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Test Code (รหัสการทดสอบ):
BILI

Order Name (ชื่อการทดสอบ):
Total Bilirubin

 
Specimen / Container (สิ่งส่งตรวจ/ภาชนะ):
Blood/ Plain blood (Red top) 6 mL, 1 tube
 
Turnaround Time (ระยะเวลารอผล):
Collected specimen to report within 1.5 hours (90 mins)
 
Useful For (ประโยชน์การทดสอบ):
  1. Assessing liver function.
  2. Evaluating a wide range of diseases affecting the production, uptake, storage, metabolism, or excretion of bilirubin.
  3. Monitoring the efficacy of neonatal phototherapy
 
Methodology (วิธีการทดสอบ):
Diazonium Salt
 
AliasesName (ชื่อเรียกอื่นๆ) :
T-Bil
 
 
 
Test Code (รหัสการทดสอบ):
BILI

Order Name (ชื่อการทดสอบ):
Total Bilirubin

 
Collection Specimen Or Container (สิ่งส่งตรวจ/ภาชนะ):
Blood/ Plain blood (Red top) 6 mL, 1 tube
 
Specimen Testing Type (สิ่งส่งตรวจที่ใช้ในการทดสอบ):
Serum, minimum volume 0.5 mL
 
Sub Mission Container (ภาชนะส่งตรวจ):
Plastic vial
 
Rejection Criteria (เกณฑ์ปฏิเสธสิ่งส่งตรวจ):
Hemolysis: 4+ reject
 
Specimen Stabillity (ความคงตัวของสิ่งส่งตรวจ):
Specimen Type Temperature Time
Serum Refrigerated, 2oC to 8oC 7 days
Frozen, -20oC 6 months
 
 
 
Test Code (รหัสการทดสอบ):
BILI

Order Name (ชื่อการทดสอบ):
Total Bilirubin

 
Method detail (วิธีการทดสอบ):
Diazonium Salt
 
Schedule (ตารางการทดสอบ):
Tested daily (24 hours)
 
Turnaround Time (ระยะเวลารอผล):
Collected specimen to report within 1.5 hours (90 mins)
 
Performing Location (หน่วยงานที่ทำการทดสอบ):
Chemistry, Laboratory Department Tel. 13224
 
Specimen Retention Time (ระยะเวลาเก็บสิ่งส่งตรวจ):
5 days
 
 
 
Test Code (รหัสการทดสอบ):
BILI

Order Name (ชื่อการทดสอบ):
Total Bilirubin

 
 
Clinical Information (ข้อมูลทางคลินิก):
Red blood cells at the end of their circulating lives are broken down in the reticuloendothelial system, mainly the spleen. The resulting heme is converted to bilirubin upon removal of iron. This process accounts for about 80% of the 500 μmol (292 mg) of bilirubin formed daily. Other sources of bilirubin include the breakdown of myoglobin and cytochromes and the catabolism of immature red blood cells in the bone marrow.

Once formed, bilirubin is transported to the liver bound to albumin. This fraction of bilirubin is referred to as indirect or unconjugated bilirubin. In the liver, bilirubin is conjugated to glucuronic acid (mono- and diglucuronides) by the enzyme uridyl diphosphate glucuronyl transferase to form conjugated bilirubin. Conjugated bilirubin or direct bilirubin is excreted via the biliary system into the intestine, where it is metabolized by bacteria to a group of products known collectively as stercobilinogen. Elimination is almost complete and serum levels are normally negligible. Total bilirubin is the sum of the unconjugated and conjugated fractions. Total bilirubin is elevated in hepatitis, cirrhosis, hemolytic disorders, several inherited enzyme deficiencies, and conditions causing hepatic obstruction.

Neonatal bilirubin quantitation is used to monitor diseases causing jaundice in the newborn, chiefly erythroblastosis fetalis (also called hemolytic disease of the newborn or HDN). HDN is caused by maternal alloimmunization to RhD, antibodies involving additional blood groups, and ABO incompatibility. The average full-term newborn infant has a peak serum bilirubin concentration of 5 to 6 mg/dL (86 to 103 μmol/L). Physiologic jaundice is seen at serum bilirubin concentrations from 7 to 17 mg/dL (120 to 291 μmol/L). Serum bilirubin concentrations greater than 17 mg/dL may be pathologic. The primary concern is the potential for bilirubin encephalopathy or kernicterus. The term “kernicterus” was introduced in the early 1900s to refer to the yellow staining of the basal ganglia observed in infants who died with severe jaundice. Additional causes of neonatal jaundice are hematoma/hemorrhage, hypothyroidism, Crigler-Najjar syndrome, obstructive jaundice, galactosemia, sepsis, syphilis, toxoplasmosis, cytomegalovirus, rubella, glucose-6-phosphate dehydrogenase (G-6-PDH) deficiency, pyruvate kinase deficiency, and spherocytosis.
 
Reference Value (ค่าอ้างอิง):
0.2 – 1.5 mg/dL
 
Interpretation (การแปลผล):
The level of bilirubinemia that results in kernicterus in a given infant is unknown. While central nervous system damage is rare when total serum bilirubin (TSB) is less than 20 mg/dL, premature infants may be affected at lower levels. The decision to institute therapy is based on a number of factors including TSB, age, clinical history, physical examination and coexisting conditions. Phototherapy typically is discontinued when TSB level reaches 14 to 15 mg/dL.

Physiologic jaundice should resolve in 5 to 10 days in full-term infants and by 14 days in preterm infants.

In preterm infants, the risk of a handicap increases by 30% for each 2.9 mg/dL increase of maximal total bilirubin concentration.

When any portion of the biliary tree becomes blocked, bilirubin levels will increase.
 
Clinical Reference (เอกสารอ้างอิง):
  1. Manufacturer’s reagent package insert, Architect® Total Bilirubin, Abbott Laboratories, Abbott Park IL 60064 USA, November 2016.
  2. http://www.mayomedicallaboratories.com (Retrieved: 01 Jan 2019)