Fingerprick

A fingerprick, also called a fingerstick, is a method of obtaining a small amount of blood from the fingertip by pricking the skin with a sterile lancet. The puncture is usually made on the side of the fingertip to minimize nerve sensitivity. After cleaning the area with alcohol, the first drop of blood is often wiped away, and subsequent drops are collected using a capillary tube, a small test device, or applied directly to a test strip or card for analysis. Squeezing the finger is generally discouraged to avoid contamination with tissue fluid, which can affect test results.

Uses and applications:

Fingerprick samples are widely used for point-of-care testing, most notably for glucose monitoring in people with diabetes. They are also employed for rapid tests and small-volume laboratory assays that require only a few microliters of blood, including certain infectious disease screenings and anemia checks.

Advantages and limitations:

The method enables rapid testing outside traditional laboratories and minimizes the need for venipuncture. It is convenient for home use and quick screening. Limitations include potential sample quality issues from tissue fluid contamination or improper collection, variability in results for some tests, and the fact that not all assays are validated for finger-prick specimens.

Safety and handling:

Sterile, single-use lancets and proper disposal are essential to reduce infection risk. Users should follow manufacturer instructions, maintain hygiene, and seek professional guidance for individuals with bleeding disorders, skin infections, or latex allergies.