Test Details
Methodology
Colorimetric
Result Turnaround Time
Within 1 day
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Use
Causes of high bilirubin: Liver disease: hepatitis, cholangitis, cirrhosis, other types of liver disease (including primary or secondary neoplasia); alcoholism (usually with high AST (SGOT), GGT, MCV, or some combination of these findings); biliary obstruction (intrahepatic or extrahepatic); infectious mononucleosis (look also for increased LD (LDH), lymphocytosis); Dubin-Johnson syndrome; Gilbert disease1 (familial hyperbilirubinemia) is encountered as a moderate elevation with otherwise unremarkable chemistries.
Anorexia or prolonged fasting: 36 hours or more may cause moderate rise.
Pernicious anemia, hemolytic anemias, erythroblastosis fetalis, other neonatal jaundice, hematoma, and following a blood transfusion, especially if several units are given in a short time.
Pulmonary embolism and/or infarct, congestive heart failure.
Drugs: A large number of drugs can cause jaundice by in vivo action or by chemistry methodology. Drugs causing cholestasis and/or hepatocellular damage include diphenylhydantoin, azathioprine, phenothiazines, erythromycin, penicillin, sulfonamides, oral contraceptives, anabolic-androgenic steroids, halothane, aminosalicylic acid, isoniazid, methyldopa, indomethacin, pyrazinamide, and others.
Custom Additional Information
Interpretation of increased bilirubin is greatly enhanced by other chemistry results. In acute viral hepatitis with jaundice, for instance, the transaminases ALT (SGPT) and AST (SGOT) are consistently increased, while an isolated elevation of bilirubin is seen in Gilbert disease.1 Obstruction causes increases in bilirubin and alkaline phosphatase greater than and out of proportion to the transaminases.2 Amylase and lipase are useful in differential diagnosis of obstructive jaundice. In intrahepatic cholestasis, the transaminases are not as increased, relative to bilirubin, as they are in hepatitis.3 Work-up of jaundice has been outlined.4,5
Nicotinic acid increases the formation of bilirubin in the spleen, leading to a rise in unconjugated bilirubin. This can be used as a test for Gilbert disease1 in which there is a decreased hepatic clearance of unconjugated bilirubin. Although the indirect bilirubin level is increased in normal controls when nicotinic acid is given, the increase is much greater in patients with Gilbert disease. In the Crigler-Najjar syndrome type I, the unconjugated bilirubin is >20 μg/dL. In type II, the level is <20 μg/dL.
Specimen Requirements
Specimen
Serum (preferred) or plasma
Volume
1 mL
Minimum Volume
0.7 mL (Note: This volume does not allow for repeat testing.)
Container
Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Do not use oxalate, EDTA, or citrate plasma.
Collection Instructions
Separate serum or plasma from cells within 45 minutes of collection.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 3 days |
Refrigerated | 3 days |
Frozen | 14 days |
Freeze/thaw cycles | Stable x2 |
Reference Range
See table.
Age | Range (mg/dL) |
|---|---|
Newborns, term, and near term | |
24 hours | 0.0−8.0 |
48 hours | 0.0−13.2 |
72 hours | 0.0−15.6 |
96 hours to 1 month | 0.0−16.6 |
Children ≥1 month and adults | 0.0−1.2 |
Storage Instructions
Room temperature
Causes for Rejection
Gross hemolysis; improper labeling; gross lipemia
Footnotes
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 001099 | Bilirubin, Total | 1975-2 | 001099 | Bilirubin, Total | mg/dL | 1975-2 |
| Order Code | 001099 | |||||
| Order Code Name | Bilirubin, Total | |||||
| Order Loinc | 1975-2 | |||||
| Result Code | 001099 | |||||
| Result Code Name | Bilirubin, Total | |||||
| UofM | mg/dL | |||||
| Result LOINC | 1975-2 |