically recommended. This accounts for delayed enzyme maturation and nutritional factors that may affect results. Choice A ignores prematurity considerations. Choice C unnecessarily delays screening. Choice D focuses only on nutrition while ignoring age-related factors.

Question 6

During a PKU collection, the first blood drop penetrates the filter paper adequately but appears pale and watery compared to normal blood. The infant appears well-hydrated with normal vital signs. The remaining collection circles need to be filled. What is the most likely explanation and appropriate response?

  1. This indicates capillary blood dilution; improve circulation with warming and gentle massage before continuing collection (correct answer)
  2. The infant is experiencing hemolysis; continue collection but document the specimen quality concern for laboratory review
  3. The filter paper may be defective; continue with remaining circles to assess if the issue persists across multiple spots
  4. This suggests inadequate heel puncture depth; make a new puncture site to obtain better quality blood flow
Explanation: PKU collection requires high-quality capillary blood samples, and recognizing blood quality issues is crucial for accurate screening results. When you encounter pale, watery blood during collection, you're likely seeing capillary blood that's been diluted with interstitial fluid. The correct response is A - this indicates capillary blood dilution, requiring improved circulation through warming and gentle massage before continuing. Pale, watery blood typically results from poor capillary circulation, causing interstitial fluid to mix with the blood sample. Warming the heel increases blood flow, while gentle massage helps promote better circulation and reduces fluid dilution. This technique will produce the rich, red blood needed for accurate PKU testing. B is incorrect because hemolysis would cause the blood to appear darker red or reddish-brown, not pale and watery. Hemolysis involves red blood cell breakdown, creating a different visual appearance than diluted blood. C misidentifies the problem as equipment failure. Defective filter paper would affect absorption patterns or cause bleeding through the paper, not change the blood's color and consistency. D incorrectly assumes inadequate puncture depth. However, if blood is flowing adequately to penetrate the filter paper, the puncture depth is sufficient. The issue is blood quality, not quantity or flow rate. Study tip: Remember that pale, watery capillary blood indicates dilution with interstitial fluid - always improve circulation first before making additional punctures. This conserves collection sites and reduces infant discomfort while ensuring specimen quality.

Question 7

During a newborn screening collection for metabolic disorders, you notice the filter paper becomes oversaturated with the first drop of blood, creating a large spot that bleeds through multiple layers. The infant's heel is still bleeding well. What is the most appropriate next step?

  1. Continue using the same filter paper and apply subsequent drops to different circles to complete the collection
  2. Allow the oversaturated spot to air dry completely, then apply additional drops to the same circle to ensure adequate volume
  3. Discard the contaminated filter paper and restart the collection with a new filter paper using smaller drops (correct answer)
  4. Complete the collection on the current filter paper but document the oversaturation issue for laboratory consideration
Explanation: Oversaturated filter paper that bleeds through multiple layers compromises the specimen integrity and can lead to inaccurate results. The collection should be restarted with fresh filter paper, using smaller drops to prevent oversaturation. Choice A risks contaminating other circles. Choice B compounds the oversaturation problem. Choice D continues with a compromised specimen that may yield unreliable results.

Question 8

A newborn screening collection is being performed on an infant who received a blood transfusion 6 hours prior due to severe anemia. The nursing staff indicates this may be the only opportunity for collection before transfer to another facility. How should this situation be handled?

  1. Proceed with collection since 6 hours is sufficient time for the infant's metabolism to normalize post-transfusion
  2. Collect the specimen but clearly document the transfusion history and timing on the filter paper and requisition (correct answer)
  3. Delay collection for 48-72 hours post-transfusion to ensure donor blood does not affect results
  4. Perform collection only for disorders unaffected by transfusion and defer remaining tests until later
Explanation: Recent blood transfusion can significantly affect newborn screening results by introducing donor blood components. The collection should proceed due to transfer timing, but the transfusion must be clearly documented so the laboratory can interpret results appropriately and determine if repeat testing is needed. Choice A incorrectly assumes rapid normalization. Choice C is ideal but impractical given transfer constraints. Choice D is not feasible as most screening is performed as a panel.

Question 9

During a routine newborn screening collection, the infant's heel puncture produces blood flow that stops after filling two circles. Despite warming and gentle massage, adequate flow cannot be reestablished. The infant appears stable with normal perfusion. What is the most appropriate next step?

  1. Submit the partial specimen with documentation, as two circles may provide sufficient sample for priority testing
  2. Make an additional puncture on the same heel using a deeper lancet to reestablish adequate blood flow
  3. Switch to the opposite heel and make a new puncture site to complete the remaining collection circles (correct answer)
  4. Wait 30 minutes for the original site to recover, then attempt to reactivate bleeding with additional warming
Explanation: When blood flow cannot be reestablished at the original site despite appropriate measures, a new puncture should be made on the opposite heel to complete the collection. This ensures adequate specimen for all required tests while minimizing trauma. Choice A provides insufficient specimen. Choice B risks excessive trauma to one site. Choice D unnecessarily delays collection when an alternative site is available.

Question 10

A newborn screening filter paper collection is completed, and all five circles are adequately filled. However, you notice that one circle has a small air bubble trapped in the center of the blood spot. The laboratory requires all five specimens for the complete panel. What action should be taken?

  1. Submit the specimen as collected since four of five circles are acceptable and the panel can be completed
  2. Gently press the air bubble area to redistribute the blood and eliminate the trapped air
  3. Add an additional drop of blood to the affected circle to cover the air bubble area (correct answer)
  4. Recollect the entire specimen using a new filter paper to ensure all circles meet quality standards
Explanation: A small air bubble can be corrected by adding another drop of blood to ensure the entire circle is adequately filled, as long as the paper can absorb additional blood without oversaturation. This preserves the existing good specimens while correcting the deficient one. Choice A submits a suboptimal specimen unnecessarily. Choice B risks damaging the filter paper. Choice D wastes a largely acceptable specimen when correction is possible.