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Test Code CRBXQ Carboxyhemoglobin, Blood

Specimen Required

One Full Tube of whole blood. Keep tube closed.

Specimen Minimum Volume

0.5 mL

Specimen Stability

Room temperature: 5 days Refrigerated: 10 days Frozen: Unacceptable

Rejection Due To

Fluoride oxalate (gray-top) tube • Grossly clotted

Report Available

Next day

Method Name

Spectrophotometry (SP)

Collection Container / Tube

Preferred: EDTA (Lavendar Top)
Other Acceptable Container: Sodium or lithium heparin (green-top), or sodium fluoride (gray-top) tube

Transport / Storage Conditions

Room temperature

Special Instructions

After blood collection, keep tube closed

Reference Values

Non-Smoker <2 % of total Hgb
Average Smoker  4-5 % of total Hgb
Heavy Smoker 8-12 % of total Hgb

Day(s) Performed

Daily nights

CPT Codes


Alias/See Also



After blood collection, keep tube closed