Nursing Central: Bilirubin and Bilirubin Fractions

Bilirubin and Bilirubin Fractions

General

Synonym/Acronym:
Conjugated/direct bilirubin, unconjugated/indirect bilirubin, delta bilirubin, TBil.

Common Use:
A multipurpose lab test that acts as an indicator for various diseases of the liver or for disease that affects the liver.

Specimen:
Serum (1 mL) collected in a red- or tiger-top tube. Plasma (1 mL) collected in green-top (heparin) tube or in a heparinized microtainer is also acceptable. Protect sample from direct light.

Normal Findings:
(Method: Spectrophotometry) Total bilirubin levels in infants should decrease to adult levels by day 10 as the development of the hepatic circulatory system matures. Values in breastfed infants may take longer to reach normal adult levels. Values in premature infants may initially be higher than in full-term infants and also take longer to decrease to normal levels.

Bilirubin	Conventional Units	SI Units (Conventional Units × 17.1)
Total bilirubin
Newborn–1 day	Less than 5.8 mg/dL	Less than 99 micromol/L
1–2 days	Less than 8.2 mg/dL	Less than 140 micromol/L
3–5 days	Less than 11.7 mg/dL	Less than 200 micromol/L
6–7 days	Less than 8.4 mg/dL	Less than 144 micromol/L
8–9 days	Less than 6.5 mg/dL	Less than 111 micromol/L
10–11 days	Less than 4.6 mg/dL	Less than 79 micromol/L
12–13 days	Less than 2.7 mg/dL	Less than 46 micromol/L
14–30 days	Less than 0.8 mg/dL	Less than 14 micromol/L
1 mo–older adult	Less than 1.2 mg/dL	Less than 21 micromol/L
Unconjugated bilirubin	Less than 1.1 mg/dL	Less than 19 micromol/L
Conjugated bilirubin
Neonate	Less than 0.6 mg/dL	Less than 10 micromol/L
29 days–older adult	Less than 0.3 mg/dL	Less than 5 micromol/L
Delta bilirubin	Less than 0.2 mg/dL	Less than 3 micromol/L

Bilirubin and Bilirubin Fractions has been found in Davis's Lab & Diagnostic Tests

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