| Course | NR 603 Advanced Clinical Diagnosis and Practice across the Lifespan Practicum |
|---|---|
| Week | 4 |
| Paper type | Diagnostic reasoning write-up |
| Length | About 1,110 words, 4 pages |
| Format | APA 7 student paper |
| School | Chamberlain University |
| Program | MSN, Family Nurse Practitioner (FNP) |
| Updated | October 2026 |
Free sample paper for NR 603 Week 4
Diagnostic Reasoning Write-Up: From Seven Possibilities to One for R.M.'s Fatigue and Weight Loss, Each Elimination Backed by a Finding and a Condition for Reopening
Student Name
College of Nursing, Chamberlain University
NR 603: Advanced Clinical Diagnosis and Practice across the Lifespan Practicum
Instructor Name
Month Day, Year
Diagnostic Reasoning Write-Up: From Seven Possibilities to One for R.M.'s Fatigue and Weight Loss, Each Elimination Backed by a Finding and a Condition for Reopening
The Case, Compressed
A 58-year-old with three months of fatigue, breathlessness on stairs, 5% unintended weight loss, slightly looser stools, a year of daily ibuprofen and no colon screening. Pale, heart rate 96. Hemoglobin 10.2, mean cell volume 74, ferritin 8.
The List Before Any Testing
At the first visit, seven possibilities were open:
1. Iron deficiency anemia from gut blood loss
2. Overactive thyroid
3. New diabetes
4. Depression
5. Hidden infection, including hepatitis C or HIV
6. Heart failure
7. A cancer causing weight loss through means other than blood loss
Eliminations With Their Evidence
Overactive thyroid: removed by a thyroid-stimulating hormone of 2.1, in the normal range. A normal level makes overactive thyroid very unlikely.
New diabetes: removed by a hemoglobin A1c of 5.6%, below the diabetic threshold of 6.5%.
Depression: moved well down by a PHQ-9 score of 4, below the threshold of 10 that suggests moderate depression, and by findings depression cannot explain: pallor, a fast resting heart rate and a low hemoglobin. Not formally excluded; depression can coexist with other illness.
Hidden infection: hepatitis C and HIV antibodies negative. No fever or night sweats.
Heart failure: no swelling, no crackles, no raised neck veins and normal blood pressure. The breathlessness is explained by the anemia.
A cancer causing weight loss in other ways: not removed. It is the reason the next step is endoscopy rather than iron alone. The finding that keeps it open is the weight loss, which iron deficiency does not usually cause by itself.
The Survivor, Argued Positively
Iron deficiency anemia: hemoglobin 10.2, small red cells, ferritin 8 and transferrin saturation 6%. A ferritin below 15 is close to diagnostic of iron deficiency, and in an adult it points to blood loss until shown otherwise. The source is the open question, and two candidates explain it:
Upper gut blood loss from an ulcer caused by daily ibuprofen. Supporting: a year of daily use. Against: no indigestion, no black stools; but ulcers from anti-inflammatory medicines are often painless.
Lower gut blood loss from a colon polyp or cancer. Supporting: age, no screening, looser stools, weight loss. Against: nothing in the history argues against it.
Malabsorption from celiac disease remains possible, with the antibody test pending.
Ko et al. (2020) recommend both upper and lower endoscopy in adults with iron deficiency anemia, because a lesion in one place does not exclude one in the other, and an ulcer found in the stomach does not mean the colon is clear.
Why the Dangerous Candidate Stays
Colorectal cancer cannot be removed on probability. A 58-year-old with iron deficiency anemia and weight loss has a meaningfully raised risk of colorectal cancer compared with the general population, and screening has never been done (US Preventive Services Task Force, 2021). The only finding that could remove it is a normal colonoscopy.
What Would Reopen a Dropped Candidate
Overactive thyroid: if weight loss continues and a fast heart rate persists after the anemia is corrected, the thyroid test should be repeated, since a single result can be affected by illness.
Depression: if the fatigue persists after hemoglobin recovers and the endoscopies find a cause and it is treated, depression should be assessed again in depth.
A cancer elsewhere: if endoscopies are normal and the weight loss continues, imaging of the chest, abdomen and pelvis would follow.
What the Reasoning Avoided
The most tempting error was to call it iron deficiency from a vegetarian diet and stop with iron tablets. Diet can lower iron intake, but a ferritin of 8 with weight loss at 58 needs a source found. Croskerry (2003) lists premature closure, settling on an answer before it is confirmed, among the errors clinicians make most; naming the diet would have been exactly that.
How the Order of Testing Was Chosen
The first visit's tests were chosen to answer several questions at once from one blood draw: the blood count and iron studies for the leading candidate, the thyroid test and A1c for the next two, and the infection tests because they were due anyway. Endoscopy was not ordered at the first visit, because without a blood count there was no reason yet to examine the gut; the blood count turned a possibility into an indication. This order kept the patient from an invasive test that might not have been needed while losing only a week.
The Role of Each Result
Some results removed candidates; others narrowed the survivor. The low mean cell volume and ferritin did not only confirm anemia; they said what kind, which pointed to iron loss rather than, for example, a vitamin deficiency or a chronic disease. A normal-sized red cell anemia would have sent the reasoning in a different direction, toward kidney disease, bone marrow problems or chronic inflammation. The raised platelet count, a common reaction to iron deficiency, fitted the same picture.
Where Reasoning and Probability Part
On probability alone, the most likely source in a person taking daily ibuprofen is the stomach. If the reasoning had stopped there, an upper endoscopy finding an ulcer would have seemed to close the case. The guideline recommends looking at both ends precisely because a stomach ulcer and a colon lesion can coexist, and the more dangerous one may be the less likely (Ko et al., 2020).
What the Patient Contributed
R.M.'s own account narrowed the list as much as the tests did. The answer to "Have you noticed black stools?" was no, which made a fast upper gut bleed less likely. The answer to "Have you ever had a colonoscopy?" was no, which kept the colon firmly on the list. The answer to "What do you take for your back?" brought the ibuprofen into view. Each question was asked because a specific candidate depended on it.
Next Steps
Each step below is tied to a candidate that is still open or to the survivor's source, so that if a result comes back unexpected, it is clear which part of the reasoning it affects.
Urgent referral for bidirectional endoscopy; celiac antibodies; alternate-day iron; hemoglobin recheck at 4 weeks.
Limits
The write-up relies on single results for thyroid and A1c. The weight history rests on one earlier measurement.
References
Croskerry, P. (2003). The importance of cognitive errors in diagnosis and strategies to minimize them. Academic Medicine, 78(8), 775-780. https://doi.org/10.1097/00001888-200308000-00003
Ko, C. W., Siddique, S. M., Patel, A., Harris, A., Sultan, S., Altayar, O., & Falck-Ytter, Y. (2020). AGA clinical practice guidelines on the gastrointestinal evaluation of iron deficiency anemia. Gastroenterology, 159(3), 1085-1094. https://doi.org/10.1053/j.gastro.2020.06.046
US Preventive Services Task Force. (2021). Screening for colorectal cancer: US Preventive Services Task Force recommendation statement. JAMA, 325(19), 1965-1977. https://doi.org/10.1001/jama.2021.6238
The Chamberlain NR 603 Week 4 instructions
The Week 4 write-up is mostly about subtraction. Several possibilities were on the table at the start, and the finished paper explains, one at a time, what removed each one that went. The removal must be a finding, a timing, a negative test or an incompatible age, not a sense that it seemed unlikely. Argue for the survivor with positive evidence. State a condition under which a dropped candidate would come back. Most rubrics mark down elimination by assertion, a write-up that argues only for the winner and a dangerous candidate removed on probability rather than evidence. Include the list you started with, before any tests.
How the NR 603 Week 4 example is put together
The sample compresses the case to three sentences, then lists seven candidates from the first visit. Overactive thyroid, diabetes, infection and heart failure are each removed with a named result or finding; depression is moved down with reasons; a cancer elsewhere is kept open because weight loss is unexplained. The survivor, iron deficiency anemia, is argued from the blood count and iron studies, with two possible sources weighed. A section explains why colorectal cancer cannot be removed on probability. Re-entry conditions are set for three dropped candidates. Sections on test order, what each result contributed, where probability and reasoning part, and the premature closure avoided follow. Margin notes show where each elimination earns credit.
Reading the NR 603 Week 4 grading rubric
The biggest loss is elimination by assertion, and every removal here names the result that caused it. A write-up that argues only for the winner leaves the reader unsure whether others were considered, so all seven candidates are accounted for. Removing a dangerous candidate on probability loses a row, while colorectal cancer is kept until a colonoscopy can remove it. Missing re-entry conditions cost marks, and three are written. Naming the specific error avoided, calling it a diet problem, earns the reflection criterion. Explaining what each result contributed, not only what it removed, shows the survivor was argued. Naming where probability and reasoning part shows why both endoscopies were needed.
NR 603 Week 4 help: mistakes that cost points
Weak NR 603 Week 4 write-ups list several candidates and call them less likely without evidence. Others explain only why the final diagnosis is right. Many drop a serious possibility because it is uncommon. Few say what would bring a dropped candidate back. The original list is often not shown at all. Write out every candidate you started with, remove each with a finding, keep any dangerous one until evidence removes it and say what would reopen the rest. Argue for the survivor with positive findings. If your case differs, share your starting list and results, and we can prepare a sample write-up with you. Say which of your own results carried the most weight.
Get a NR 603 Week 4 example written to your instructions
Send the Week 4 instructions with whichever case your section set, and a custom example is written to those requirements and returned inside 24 to 48 hours. The first one is free. It shows how the argument is built; which candidate you keep is a call only you can defend.
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NR 603 Week 4 questions, answered
Is a diagnosis required by the end?
Most versions of this assignment want one, stated with its confidence. The distinction that earns marks is between a diagnosis and a certainty. Writing that this is the best explanation available on the findings so far, and naming what would change it, satisfies the requirement without claiming more than a single encounter can support.
How much detail does each elimination need?
A short paragraph is usually enough, but it has to contain a fact. The pattern that costs points is three sentences of description followed by a conclusion nothing in them supports. One specific finding, one line explaining why it is incompatible, and the elimination is done and defensible.
Can age alone remove a candidate?
Sometimes, and this course is partly about knowing when. Age shifts probability heavily and occasionally rules something out on physiology, but a dangerous condition that is merely rare in a given age group is not excluded by rarity. Papers that drop a serious possibility because the patient seemed too young for it lose points reliably.
Where can I find a free NR 603 Week 4 sample paper?
The full diagnostic reasoning write-up narrowing seven candidates to iron deficiency anemia is published on this page.
Why does colorectal cancer stay on the list in the NR 603 Week 4 write-up?
At 58, with iron deficiency, weight loss and no screening, only a normal colonoscopy can remove it; probability alone is not enough.