Seven causes of one woman's right lower quadrant pain, ranked by likelihood, by danger and by workup order, with ectopic pregnancy tested first although appendicitis is judged the likelier. Searches like "nu 552 unit 6 assignment example", "nu552 unit 6 sample" and "nu552 unit 6 example" land here.
Seven Candidates, Three Rankings: A Ranked Differential for Right Lower Quadrant Pain in a 26-Year-Old With a Late Period
[Student Name]
Purdue University Global
NU552: Advanced Health Assessment and Diagnostic Reasoning
Unit 6 Assignment
[Instructor Name]
[Date]
The patient is a composite built for the assignment; no real patient is described.
Three Rankings, Not One
A differential ranked only by likelihood tells us what is probably happening. A differential ranked only by danger tells us what would cost the most if missed. Neither tells us what to do first. The action order is where likelihood and danger meet the speed and cost of the test that would settle each candidate. This paper ranks seven candidates all three ways and explains each placement from this patient's own history and examination.
The Presentation
Ms. [A.], 26, a graduate student, has had pain in her right lower abdomen for 18 hours. It began as a vague ache around her navel the previous evening and, by morning, had settled in the right lower quadrant, where it is now constant and worse with walking and coughing. She has felt nauseated and has not wanted to eat since last night. Her last menstrual period began six weeks ago; her cycles are usually regular at 28 days. She is sexually active with one partner and uses condoms inconsistently. She has no urinary burning, no vaginal discharge and no history of kidney stones.
Temperature [37.8] C, heart rate [96], blood pressure [118/74]. She is tender in the right lower quadrant, with guarding and pain on releasing pressure. There is no flank tenderness. A pelvic examination shows mild right adnexal tenderness without cervical motion tenderness.
The Ranked Table
1. Appendicitis. For: periumbilical pain that later settled on the right, anorexia, low-grade fever, guarding and rebound tenderness. Against: a late period points elsewhere. Likelihood 1, danger 3, action 2. Decisive result: imaging showing an inflamed appendix.
2. Ectopic pregnancy. For: a late period, inconsistent contraception, right-sided pain, adnexal tenderness. Against: stable vital signs, no vaginal bleeding. Likelihood 2, danger 1, action 1. Decisive result: a positive pregnancy test, then no intrauterine pregnancy on ultrasound.
3. Ovarian torsion. For: unilateral lower quadrant pain, nausea, adnexal tenderness. Against: onset was gradual, not sudden, and pain began centrally. Likelihood 5, danger 2, action 3. Decisive result: pelvic ultrasound with Doppler showing an enlarged ovary with abnormal flow.
4. Ruptured or hemorrhagic ovarian cyst. For: unilateral pain, adnexal tenderness. Against: gradual onset, low-grade fever. Likelihood 3, danger 4, action 4. Decisive result: pelvic ultrasound showing a complex cyst and free fluid.
5. Pelvic inflammatory disease. For: sexually active, inconsistent condom use, fever. Against: no cervical motion tenderness, no discharge, unilateral pain. Likelihood 4, danger 5, action 5. Decisive result: cervical motion tenderness on a repeat examination, or a positive nucleic acid test for gonorrhea or chlamydia.
6. Ureteral stone. For: right lower quadrant pain can come from a distal stone. Against: steady rather than colicky pain, no flank tenderness, no hematuria history. Likelihood 6, danger 6, action 6. Decisive result: blood on urinalysis, then imaging.
7. Pyelonephritis. For: fever. Against: no urinary symptoms, no flank tenderness. Likelihood 7, danger 7, action 7. Decisive result: pyuria and bacteriuria on urinalysis.
Why Each Candidate Sits Where It Does
Appendicitis ranks first on likelihood because her story follows its classic course: pain beginning around the navel, when the inflamed appendix stimulates visceral nerves that cannot localize, and then migrating to the right lower quadrant as inflammation reaches the parietal peritoneum. Migration of pain, peritoneal signs and raised inflammatory markers are among the stronger clinical predictors of appendicitis (Andersson, 2004). It ranks third on danger because, although perforation is serious, the harm develops over hours rather than minutes.
Ectopic pregnancy ranks second on likelihood but first on danger and first on action. A woman of reproductive age with abdominal pain and a late period has an ectopic pregnancy until proved otherwise, because rupture can cause life-threatening hemorrhage (Barnhart, 2009). Her stable vital signs are reassuring but do not exclude it; young women can maintain their blood pressure until they have lost a great deal of blood. It is first on action because a urine pregnancy test, available in minutes at the bedside and costing almost nothing, answers its first question.
Ovarian torsion ranks low on likelihood because its typical onset is sudden, often with vomiting, and her pain began gradually and centrally. It ranks second on danger because a twisted ovary loses its blood supply and can be lost within hours. It is third on action because pelvic ultrasound, which she will likely need anyway, can assess the ovaries and their blood flow at the same time.
A hemorrhagic or ruptured ovarian cyst ranks third on likelihood and fourth on danger. Most are self-limiting, but a large bleed can cause significant blood loss. The same pelvic ultrasound evaluates it.
Pelvic inflammatory disease stays on the list because she is sexually active with inconsistent condom use and has a fever. Without cervical motion tenderness, discharge or bilateral tenderness, it is less likely. It ranks fifth on danger because, although it can lead to abscess and later infertility, it does not threaten her life in the next hour.
The ureteral stone stays on the list because a stone lodged near the bladder can cause right lower quadrant pain. It is argued down by steady rather than colicky pain and no flank tenderness, but it is not removed. Pyelonephritis ranks last, lacking urinary symptoms and flank tenderness.
The Action Order
1. Urine pregnancy test, now.
2. Urinalysis, from the same sample.
3. Blood count and, if the pregnancy test is positive, a quantitative beta-hCG and blood type.
4. Imaging, chosen by the pregnancy result.
The first step settles the first question in minutes. The second adds almost no cost and addresses the stone and pyelonephritis. The imaging choice follows from the pregnancy test.
How a Positive Pregnancy Test Would Reorder Everything
If her pregnancy test is positive, the question becomes where the pregnancy is. Transvaginal ultrasound becomes the next step. An intrauterine pregnancy would make an ectopic pregnancy very unlikely, though not impossible, and appendicitis would return to the front. No intrauterine pregnancy, with a beta-hCG above the level at which one should be visible, would make ectopic pregnancy the working diagnosis and call for urgent gynecologic consultation (American College of Obstetricians and Gynecologists [ACOG], 2018). If appendicitis still needs imaging in a pregnant woman, ultrasound or magnetic resonance imaging would be preferred over computed tomography to limit radiation to the fetus.
If the test is negative, ectopic pregnancy drops off the list. Appendicitis leads on both likelihood and action, and imaging of the appendix, with a look at the ovaries, is the next step.
References
American College of Obstetricians and Gynecologists. (2018). ACOG Practice Bulletin No. 193: Tubal ectopic pregnancy. Obstetrics & Gynecology, 131(3), e91-e103. https://doi.org/10.1097/AOG.0000000000002560
Andersson, R. E. B. (2004). Meta-analysis of the clinical and laboratory diagnosis of appendicitis. British Journal of Surgery, 91(1), 28-37. https://doi.org/10.1002/bjs.4464
Barnhart, K. T. (2009). Ectopic pregnancy. New England Journal of Medicine, 361(4), 379-387. https://doi.org/10.1056/NEJMcp0810384
How this NU552 Unit 6 example is structured
Three separate rankings are the organizing idea, stated in the first paragraph: likelihood describes what is probably happening, danger describes what would cost most if missed, and the action order is where the two meet with the speed and cost of each test. Every placement has a stated basis. Findings for and against come from this patient's history and exam rather than from textbook frequencies. The one-result column forces each candidate to name its decisive test, which exposes any candidate with no practical way to be tested. Rows with low likelihood are not removed; the ureteral stone stays, argued down by steady rather than colicky pain and no flank tenderness. The final paragraph describes how a positive pregnancy test would reorder everything, making the location of the pregnancy the next question.
Get an NU552 Unit 6 example written to your instructions
The NU552 Unit 6 case can arrive complete or deliberately partial; either works, sent with its rubric. The first differential costs nothing, follows your instructions, and lands in 24-48h, candidates ordered on two scales, probability and harm, each placement argued from the case's own findings, plus a closing word on what would reorder the list. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
NU552 Unit 6 questions, answered
Must the differential separate likelihood from danger?
Not every rubric says so explicitly, but it strengthens nearly every ranked differential. A single ranking hides whether a dangerous condition was placed high because it is likely or because it is serious. The sample keeps both and adds an action order, which is where the two considerations meet in practice.
How many candidates should a ranked differential hold?
Enough to include every plausible cause and every dangerous one the presentation raises, often five to eight. The sample uses seven. Fewer risks omitting a must-exclude diagnosis; many more usually means low-value candidates padding the list. Each entry should have at least one supporting finding from the case.
How is a deliberately incomplete case ranked?
Rank what the available findings support and say what missing information would change. Many Unit 6 cases withhold something on purpose. The sample's decisive result column serves that purpose well, since it names the test or question that would fill each gap and shows how the ranking would respond.