Clue 1: Orient yourself
Why does the expert inspect before choosing a tool?
Use the labels and the picture's left-to-right, near-to-far, or before-and-after order. Name only what you can point to.
The question
Why does the expert inspect before choosing a tool?
Why it matters: Cleft care connects diagnosis, feeding, speech, hearing, and family support. A weak classification can send a team toward the wrong problem or make an important need easy to miss. Today you practice the professional reasoning behind that work: Testing is most useful when the history and exam create a question the test can answer.
On your WebXam
Using diagnostic yield to decide whether a cleft baby needs a chromosomal microarray
For life
To find the cause, change one thing and watch what changes.
Principle: Same look, different cause
Five principles we return to
Having it is not using it
Same instructions, different switches
Same look, different cause
Change one thing and watch
Boss or doorman?
Decides the result or only allows it
Held down, not gone
Remove the brake and it returns
Many roads, one ending
One result can begin many ways
Try the everyday version first
Choose the right tool after you inspect the wall
A wall can hide pipes, wires, studs, and empty space. A builder first asks what might be hidden, then chooses the tool that can detect that feature.
Do not jump to the biology yet. Treat the picture as a small system. Track its parts, follow one change at a time, and keep more than one explanation open until the picture supplies a way to separate them.
Clue 2: Trace one change
Which tool is broad and which is targeted?
Follow one object, stage, or path. Point to the first place where the situation changes instead of jumping to the ending.
Clue 3: Keep the cause open
Could the most expensive tool still be the wrong first choice?
List more than one explanation that still fits. Name the extra observation that would help you separate those possibilities.
Now inspect the illustration
Work from the visible evidence. A useful answer names the part of the picture that supports it and leaves unknown causes open.
- 1Why does the expert inspect before choosing a tool?
- 2Which tool is broad and which is targeted?
- 3Could the most expensive tool still be the wrong first choice?
Tier 1 check
Finish with the everyday model
Use the everyday picture to answer today's question in plain words: Why does the expert inspect before choosing a tool?
You can complete today's required check without opening the technical details below.
Ready for the real names? Optional tier 2
Technical rules and limits
Rule 1: Define the question before ordering a test.
Rule 2: Match test scale to the suspected problem.
Rule 3: A normal result does not erase evidence outside the test's range.
Where the analogy stops: DNA testing is not construction work. The analogy models matching a tool to a question.
Carry the previous idea forward
A red-flag checklist turns a broad syndrome question into specific findings that can be checked.
Today's technical takeaway
Testing is most useful when the history and exam create a question the test can answer.
Now map the same rules onto biology
Let the exam choose the genetic test
Visual inspection
Dysmorphology exam and family history
Targeted detector
A gene test when a specific syndrome is suspected
Broad wall scan
Chromosomal microarray for unexplained multiple anomalies
The best test is the one that can answer the clinical question in front of the team.
Mateo's case file: evidence supplied in this lesson
D05-E1
Mateo's structured exam shows the cleft but no additional congenital anomalies.
Why it matters: The current pattern is more consistent with an isolated finding than a multiple-anomaly pattern.
D05-E2
The three-generation family history shows no repeated cleft pattern or matching syndrome features.
Why it matters: There is no clear single-syndrome target from family history.
D05-E3
Chromosomal microarray is best at detecting missing or extra DNA segments, not every possible DNA change.
Why it matters: A broad test has a defined scope and a normal result has limits.
Make the clinical decision
You are the clinical geneticist deciding what to recommend today.
Mateo has one major structural finding and no additional anomalies after a careful exam.
ADocument the completed genetics evaluation and reserve testing for new findings or a specific question
BOrder every available genetic test
CTell the family genetics has no role
Choose a testing plan, cite the case evidence, and state one thing your plan cannot rule out.
Evidence required
D05-E1 + D05-E2 + D05-E3 Claim ceiling
You may justify a measured testing plan. You may not say a normal microarray proves there is no genetic contribution.Go deeper Optional tier 3
Everything required for today is above. Open these only if you want the explainer, source trail, or download files.
The everyday model and Tier 1 check are the complete required path for this lesson.
Use these checks to keep your place. They are not turned in through the portal.
Check off as you finish
- Worked through the everyday picture and answered its three questions.
- Completed the Tier 1 check in plain words.
Turn in: Disease lesson 5: The Exam and the Test That Sort Syndromic from Isolated
Go to Schoology to turn this in.
Submit one PDF. Put your first and last name in the document header. Name the file: FirstName LastName - Assignment Title - YYYY-MM-DD.pdf.
Open Schoology PDF upload helpIf you cannot get in, see Mr. Mendoza. Do not skip the work.
Optional legacy technical materials Open only if you want the original notes, vocabulary, artifact, and CER work
Before this page, you should know
- is the most common (about 2% of all patients); its red flag is lower-, often inherited (autosomal dominant, about 50% recurrence).
- presents with or plus a heart defect, low calcium, and immune/thymus problems; it is life-threatening if missed.
Today's new idea is only
The exam decides the test: the more isolated the looks, the less a genome scan adds.
Goal: Students will describe the head-to-toe and the , and use the diagnostic-yield data (high yield when other anomalies are present, near-zero in lip) to explain why testing is targeted, not automatic.
Know by the end
- The is a structured, head-to-toe protocol (measurements plus a deliberate look at face, eyes, ears, , heart, limbs, skin, growth, and family history), not a glance.
- scans the genome for copy-number variants (deleted or duplicated DNA) and can catch invisible causes like the 22q11.2 deletion.
- depends on the exam: CMA is positive in about 33% of non-isolated clefts and about 25% of , but close to 0% in lip alone.
- Because most CL/P (about 70%) is isolated and low-yield, testing is targeted by exam findings and type rather than ordered for every baby.
1
Two sorting tools
Model start: Two tools sort syndromic from isolated: a structured and a chromosomal .
- The ______ exam is a structured, head-to-toe search for associated anomalies; finding even one raises the chance of a syndrome.
- The scans the genome for ______ variants (missing or duplicated DNA).
2
Yield decides the test
- CMA is positive in about 33% of non-isolated clefts and about 25% of , but close to 0% in lip alone, so its ______ yield depends on the exam.
- Testing is targeted, ordered when the exam or type raises the odds, not automatic for every baby.
3
Applying it to Mateo
- His structured exam found no associated anomalies, placing him in the low-yield, isolated-appearing category.
- The evidence keeps pointing one direction, but the isolated-versus-syndromic classification remains provisional until the whole picture is assembled.
Everything you need for today is on this page. These links are optional.
What to read
Read the short plain-language explanation written for this lesson. Plain-language explainer for this lesson
Why this source matters
This explanation gives you the background for today's idea without making you decode a research paper: The exam decides the test: the more isolated the looks, the less a genome scan adds.
Words to unlock first
dysmorphology examchromosomal microarray (CMA)copy-number variantdiagnostic yieldisolated cleft
Reading moves
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Stop point
Stop after the final 'Use it now' section. The research citations are available separately for advanced readers.
Your output
Write one claim-evidence sentence: state the main idea, then name the example or evidence that supports it.
Where this fits
Tested on (Ohio WebXam)
Genetics of Disease · 072130
PLTW lesson
MI · Disease domain · Medical Interventions (MI), Unit 2 genetic testing and diagnosis
WebXam domain
Molecular and Genetic Technology
Evidence to produce
Write the testing-decision note for two babies (a baby with cleft plus heart defect plus low calcium, and Mateo with isolated CLP and a clean exam): for each, decide whether to order CMA and justify it with a yield number, then write one plain-language sentence for the family on what a 'negative' or 'isolated' result would and would not tell them.
Lab / skill
Clinical backbone (cleft team) · Clinical backbone (cleft team)
Everything required for today's decision is already in the case file and plain-language explainer. The links below are original papers and database records for teachers and advanced readers, not assigned student reading.
- American Cleft Palate Craniofacial Association. 2024 Parameters of Care.
- Yan S, et al. 2024. Prenatal CL/P ultrasound abnormalities and copy number variants. Ital J Pediatr. [PMID:39169438]
- Askarian S, et al. 2022. Genetic factors in cleft lip-cleft palate and clinical utility. Oral Maxillofac Surg. [PMID:35426585]
- Wilkes C, et al. 2023. Prenatal diagnosis of cleft lip and/or palate: counseling parents. Prenat Diagn. [PMID:37552068]
- Claim: For Mateo, a chromosomal is ____ (high-yield / low-yield).
- Evidence: His structured exam found ____ associated anomalies, and CMA is positive in about ____% of cases versus about 33% of non-isolated ones.
- Reasoning: This means the team should ____, because ____.
How this is graded (rubric)
For: Write the testing-decision note for two babies (a baby with cleft plus heart defect plus low calcium, and Mateo with isolated CLP and a clean exam): for each, decide whether to order CMA and justify it with a yield number, then write one plain-language sentence for the family on what a 'negative' or 'isolated' result would and would not tell them.
| Criterion | Proficient | Developing | Beginning |
|---|---|---|---|
| Complete | Every required part of the artifact is present and filled in. | Most parts are present, but one is missing or left blank. | Several parts are missing. |
| Accurate | The science and data are correct and match the evidence. | Mostly correct, with a small factual slip. | Key science or data is wrong. |
| Scientific reasoning (CER) | States a claim, backs it with specific evidence, and explains the reasoning. | Has a claim and evidence, but the reasoning is thin or missing. | Gives an answer with no evidence or reasoning. |
| Professional communication | Clear, organized, and labeled the way a clinician or scientist would write it. | Readable but disorganized or missing labels. | Hard to follow. |
| Submitted | Turned in through the route named under Submit here and confirmed. | Turned in, but in the wrong place or unconfirmed. | Not turned in. |
How the model answer scores against this rubric
- CompleteProficient: Nothing is left blank: the model fills every part of "Write the testing-decision note for two babies (a baby with cleft plus heart defect plus low calcium, and Mateo with isolated CLP and a clean exam): for each, decide whether to order CMA and justify it with a yield number, then write one plain-language sentence for the family on what a 'negative' or 'isolated' result would and would not tell them.".
- AccurateProficient: Every number and claim matches the case evidence.
- Scientific reasoning (CER)Proficient: It names a claim, cites the specific evidence, and explains the reasoning, not just the answer.
- Professional communicationProficient: It is organized and labeled like a real chart note.
- SubmittedProficient: It would be attached to your class form or handed in, and confirmed.
What's next: We sorted the exam and tests that separate a syndrome from a lone , and Mateo's structured exam and testing point toward an . That workup takes time to complete, and meanwhile a two-day-old still has to eat. So how do we keep Mateo fed and growing while the rest of the picture comes together?