DNP 604 Module 2 Lead Exposure Case Study Example

Reviewed by Ingrid Vasterling, MSN, RN Arizona State University Updated October 2026

This DNP 604 Module 2 sample is the lead case study in Advanced Human Pathophysiology Across Lifespan at ASU, given in essay format with the opening module on cellular injury and the cellular environment. ASU DNP 604 asks students in the Doctor of Nursing Practice to answer case questions using recent journal evidence rather than reference websites. The composite case is a two-year-old in Phoenix whose routine screening shows a blood lead level of 18 micrograms per deciliter, traced to a traditional powder given for teething. The answers explain how lead is absorbed and stored, how it disrupts heme synthesis and the developing brain, why iron deficiency worsens it, which findings to expect, and what the 2021 reference value means for follow-up.

CourseDNP 604 Advanced Human Pathophysiology Across Lifespan
ModuleModule 2
Paper typePathophysiology case study, essay answers
LengthAbout 637 words, 5 pages
FormatAPA 7 student paper
SchoolArizona State University
ProgramDNP
UpdatedOctober 2026

Free sample paper for DNP 604 Module 2

1

A Powder for Teething and a Level of 18: A Lead Exposure Case Study in Cellular Injury

Student Name

Edson College of Nursing and Health Innovation, Arizona State University

DNP 604: Advanced Human Pathophysiology Across Lifespan

Instructor Name

Month Day, Year

What this page is doingThe title places the source of exposure and the blood lead level first, the two facts that drive the case, and names its focus on cellular injury.
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A Powder for Teething and a Level of 18: A Lead Exposure Case Study in Cellular Injury

The Case

Mateo, 2 years old, has a blood lead level of 18 micrograms per deciliter (µg/dL) on routine screening at a Phoenix clinic, confirmed by venous sample. His mother reports that he is irritable, eats poorly and has had constipation. His speech is slightly behind his older sister's at the same age. They live in a house built in 2005. On questioning, his grandmother has been giving him a bright orange powder, a traditional remedy, for teething and stomach upset. Hemoglobin is 10.4 g/dL with a low mean corpuscular volume, and ferritin is low.

Question 1: How is lead absorbed and distributed?

Lead enters mainly by ingestion, and young children absorb a much larger fraction of ingested lead than adults. Absorption increases when the diet is low in iron and calcium, because lead uses some of the same transport pathways in the gut. Once absorbed, lead travels in red blood cells, distributes to soft tissues including the brain, and accumulates in bone, which can release it for years. The blood lead level reflects recent exposure. Some traditional remedies used for digestive complaints contain very high amounts of lead, which fits this case.

Question 2: How does lead injure cells?

Lead harms cells mainly by mimicking and displacing essential metals, especially calcium and zinc, and by generating oxidative stress. In heme synthesis, lead inhibits delta-aminolevulinic acid dehydratase and ferrochelatase, reducing heme production and contributing to anemia. In the nervous system, lead interferes with calcium-dependent neurotransmitter release, disrupts synapse formation and pruning, and affects the developing blood-brain barrier. Because the young brain is building connections rapidly, injury during this period can have lasting effects on cognition and behavior; a review of 77 cohort studies published since 2022 found consistent links between childhood lead exposure and poorer cognitive, motor, behavioral and mental health outcomes (Dewey & Soomro, 2025). According to CDC, children have no known safe blood lead level (Ruckart et al., 2021).

Question 3: Why does iron deficiency matter?

Iron deficiency and lead exposure reinforce each other. Iron deficiency increases lead absorption, and both impair neurodevelopment. A review of metal exposure and child development found evidence that iron status may modify the neurodevelopmental effects of lead and other metals (Schildroth et al., 2022). Mateo's microcytic anemia and low ferritin suggest iron deficiency in addition to lead's effect on heme synthesis.

Question 4: Which findings fit lead exposure?

Irritability, poor appetite, constipation and abdominal discomfort are common gastrointestinal and behavioral signs at moderate levels. His mild speech delay may reflect early neurodevelopmental effects, though other causes must be considered. Anemia reflects both iron deficiency and impaired heme synthesis. Very high levels can cause encephalopathy with vomiting, seizures and altered consciousness, which he does not have.

Question 5: What does his level mean, and what should happen next?

In 2021, CDC lowered the blood lead reference value from 5 to 3.5 µg/dL, based on the 97.5th percentile of levels in U.S. children aged 1 to 5, to identify children with more exposure than most (Ruckart et al., 2021). Mateo's level of 18 is well above it. Priorities are to stop exposure, which means identifying and removing the powder and reporting to the health department for an environmental investigation; treating iron deficiency; ensuring good nutrition with calcium and iron; repeating blood lead testing on schedule; and referring for developmental assessment. Chelation is generally reserved for much higher levels, and removing the source is the most effective treatment at this level. Siblings and other children in the home should be tested.

Question 6: What are the advanced practice implications?

Clinicians should ask about traditional remedies, imported spices and cosmetics in every lead assessment, using culturally respectful language, since families may not consider these products medicines.

References

Dewey, D., & Soomro, M. H. (2025). Prenatal and childhood exposures to heavy metals and their associations with child cognition, motor skills, behaviour and mental health. Essays in Biochemistry, 69(3), 199-240. https://doi.org/10.1042/EBC20253010

Ruckart, P. Z., Jones, R. L., Courtney, J. G., LeBlanc, T. T., Jackson, W., Karwowski, M. P., Cheng, P.-Y., Allwood, P., Svendsen, E. R., & Breysse, P. N. (2021). Update of the blood lead reference value: United States, 2021. MMWR: Morbidity and Mortality Weekly Report, 70(43), 1509-1512. https://doi.org/10.15585/mmwr.mm7043a4

Schildroth, S., Kordas, K., Bauer, J. A., Wright, R. O., & Claus Henn, B. (2022). Environmental metal exposure, neurodevelopment, and the role of iron status: A review. Current Environmental Health Reports, 9(4), 758-787. https://doi.org/10.1007/s40572-022-00378-0

Reading the DNP 604 Module 2 assignment instructions

The posted syllabus assigns the Lead case study in Week 1 along with the hypernatremia case, both tied to the module on the cell and its environment. These cases arrive as essay exams in Canvas and, with the later neurological and genetics cases are worth 45 points. Sources follow the same rule as the other cases: the textbook and recent peer-reviewed articles, cited in APA. Expect questions on exposure, cellular mechanisms, findings and management. Read the case carefully for exposure clues before answering. Because it is assigned with the hypernatremia case in the first week, students often find it helpful to review cellular injury mechanisms before answering both. Reading the chapters on cellular injury first makes this case faster to answer.

How the DNP 604 Module 2 example is put together

The sample gives a short composite case with the history and laboratory clues the questions rely on, including a cultural exposure source. Six answers follow in order, each opening with the main point. Cellular mechanisms are explained at the enzyme and synapse level, then linked to findings. The interaction with iron deficiency is supported by a recent review. The management answer explains the 2021 reference value and orders priorities from removing the source to follow-up testing. Recent peer-reviewed sources meet the course's evidence rules. Cultural context is treated respectfully, which matters for real clinical conversations. Each answer begins with a one-sentence claim, then explains the mechanism behind it in plain terms.

Reading the DNP 604 Module 2 grading rubric

Pathophysiology case studies are generally graded on accurate mechanisms, logical connections between mechanism and clinical findings, appropriate management reasoning, and correct use of recent, peer-reviewed sources in APA. Faculty look for answers that explain lead's effects at the cellular level, such as enzyme inhibition and calcium mimicry, rather than listing symptoms. Recognizing interactions, such as iron deficiency, shows integrated thinking. Correctly stating current reference values demonstrates attention to recent evidence. Answers that order management steps by priority, beginning with removing the source, show the clinical judgment expected of advanced practice students. Correct current values earn credit. Explaining the interaction with iron deficiency shows integrated reasoning. Clear headings speed grading.

DNP 604 Module 2 help with common mistakes

The most common weakness is listing symptoms of lead poisoning without explaining mechanisms. Tie each finding to a cellular effect. Another mistake is citing the old reference value of 5 µg/dL; check the 2021 update. Remember that removing the source comes first. Ask about cultural products respectfully. Stick to recent peer-reviewed sources. If you would like help with a case study for this course, bring it to the desk. Read the case for every exposure clue, including home age, hobbies, remedies, spices and caregivers' occupations, before answering. Cite current CDC values. Use the course text for heme synthesis and recent articles for current guidance.

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DNP 604 Module 2 questions, answered

Where can I find a free DNP 604 Module 2 sample paper?

The lead case study is above in full: a two-year-old with a blood lead level of 18 from a traditional remedy, absorption, cellular injury, iron deficiency, findings and follow-up, with recent references.

What is the current CDC blood lead reference value?

In 2021, CDC lowered it to 3.5 µg/dL, based on the 97.5th percentile of U.S. children aged 1 to 5.

How does lead damage the developing brain?

It mimics calcium and zinc, disrupts neurotransmitter release and synapse development, and causes oxidative stress during a period of rapid brain growth.

Why does iron deficiency increase lead risk?

Iron deficiency increases lead absorption from the gut, and both conditions impair neurodevelopment.

What is the first step in managing elevated blood lead in a child?

Identify and remove the source of exposure, usually with a public health environmental investigation.