Method
How a lesson is made
The same process for every lesson, in the same order, with nothing skipped. This page is the standard we hold ourselves to; if a lesson falls short of it, tell us.
1. One objective
A lesson starts as a single learning objective, mapped to the exam’s published content outline, with its prerequisites and the next lesson in the series written down before anything else. Anything outside that objective is left for another lesson.
2. A source for every claim
The script is written line by line against a source ledger. Each factual line carries a claim number, and each claim points to at least one authoritative source that was opened and read: current US guidelines (for example from the AHA/ACC), standard references such as the MSD Manual Professional Version, review articles and physiology texts. Where sources disagree, for instance on a normal range, the ledger records the difference and the lesson says which convention it uses.
The sources appear under every video and, numbered, at the end of every lesson page on this site.
3. Independent accuracy checks
- The writer checks the script against the ledger.
- Two separate audits then work through the lesson independently. Each recomputes every number and answers the practice question blind; the second does not see the first one’s report.
- After the video is rendered, a final review goes through it frame by frame: what is on screen, what is said, and whether they match the sources.
A lesson is not published while any serious finding is open. Every fact is checked against the cited sources in these independent accuracy reviews.
4. Original questions
Every practice question is written for its lesson, with a synthetic patient and values that are checked for internal consistency. None is recalled from a real exam or adapted from a question bank. Each one has a single best answer and an explanation for every option: in the video, the wrong options are struck through first, each with its reason, and the correct one is circled last.
5. Drawn, not generated
Graphs, ECG strips, lab slips and diagrams are drawn in code from the lesson’s own numbers. Anatomical illustrations come from licensed libraries such as Servier Medical Art (CC BY 4.0) and are credited on each lesson. We do not use AI-generated anatomy, labels or graphs.
6. Guidelines and ranges
Step 2 CK lessons follow current US guidelines, because that is what the exam tests, and note where UK or European practice differs. Normal ranges vary between laboratories; each lesson states the ranges it uses. Always follow your local guidelines and your own laboratory’s ranges in practice.
7. Corrections
If you find an error, email info@medservatory.com with the lesson code (shown under each lesson’s sources, for example MS-S1-REN-001) and what you think is wrong. We check it against the sources, fix the lesson page, correct or re-issue the video where needed, and log the change here and on the lesson.