sema4.com
Link authority for sema4.com (registrable domain: sema4.com) from the Common Crawl web graph: PageRank and harmonic centrality history since 2017, current scores, and the site's top backlink sources.
Web-graph authority (0-100)
Domain scores measure sema4.com as a whole: every subdomain's links rolled up into one node of Common Crawl's domain-level web graph. Host scores measure the exact hostname sema4.com. WWW scores cover the www variant of that hostname, which the graph tracks as its own entry since January 2026 (before that, www and bare host were merged). A big gap between domain and host usually means the domain's authority lives on other subdomains. PageRank is link-endorsement authority: how much weight the sites linking here carry themselves. Harmonic centrality measures reach: how close this site sits to the rest of the web when following links, which favors broadly connected sites over ones boosted by a few heavy linkers. All are normalized 0 to 100 within each crawl snapshot; a dash means that series does not exist for this site.
Homepage
What sema4.com presents on its own homepage: the page title, description, and the social share markup it publishes. Pulled from https://sema4.com.
| Title | Genetic Testing for Rare Disease Diagnosis | GeneDx |
|---|---|
| Description | GeneDx provides advanced genetic testing to help diagnose rare and inherited conditions. Trusted by clinicians and leading hospitals. Get started today. |
| OG Title | Genetic Testing for Rare Disease Diagnosis | GeneDx |
| OG Description | GeneDx provides advanced genetic testing to help diagnose rare and inherited conditions. Trusted by clinicians and leading hospitals. Get started today. |
| Twitter Title | Genetic Testing for Rare Disease Diagnosis | GeneDx |
| Twitter Card | summary_large_image |
Social accounts and contact points
Where this site maintains a presence and every reachable route its homepage exposes: social accounts, contact pages, addresses, and content feeds.
| GeneDxLab | |
| genedxlab | |
| genedx (business) |
Structured data (JSON-LD)
The schema.org markup this homepage publishes: the machine-readable identity search engines and AI systems read. Types found: Organization, FAQPage.
JSON-LD block (984 bytes)
{
"@context": "https://schema.org",
"@type": "Organization",
"@id": "https://www.genedx.com/#organization",
"name": "GeneDx",
"alternateName": [
"GeneDx, LLC",
"GeneDx Holdings Corp."
],
"url": "https://www.genedx.com",
"description": "GeneDx provides genetic testing and genomic services to support diagnosis and care for patients with rare and complex conditions.",
"slogan": "Empowering everyone to live their healthiest life through genomics",
"foundingDate": "2000",
"logo": "https://cdn.prod.website-files.com/69179b7a79bdf6bd80578e16/695ea510519901fa6662a98d_gene_logo.svg",
"image": "https://cdn.prod.website-files.com/69179b7a79bdf6bd80578e16/695ea510519901fa6662a98d_gene_logo.svg",
"sameAs": [
"https://en.wikipedia.org/wiki/GeneDx",
"https://www.wikidata.org/wiki/Q5531048",
"https://www.linkedin.com/company/genedx",
"https://www.instagram.com/genedxlab/",
"https://x.com/GeneDx",
"https://ir.genedx.com/"
]
}
JSON-LD block (2,364 bytes)
{
"@context": "https://schema.org",
"@type": "FAQPage",
"mainEntity": [
{
"@type": "Question",
"name": "How do I get genetic testing?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Genetic testing is typically ordered by a healthcare provider based on a patient’s symptoms and medical history. Providers can explore available tests and ordering options through GeneDx, while patients and families can learn how to get started and what to expect during the process."
}
},
{
"@type": "Question",
"name": "What does GeneDx test for?",
"acceptedAnswer": {
"@type": "Answer",
"text": "GeneDx provides genetic testing and genomic sequencing to help diagnose rare and complex conditions. Our testing supports patients with developmental delay, intellectual disability, epilepsy, autism spectrum disorder, congenital anomalies, and other inherited conditions across pediatric and adult populations."
}
},
{
"@type": "Question",
"name": "Who should consider genetic testing for rare disease?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Genetic testing may be appropriate for individuals with unexplained developmental delays, intellectual disability, epilepsy, congenital anomalies, or other suspected genetic conditions. Healthcare providers can determine when testing is appropriate based on clinical presentation."
}
},
{
"@type": "Question",
"name": "What are the benefits of exome and genome sequencing?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Whole exome and genome sequencing analyze thousands of genes at once, increasing the likelihood of identifying the underlying cause of a condition. These tests can help deliver faster, more accurate diagnoses and inform medical management and care decisions."
}
},
{
"@type": "Question",
"name": "How can clinicians order genetic testing?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Clinicians can order genetic testing through GeneDx by selecting the appropriate test and submitting a requisition form. Our team provides support throughout the ordering process, including test selection, specimen requirements, and result interpretation."
}
}
]
}
Authority over time
Every Common Crawl web-graph release since 2017, roughly quarterly. The domain series goes back to 2017; Common Crawl only began publishing the host-level graph in 2020, so host lines start there. Click a legend entry to show or hide that line. Flat lines are normal for established sites; watch for sustained rises or drops, which track real gains or losses in who links here.
A note on www: through the end of 2025 the source web graph merged www and non-www hostnames into the bare name, so one host line covers both. Starting in January 2026 the graph splits them into separate entries, which is why www can carry its own scores going forward.
Backlink counts
Unique linking domains seen in Common Crawl's link graphs. This is a different dataset than the 0-100 authority scores above: these are raw counts, host-level for sema4.com and domain-level for sema4.com with all its subdomains combined. Common Crawl covers a large sample of the web, not all of it, so treat counts as comparable between sites rather than absolute totals.
Top backlinks in the domain graph
Common Crawl publishes two link graphs. The DOMAIN graph connects whole domains: every link from any page of one domain to any page of another. This table shows the highest-authority domains linking to sema4.com (including its subdomains), ranked by the linker's PageRank. The table shows the top 75; the download carries the full stored list (up to 10,000 linkers) as JSON. Click a linker for its own site profile.
Top backlinks in the host graph
The HOST graph connects exact hostnames, so subdomains count separately. This table shows the highest-authority hosts linking to sema4.com specifically, ranked by the linker's PageRank. The table shows the top 64; the download carries the full stored list (up to 10,000 linkers) as JSON. Click a linker for its own site profile.