The Exam and the Test That Sort Syndromic from Isolated
Disease domain · Lesson 5 of 20 · Shared clinical backbone (the cleft team)
Today's goal: Students will describe the head-to-toe dysmorphology exam and the chromosomal microarray (CMA), and use the diagnostic-yield data (high yield when other anomalies are present, near-zero in isolated cleft lip) to explain why testing is targeted, not automatic.
This is a model of the work you should turn in. Use it to check your own: match the structure and the level of detail, do not copy it. Your wording should be your own.
Baby with cleft + heart defect + low calcium:
- Order CMA? Yes.
- Why (with a number): this baby is non-isolated, and CMA is positive in about 33% of non-isolated clefts, a high enough yield that testing is clearly indicated (and could catch a 22q11.2 deletion).
Mateo (isolated CLP, clean exam):
- Order CMA? Exam-first; CMA is low priority right now.
- Why (with a number): a clean dysmorphology exam places him in the isolated category, where CMA yield is close to 0% for isolated cleft lip alone, so a genome scan adds little.
For the family: a negative or 'isolated' result is reassuring and means no copy-number cause was found, but CMA does not test for every possible cause, so it lowers rather than zeroes the chance of a syndrome.
This model shows the level of evidence and organization needed to complete: A targeted-testing decision for two cases, each justified with a diagnostic-yield number.
- Write one defensible claim.
- Choose specific evidence that supports the claim.
- Explain the scientific rule that connects the evidence to the claim.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Keep the final label open; this note reports where the evidence points, it does not close the case.
The finished product above did not appear all at once. Here is the path from the question to the turned-in work, so you can follow the same steps.
- 1Start from today's question: Why does the expert inspect before choosing a tool?
- 2Work the Model and the Explore questions to reason it out before writing anything.
- 3Pull the specific evidence the product needs from the reading and any database you used.
- 4Write it up in the required format: Write the testing-decision note for two babies (a baby with 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.
- 5Check it against the rubric, then submit.
| 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. |
- 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.
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.
It builds this reusable test skill: Using diagnostic yield to decide whether a cleft baby needs a chromosomal microarray.
- Name the concept or data pattern being tested.
- Cross out choices that violate that rule or the evidence.
- Justify the best remaining choice before checking the answer.