Useful as an indicator of in vivo breakdown of hemoglobin to differentiate cerebral hemorrhage from a traumatic tap.
- Patient Preparation
- CSF. Collect at least 12 hours after suspected hemorrhage. Use the last (ideally the fourth) specimen post lumbar puncture. AND serum separator tube.
- Specimen Preparation
- CSF: Transport to local lab quickly and avoid pneumatic tube transport if possible. Protect from light during collection, storage and shipment. Centrifuge for 5 minutes ASAP or within 1 hour of collection. Transfer 2 mL CSF to an ARUP Amber Transport Tube. (Min: 1 mL) Do not freeze.
Serum: Protect from light during collection, storage and shipment. Allow specimen to clot completely at room temperature. Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Amber Transport Tube. (Min: 0.5 mL)
- Storage/Transport Temperature
- Unacceptable Conditions
- Specimens not protected from light. Frozen CSF.
- CSF: Ambient: 4 hours; Refrigerated: 1 week; Frozen: Unacceptable
Serum: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 6 months
|Test Number||Components||Reference Interval|
| ||Net Absorbance, Bilirubin, CSF||Effective July 18, 2011 |
0.007 AU or less
| ||Net Absorbance, Oxyhemoglobin, CSF||Effective July 18, 2011 |
0.020 AU or less
|0020032||Bilirubin, Total, Serum or Plasma||By report|
|Component Test Code*||Component Chart Name||LOINC|
|2005249||Net Absorbance, Bilirubin, CSF|
|2005250||Net Absorbance, Oxyhemoglobin, CSF|