If ClinVar shows different answers for the same variant, resist the temptation to count laboratories and choose the most popular answer. First find out whether the submissions address the same clinical question. Then compare their evidence, dates and review status. This guide gives you a worksheet for that conversation; it does not classify a personal result.
Start with the result in front of you
Imagine opening a laboratory report, searching its variant in ClinVar, and finding both “uncertain significance” and “likely pathogenic.” That is understandably unsettling. The useful next step is to write down exactly what differs. Is one laboratory assessing a different condition? Does one submission cite evidence that the other has not discussed? Or are both interpreting the same evidence differently?
ClinVar archives classifications supplied by laboratories, expert groups and other contributors. It makes disagreements visible, but does not resolve every dispute. Different condition-specific records can sit beneath one variant record. NCBI explains these distinctions in its ClinVar FAQ.
A six-step reading worksheet
- Copy the exact variant description. Keep the gene, reference sequence and version, DNA change and, where supplied, genome assembly. A familiar protein abbreviation alone may leave ambiguity. Record the ClinVar accession and the date you consulted it.
- Write the question in plain language. For example: “What evidence connects this inherited variant with this condition?” An inherited-disease question and a tumor-treatment question should not be merged.
- Open the individual submissions. Separate the overall summary from each submitter’s classification, condition, criteria and evidence. Make a column for information that is missing.
- Compare evaluation dates. Ask when the classification itself was evaluated. A recent page update does not, by itself, explain whether the underlying interpretation was reassessed.
- Describe the disagreement. State the difference precisely: condition, evidence, interpretation rule or an unresolved issue. “The laboratories disagree” is a starting observation, not an explanation.
- Take the unresolved question back to the reporting laboratory or clinical team. Ask whether the newer or conflicting information affects their assessment and whether a formal reanalysis is appropriate. Keep their response with the original report.
For searching and organizing these notes, use our variant evidence worksheet. It creates research links and a checklist; it does not issue a clinical classification.
Which record are you reading?
| Record | What it organizes | Why it helps |
|---|---|---|
| SCV | An individual submission | Inspect a contributor’s own statement and supporting information. |
| RCV | A variant–condition combination | Check whether conclusions concern the same condition. |
| VCV | The variant across submissions | Find the wider collection, then investigate its components. |
The version is useful when documenting the record you actually consulted. These accession types reflect ClinVar’s archive structure; they are not separate genetic tests.
What the stars can tell you
Stars summarize review status, not a percentage probability of disease. In germline aggregate records, an expert-panel classification receives three stars and a practice-guideline classification four. Two stars indicate multiple submissions with supplied criteria and no conflict; one star can describe either a single qualifying submitter or conflicting qualifying submissions. Read the accompanying words rather than the icon alone. NCBI’s review-status table also explains why the rules for somatic clinical impact differ.
ClinVar’s aggregate classification follows precedence rules; it is not a simple majority vote. Expert-panel or practice-guideline submissions can determine the displayed summary despite different classifications elsewhere in the record. See how ClinVar represents classifications before building an automated rule around the headline label.
A fictional comparison you can practice with
The following example is invented for teaching. It does not describe a real variant or laboratory.
| Question | Laboratory A | Laboratory B | Your follow-up |
|---|---|---|---|
| Conclusion | Uncertain significance | Likely pathogenic | Confirm that both concern the same variant and condition. |
| Evaluation | An earlier assessment | A later assessment | Identify what changed; recency alone is not evidence. |
| Supporting material | Limited family information | Cites an additional family study | Read that study and ask whether the earlier assessment considered it. |
| Unresolved point | No detailed functional discussion | Mentions a functional experiment | Check the experiment’s controls and relevance rather than treating “functional” as a verdict. |
A useful note would be: “The later submission cites evidence absent from the earlier explanation; I need to establish whether that evidence resolves the difference.” It would not be: “The newer laboratory must be right.” This distinction makes a journal-club discussion or a laboratory query much more specific.
For researchers: make the comparison reproducible
Keep the accession versions, retrieval date, classification type and the exact records included in your analysis. Define what you counted as a conflict before reporting its frequency. If your project filters by stars, document the rule and its purpose. Another researcher should be able to reconstruct your dataset and understand what it excludes.
Submission processing is also distinct from clinical review. ClinVar checks aspects such as variant representation; its staff do not assess the appropriateness of every submitter’s classification criteria. NCBI describes those validation limits. Passing an archive check is therefore not independent confirmation of the medical conclusion.
Questions worth taking to an appointment
- Does this database record describe the exact variant and condition on my report?
- Has the reporting laboratory considered the conflicting submission?
- Is there new evidence, or a different interpretation of existing evidence?
- Who will notify me if the laboratory revises its report?
For the evidence framework behind variant classifications, read our ACMG/AMP guide. To compare the studies cited by two submitters, open the paper-comparison workspace. If this concerns your own care, bring the original laboratory report to a qualified genetics professional; an isolated database entry cannot supply the full clinical context.