Blood lancet

A blood lancet, or simply lancet, is a small medical implement used for capillary blood sampling. A blood lancet is similar to a small scalpel but with a double-edged blade or needle. Lancets are used to make punctures, such as a fingerstick, to obtain small blood specimens. Blood lancets are generally disposable.

Box of disposable lancets.
Blood-sampling device with a lancet at the tip.

Lancets are also used to prick the skin in skin testing for allergies.[1]

A blood-sampling device, also known as a lancing device, is an instrument equipped with a lancet. It is also most commonly used by diabetics during blood glucose monitoring. The depth of skin penetration can be adjusted for various skin thicknesses. Long lancing devices are used for fetal scalp blood testing to get a measure of the acid base status of the fetus.

Blood sampling

The small capillary blood samples obtained can be tested for blood glucose, hemoglobin, and many other blood components.

gollark: They *are* often kind of insecure though.
gollark: It's not just some arbitrary thing where you have to set up a GPS host or it won't tell you some location it magically got, it actually *requires* the hosts to work.
gollark: It uses true range multilateration on those to figure out the location of your client device.
gollark: `gps.locate` knows the distances to each GPS host, and their locations.
gollark: No, not necessarily.

References
  1. Abstract: The Allergy Pricker
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