What Is Whole Genome Sequencing? And Do You Need It?

A standard consumer DNA test reads roughly 700,000 specific spots in your genome. Whole genome sequencing reads all three billion base pairs. The difference between the two sounds enormous, and technically it is, but whether that difference is worth paying for depends entirely on what you plan to do with the data.

The 700,000 versus 3 billion gap

Genotyping arrays, the technology behind AncestryDNA, 23andMe, MyHeritage, and most other consumer tests, work like a checklist. The chip has probes for several hundred thousand pre-selected SNP positions, and at each one it reports which letters you have. According to 23andMe’s product technology pages, their array covers roughly 600,000 to 700,000 SNPs. That is enough for ethnicity estimates, cousin matching, and a meaningful set of trait and health markers.

Whole genome sequencing, by contrast, reads your entire genome by chopping your DNA into millions of short fragments, sequencing each fragment, and computationally stitching the results back together. The end product is your full three-billion-base genome, including the roughly 99.7% of your DNA that consumer SNP arrays never touch. For the basic mechanics of how both methods work, see our how DNA tests work guide.

Coverage and depth

Two terms matter when comparing whole-genome products.

Coverage is the percentage of your genome the sequencing actually reads. A good whole-genome product targets 100% of the genome, though some regions are technically difficult and may be reported with lower confidence.

Depth is how many times each position is read on average. 30x depth, the clinical-grade standard, means every position is sequenced about 30 times, which gives high confidence in each call. Low-pass or shallow sequencing might run at 1x to 4x and trades accuracy for cost.

When a company says “whole genome sequencing”, ask the depth. A 30x kit and a 1x kit are very different products at very different prices.

Where to buy whole-genome sequencing as of early 2026

The consumer whole-genome landscape contracted sharply in February 2025 when Nebula Genomics shut down its consumer service. That left a smaller set of buyable options.

Sequencing.com is the option most 2026 review sources point to as the active whole-genome-first consumer product. It also accepts uploads of existing raw data and runs a marketplace of third-party apps that generate reports from your genome. Pricing and current depth tiers should be verified directly with Sequencing.com before purchase, since whole-genome pricing changes frequently.

Some clinical and research labs sell whole-genome sequencing directly to consumers as well, often at higher prices and with more medical-grade reporting. Those sit between consumer products and the full clinical genetic testing your doctor would order, which is a separate category.

Who actually needs it

For most people the honest answer is no one. For specific use cases the answer is yes.

You probably do not need whole-genome sequencing if your goal is finding relatives, getting an ethnicity estimate, or learning common trait and carrier-status reports. A standard SNP test costs a fraction as much and does these jobs well. AncestryDNA at a $39 sale price gives more relative matches than any whole-genome product, because matching depends on database size and Ancestry’s database is the largest at roughly 25 to 30 million.

You might benefit from whole-genome sequencing if you want to feed your genome into multiple third-party analysis tools over years, you have a documented medical reason that calls for deeper data (a conversation for your doctor or genetic counselor, not a marketing page), or you are a researcher or hobbyist who wants the most complete dataset available to a consumer.

You should be cautious about assuming whole-genome data will give you medical answers a doctor cannot. Most of the genome’s clinically actionable variation is in regions a standard test does not cover, but interpreting those variants for an individual is the job of a clinical geneticist, not a consumer dashboard. If a whole-genome result concerns you, the NSGC genetic counselor directory is the right next step.

The cost question

Whole-genome sequencing costs have fallen dramatically over the past decade. A research-grade 30x whole genome that ran tens of thousands of dollars in 2010 is available to consumers in the hundreds of dollars as of early 2026, with prices moving constantly. That said, a standard SNP test on sale for under $40 still costs roughly an order of magnitude less. See our DNA test cost guide for the SNP-test side of the price picture.

For comparison shopping across all current options, our guide to choosing a DNA test is the umbrella page.