Capillary collection

• Capillary collection is also used for ancillary blood glucose testing.
• Venipuncture may be contraindicated for

  patients with burns or scars over venipuncture

  sites or for those at risk for venous thrombosis.
• Iatrogenic anemia is anemia caused by excessive blood draws.
• CBG determination can be used as an alternative to arterial puncture for ABG determination in infants.
• The arterial proportion in the sample is

  increased when the collection site is warmed, as may be done to help increase blood flow before collection.
• The dimensions of the puncture are controlled by the width and punture of the point.
• Lasette laser lancing device The device is approved for patients 5 years and older.
• Microcollection tubes hold up to 750 mL of blood.
• Caraway or Natelson pipets are narrow glass tubes with capacities up to about 470 mL.
• Caraway or Natelson The use of these tubes has declined in recent years.
• Microhematocrit tubes are small tubes, either

  plastic or glass, with a volume up to 75.
• Neonatal screening drops of blood are applied directly to specially prepared filter paper.
• Interstitial fluid fills the spaces around cells, filtered from the blood capillaries, and drained away as lymph.
• Intracellular fluid facilitates the movement of fluid in the membrane and blocks the entrance of unwanted materials.
• Capillary tubes are used primarily for the collection of samples for CBG determinations.
• Be sure that the site is completely dry before puncture, however, as

  residual water will cause hemolysis and dilution of the specimen.
• The temperature of the device should not exceed 42° C-3 to 5 minutes.
• To minimize the risk of inflammation and infection, the lancet should

  never penetrate more than 3.0 mm.
• For a heel puncture, the maximum depth is 2.0 mm, because

  the calcaneus, or heel bone, can lie very close to the surface.
• For premature babies, the recommended depth is 0.65 to 0.85 mm.
• Puncture width should not exceed 2.4 mm.
• Puncture width is actually more important than depth in determining blood flow, because capillary beds may lie close to the skin, especially for newborns.
• 10-6, only the medial and lateral borders of the plantar (bottom)

  surface can be used.
• The center of the plantar surface is too close to the calcaneus, as is the posterior (back) surface.
• Use of povidone–iodine is not recommended for dermal punctures,

  because it may elevate test results for BURPP.
• A bleeding time (BT) test measures the length of time required for bleeding to stop after an incision is made.
• To perform a BT test, an automated incision device is used, with the depth set at 1 mm, and length at 5 mm.
• Normal BT is 2 to 10 minutes and depends somewhat on the device used.
• Salicylates, including aspirin, inhibit platelet function for 7 to 10 days

  after the last dose.
• Ibuprofen inhibits function for 24 hours.
• Place the cuff on the upper arm. Inflate it to 40 mm Hg.
• The blade is placed perpendicular to the antecubital crease on the volar surface of the forearm.
• One end is sealant and one end is clay.
• CBG eqUipment - collecting CBG specimen
• Lancet/Incision devices - are designed for use in making cuts in the skin for finger or heel puncture.
• Laser lancet - This is a type of lancet that produces a small hole in the skin by vaporizing water in the skin.
• Routine blood film is a blood test that is used to check abnormalities in the blood cells.
• Thick blood smear preparation is used to determine if the patient has malaria, which is diagnosed by its presence in the peripheral blood smear.
• Thick blood smear preparation - 2 hours
• Neonatal bilirubin collection is used to help determine any liver disorder in infants.