Capillary blood collection is typically used in which situation?

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Capillary blood collection is used when only a small amount of blood is needed or when veins are hard to access, such as in newborns, infants, or patients with difficult venous access. This method lets you obtain a tiny sample quickly via a fingerstick or heelstick, which is ideal for tests that don’t require a large volume—like glucose, bilirubin, and many point-of-care or newborn-screening tests. Because the sample is small and can include a mix of arterial, venous, and interstitial fluid, it isn’t suitable for tests that need larger volumes or precise venous blood composition, and it isn’t used when arterial samples are required.