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Although hyperviscosity is the proximate cause of the complications associated with polycythemia, there are no reliable viscometers in current clinical use. Hence, the venous hematocrit (Hct) value is used as a surrogate marker for viscosity. Hct measured from capillary blood (most often obtained through "heelsticks" in newborn infants) is usually the first-line laboratory measure with which polycythemia is identified. However, simultaneous capillary and venous Hct determinations have shown that these two values are often discordant with capillary values, consistently exceeding venous values by as much as 10%. [15] Therefore, in most situations, a high capillary Hct result should be confirmed with a venous Hct measurement before decisions regarding clinical management are made for newborn infants. A diagnosis of polycythemia can be made using venous hemoglobin or hematocrit (Hct) values. The following laboratory tests may also need to be obtained in infants diagnosed with po

Polycythemia of the Newborn Workup: Approach Considerations, Laboratory Studies, Imaging Studies [{domaincategory=emedicine, pagename=emedicine, sspid=null, sspname=null, sspurl=null, locale=en_us, ddname=null, ddshow=0, ddorder=null, headeroverride=null, footeroverride=null}] --> close Please confirm that you would like to log out of Medscape. If you log out, you will be required to enter your username and password the next time you visit. Log out Cancel processing.... Tools & Reference > Pediatrics: Cardiac Disease and Critical Care Medicine Polycythemia of the Newborn Workup Updated: Sep 24

Bệnh đa hồng cầu ở trẻ sơ sinh: Cân nhắc tiếp cận, nghiên cứu trong phòng thí nghiệm, nghiên cứu hình ảnh

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