Which of the following are indications for capillary puncture?

• A. Newborn screening
• B. POCT
• C. DM monitoring
• D. All of the above

Answer: (D)

Capillary puncture is chosen whenever only a small amount of blood is needed and rapid results are advantageous. Newborn screening relies on a tiny sample obtained from a heel prick and collected on filter paper for dried blood spots, making capillary collection the standard method. Point-of-care testing also often uses capillary blood from a fingerstick to deliver quick results at the bedside or in clinics, avoiding delays from sending samples to a central lab. Diabetes monitoring routinely uses capillary blood from a fingerstick for home glucose testing and many POCT devices, providing convenient, frequent measurements. Because this sampling method fits all these practical needs, all of the above are valid indications for capillary puncture. Of course, some tests still require venous blood or special handling, so capillary sampling isn’t universal for every assay, but these scenarios clearly illustrate common indications.