| Course | NR 547 Differential Diagnosis in Psychiatric-Mental Health across the Lifespan Practicum |
|---|---|
| Week | 6 |
| Paper type | Lifespan variation write-up |
| Length | About 1,120 words, 2 pages |
| Format | APA 7 student paper |
| School | Chamberlain University |
| Program | MSN, Psychiatric-Mental Health Nurse Practitioner (PMHNP) |
| Updated | September 2026 |
Free sample paper for NR 547 Week 6
Lifespan Variation Write-Up: Irritability at Seven, Seventeen and Seventy, and Why the Same Complaint Leads to Three Different Differentials
Student Name
College of Nursing, Chamberlain University
NR 547: Differential Diagnosis in Psychiatric-Mental Health Across the Lifespan
Instructor Name
Month Day, Year
Lifespan Variation Write-Up: Irritability at Seven, Seventeen and Seventy, and Why the Same Complaint Leads to Three Different Differentials
One Symptom, Held Constant
The symptom is irritability: a lowered threshold for anger or annoyance, shown as snapping, arguing, sulking or outbursts out of proportion to the trigger. It is one of the most common reasons families and clinicians raise concern about mood, and it appears in the criteria or descriptions of many different conditions. This write-up follows it through three ages, a 7-year-old, a 17-year-old and a 70-year-old, and shows how the same complaint calls for a different set of explanations at each. The course's case of the 24-year-old doctoral student, whose depressive episode included some irritability with lab colleagues, sits between the second and third of these and borrows from both.
At Seven
How it presents. In a young child, irritability rarely arrives as a complaint from the child. It appears as tantrums at bedtime, refusal to go to school, stomach aches on school mornings, fighting with siblings or a teacher's note about outbursts in class. The child may not have words for low mood at all.
Who is telling you. Parents and teachers, and they see different things. A parent sees evenings, mornings and weekends; a teacher sees structured tasks and peers. Parents may over-report when they are exhausted or under-report when they fear blame. Asking both, and asking the child directly using simple language or drawings, gives the fullest picture.
What competes. At this age, irritability can reflect a depressive disorder, since irritable mood can substitute for depressed mood in children and adolescents (American Psychiatric Association, 2022). It can also reflect attention-deficit/hyperactivity disorder, where frustration follows repeated failure; an anxiety disorder, where irritability arises when a feared situation is imposed; oppositional defiant disorder; disruptive mood dysregulation disorder, which requires severe, frequent outbursts and a persistently irritable mood between them, beginning before age 10; and an autism spectrum condition, where changes in routine or sensory overload provoke outbursts. Medical causes include poor sleep, hearing or vision problems that make school frustrating, and, rarely, neurological disease. Adverse experiences, including bullying and maltreatment, must be asked about.
What changes the reasoning. Pattern and setting matter most. Irritability confined to school suggests a learning or attention problem, or bullying. Irritability that is persistent across all settings, with severe outbursts several times a week, raises disruptive mood dysregulation disorder. Irritability with loss of interest, sleep change and withdrawal points toward depression. Guidelines for assessing depression in children stress gathering information from multiple informants and screening for other disorders that commonly co-occur (Birmaher et al., 2007).
At Seventeen
How it presents. In an adolescent, irritability is often the most visible sign of a mood problem, shown as arguments at home, withdrawal to the bedroom, falling grades and conflict with friends. Adolescents may report low mood directly if asked privately, but many do not volunteer it.
Who is telling you. The adolescent, parents and sometimes a school counselor. Interviewing the adolescent alone is essential, since sensitive topics, including substance use, sexual activity and self-harm, are unlikely to be disclosed in front of a parent.
What competes. Ordinary developmental moodiness is the first thing to distinguish, and the test is duration, pervasiveness and impairment. Beyond that, depressive disorders and anxiety disorders remain live. Substance use now enters the differential, since cannabis, alcohol and stimulants can each cause irritability during use or withdrawal. Bipolar disorder becomes a real consideration: onset commonly falls in late adolescence or early adulthood, and irritability with decreased need for sleep, increased energy or risk-taking should prompt specific questions about episodes. Eating disorders, trauma and emerging personality patterns also appear at this age.
What changes the reasoning. Episodic irritability, with distinct periods of change from the adolescent's usual self, raises mood disorders, including bipolar disorder. Irritability tied to substance use days raises a substance-related cause. The doctoral student in this course's case is a reminder that an elevated period in late adolescence or early adulthood may be remembered as a good week and not reported unless asked about specifically.
At Seventy
How it presents. In an older adult, irritability may be reported by a spouse or adult child as "not themselves," short-tempered, suspicious or withdrawn. The person may deny feeling low. Late-life depression often presents with fewer reports of sadness and more somatic complaints, apathy and cognitive difficulties (Alexopoulos, 2005).
Who is telling you. The patient, a spouse or adult child and the medical record. The record matters more at this age because medication lists and medical conditions carry much of the differential.
What competes. A first-ever psychiatric presentation at 70 should be treated as medical until shown otherwise. Delirium, which can present with irritability and agitation and fluctuates over hours, must be excluded first because it signals an acute medical problem and is frequently missed in older adults (Inouye, 2006). Dementia, especially frontotemporal and early Alzheimer disease, can begin with personality change and irritability. Pain, hearing loss, thyroid disease, vitamin B12 deficiency and sleep apnea are all plausible. Medications are a major cause, including corticosteroids, some antiparkinsonian drugs and those with anticholinergic effects. Depression remains common, as does alcohol misuse, which is easily overlooked in older adults.
What changes the reasoning. Acute onset over days, fluctuating attention and a new medical problem point to delirium. Gradual onset with memory or executive decline points to a neurocognitive disorder. Irritability with low mood, loss of interest and sleep change, with normal cognition, points to depression.
What the Comparison Shows
The complaint is identical across the three ages, and the criteria for most disorders are written the same way. What changes is the list of alternatives that are genuinely live, the people who can tell you about the problem and the first thing you have to exclude. At seven, the first question is often about development, learning and the child's environment. At seventeen, it is about substances and the first appearance of episodic mood disorders. At seventy, it is about medical illness, delirium and medications. A clinician who carries one differential across all three ages will miss the diagnosis that matters most at each.
The informant also changes. A child's irritability is reported by adults with their own perspectives; an adolescent's is best heard privately from the adolescent; an older adult's may be clearest to a spouse who has watched a gradual change. Each informant should be named in the assessment, since each sees part of the picture.
References
Alexopoulos, G. S. (2005). Depression in the elderly. The Lancet, 365(9475), 1961-1970. https://doi.org/10.1016/S0140-6736(05)66665-2
American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). https://doi.org/10.1176/appi.books.9780890425787
Birmaher, B., Brent, D., & AACAP Work Group on Quality Issues. (2007). Practice parameter for the assessment and treatment of children and adolescents with depressive disorders. Journal of the American Academy of Child & Adolescent Psychiatry, 46(11), 1503-1526. https://doi.org/10.1097/chi.0b013e318145ae1c
Inouye, S. K. (2006). Delirium in older persons. New England Journal of Medicine, 354(11), 1157-1165. https://doi.org/10.1056/NEJMra052321
Reading the NR 547 Week 6 instructions
This week asks you to examine how a symptom or disorder presents differently across the lifespan. Instructions commonly request the symptom, its presentation at different ages, developmental and medical considerations, differential diagnoses at each stage and implications for assessment. Define the symptom in age-neutral terms at the start and hold it constant. For each age band, describe concretely how it usually surfaces and who reports it, noting each informant's blind spots. List the alternatives that become live at that stage, including developmental, substance-related and medical causes. Say which features change your reasoning at each age. Close by comparing the three and drawing out what a clinician must do differently. Use age-specific guidelines and reviews, cited in APA 7.
How the NR 547 Week 6 example is put together
The write-up opens by defining irritability and linking it to the course's doctoral student case. The section on a 7-year-old describes tantrums, school refusal and stomach aches, parent and teacher informants, and a differential including depression, attention problems, anxiety, oppositional behavior, mood dysregulation and autism, with guideline support for multiple informants. The section on a 17-year-old covers private interviews, developmental moodiness, substances and the emergence of bipolar disorder. The section on a 70-year-old covers reports from family, late-life depression with fewer sadness complaints, delirium first, dementia, medical causes and medications. The comparison explains how the live alternatives, informants and first exclusions change with age. It also notes that the criteria text is the same at each age, so the difference lies in interpretation.
Where the points sit in the NR 547 Week 6 rubric
Lifespan write-ups are generally judged on accurate developmental and clinical content, concrete description at each age, attention to informants, relevant age-specific differentials and a clear comparison. Holding one symptom constant makes the change in reasoning visible, which is the point of the week. Concrete presentations at each age read as clinical knowledge rather than general statements about development. Naming the informant for each band, with its limitations, shows assessment skill. Age-specific alternatives, including medical causes in older adults, show breadth. A comparison that explains what a clinician must do differently at each age completes the analysis. Guidelines and reviews for children and older adults, cited in APA 7, support the claims.
NR 547 Week 6 help: mistakes that cost points
Write-ups often describe three different disorders instead of one symptom across three ages. Keep the complaint constant. Another weakness is general statements, such as children show depression differently, with no concrete example. Describe what the child actually does. Some students forget the informant, although a parent, a teacher and a spouse see very different things. Name them. Avoid carrying one differential across all ages; the live alternatives change. In older adults, put delirium and medical causes first. In adolescents, include substances and the onset of episodic mood disorders. Finish with a comparison that draws out the practical differences, rather than a summary that repeats each section. Keep the three age sections roughly equal in length.
Get a NR 547 Week 6 example written to your instructions
Send the Week 6 instructions with the symptom and the age bands your section names, and a custom example is written across those ages and returned inside 24 to 48 hours. The first one is free. How you read the particular child sitting in front of you stays your own call.
More NR 547 papers and PMHNP samples
- NR 547 Week 1: Diagnostic Position Discussion
- NR 547 Week 2: Criteria Mapping Write-Up
- NR 547 Week 3: Diagnostic Formulation
- NR 547 Week 4: Rule Out Analysis
- NR 547 Week 5: Two-Diagnosis Case Analysis
- NR 547 Week 7: Medical Mimic Brief
- NR 547 Week 8: Diagnostic Case Paper
- NR 546 Week 6: Adverse Effect Brief
NR 547 Week 6 questions, answered
Do the criteria themselves change with age?
Mostly not, and that is the interesting part. A small number of published allowances exist for younger presentations, and beyond those the wording holds while the clinical meaning moves. Base rates differ, the way distress gets voiced differs, and the competing explanations differ. A write-up claiming the criteria are age adjusted throughout overstates it; one claiming age is irrelevant misses the assignment.
How many age bands should I cover?
Whatever the instructions name, and where they leave it open, three is usually enough to carry the argument: a child, an adolescent or young adult, and an older adult. More bands tend to shrink each section into a sentence of generalization. The mark comes from the depth of the contrast rather than from covering every decade of a life.
Can I use one family across the ages?
It reads well when the instructions allow it, since a grandparent, a parent and a child presenting with the same complaint makes the contrast vivid and lets you treat heritability honestly. Keep the material constructed rather than drawn from anyone real, and make sure each section still stands on its own evidence rather than borrowing from the section before it.
Where can I find a free NR 547 Week 6 sample paper?
The irritability-across-three-ages write-up is displayed above as the NR 547 Week 6 sample, in full on this page. If your prompt uses a different symptom, name it for us and a write-up following it across the lifespan can be drafted.
What changes across ages in the NR 547 Week 6 sample?
The informants, the alternatives that are live and the first thing to exclude. For irritability, that shifts from development and learning at seven to substances at seventeen and delirium at seventy.