Collect blood samples when only a small amount of blood is needed or when there is difficulty obtaining samples by venipuncture or other source. Common studies include complete blood count (CBC), chemistries, liver function tests, sickle cell anemia, thyroid, bilirubin levels, toxicology/drug levels, bedside glucose monitoring, and newborn metabolic screening. Coagulation studies, chromosomal analyses, immunoglobulin titers, and some other, more sophisticated tests cannot be done on capillary sampling.
Capillary blood gas determination gives satisfactory pH and Pco2, but not Po2.
Blood cultures when venous access or other access is not possible. Sterile technique is required but heelstick is not the preferred method.
Newborn metabolic screen is ideally performed in the first 48–72 hours of life (however, can be done after 24 hours). It should be done before a transfusion and antibiotic therapy and ideally after receiving breast milk or formula to ensure accurate testing. See Chapter 15.
Automated self-shielding lancets are preferred in neonates (Table 33–1); sterile manual lancets are not recommended but may be used in some units if automated lancets are not available (sizes: 2 mm for <1500 g and 4 mm for >1500 g). Capillary tube (for rapid hematocrit and bilirubin tests) or larger BD Microtainer™ collection tubes (if more blood is needed [eg, for chemistry determinations]), filter paper card for newborn screening (if appropriate), clay to seal the capillary tube, a warm washcloth or heel warming device (eg, a chemical activated packet), antiseptic solution, gloves, and a diaper.
Table 33–1.COMMONLY USED AUTOMATED SELF-SHIELDING LANCETS FOR SAMPLE COLLECTION IN NEWBORNS |Favorite Table|Download (.pdf) Table 33–1.COMMONLY USED AUTOMATED SELF-SHIELDING LANCETS FOR SAMPLE COLLECTION IN NEWBORNS
|Device ||Infant ||Characteristics |
|Tenderfoot MicroPreemiea ||<1000 g ||Blue: depth 0.65 mm, length 1.40 mm Incision type |
|Tenderfoot Preemiea ||Low birthweight, 1000–2500 g ||White: depth 0.85 mm, length 1.75 mm Incision type |
|Tenderfoot Newborna ||Birth to 3–6 months, >2500 g ||Pink/blue: depth 1.0 mm, length 2.5 mm Incision type |
|BD Microtainer Quikheel Preemie Lancetb ||Low birthweight (>1.0 kg and <1.5 kg) premature infants or full term for lower blood volume ||Pink: depth 0.85 mm, length 1.75 mm Incision type |
|BD Microtainer Genie Lancetb,c ||Infant heelsticks for glucose testing ||Purple: 1.25 mm × 28 gPuncture type |
|BD Microtainer Quikheel Infant Lancetb ||Infants who need high flow, full term with high blood volume needed ||Teal: depth 1.00 mm, length 2.50 mm Incision type |
|babyLance Preemie: BLPd ||Preemie ||Green: depth 0.85 mm Incision type |
|babyLance Newbornd ||Newborn ||Blue: depth 1.00 mm Incision type |
Automated self-shielding lancets are preferred in neonates because they are associated with fewer complications and decreased pain. Automated devices cause less hemolysis and less lab value error, ...
Log In to View More
If you don't have a subscription, please view our individual subscription options below to find out how you can gain access to this content.
Want remote access to your institution's subscription?
Sign in to your MyAccess profile while you are actively authenticated on this site via your institution (you will be able to verify this by looking at the top right corner of the screen - if you see your institution's name, you are authenticated). Once logged in to your MyAccess profile, you will be able to access your institution's subscription for 90 days from any location. You must be logged in while authenticated at least once every 90 days to maintain this remote access.
If your institution subscribes to this resource, and you don't have a MyAccess profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus.
AccessPediatrics Full Site: One-Year Subscription
Connect to the full suite of AccessPediatrics content and resources including 20+ textbooks such as Rudolph’s Pediatrics and The Pediatric Practice series, high-quality procedural videos, images, and animations, interactive board review, an integrated pediatric drug database, and more.
Pay Per View: Timed Access to all of AccessPediatrics
24 Hour Subscription $34.95
48 Hour Subscription $54.95
Pop-up div Successfully Displayed
This div only appears when the trigger link is hovered over.
Otherwise it is hidden from view.