Dried blood spot (DBS) collection uses a few drops from a fingerstick dried on a card; venous blood is drawn from a vein. Each has trade-offs for at-home testing.
Dried blood spot (DBS)
You prick a finger, place drops on a collection card, let it dry, and mail it. DBS is inexpensive, stable at room temperature, and easy to ship – ideal for at-home programs.
Venous blood
A phlebotomist draws blood into tubes. It provides a larger volume, which supports a wider range of tests and certain assays that need serum or plasma.
How they compare
DBS wins on convenience and logistics; venous wins on volume and test breadth. For many common markers, validated DBS methods match venous accuracy – the key is a lab that has validated the specific assay for DBS.
Which to choose
For broad panels or specialized assays, venous is often preferred. For targeted at-home screening and monitoring, DBS makes testing far easier to complete.
FAQ
Is a dried blood spot as accurate as a venous draw?
For assays validated on DBS, results are comparable. Accuracy depends on the lab validating each specific marker for DBS.
Why do some kits still require venous blood?
Certain tests need more blood volume or serum/plasma that a few dried drops can’t provide.
Can I do a dried blood spot at home?
Yes – DBS is designed for at-home collection with a simple fingerstick and a mail-in card.
This article is educational and not a substitute for medical advice.