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Laboratory Medicine

Test catalogue


Test Name


Green Tube Specimen Type / Requirements

Container Type = 1 Green Tube

Minimum Volume = 2 ml Blood

Tube must fill to at least ½ or greater of its vacuum capacity

Specimen Handling

Collection Instructions: Whole blood samples collected in heparinized syringes or capillary tubes. Samples may be arterial, venous or capillary. Write your initials, date and time of collection on the collection label or requisition.

     • Plastic Syringe Samples: Analyze as soon as possible preferably within 30 mins of collection.

      • Capillary Samples: Analyzed within 5 minutes at room temperature whenever possible.

Lactate, carboxyhemoglobin, and methemoglobin samples collected in heparin (green top) vacutainer analyzed within 30 minutes.

Laboratory Staff Instructions: Plastic syringe samples: Analyze as quickly as possible preferably within 30 minutes of collection at room temperature.

Rejection Criteria: Gross hemolysis, Unlabeled or Not Sufficient Quantity Samples will be rejected.

Stability: Stable at 2 – 8°C for 1 week.

Transportation: Send sample on ice to core lab as soon as possible.

Required Documentation

Turnaround Time (TAT)

30 Mins

Test Utilization

Reference Value

< 0.02

Test Code



CO-Oximetry (Spectrometer/Absorption spectra)

Testing Location


Other Information

Last Updated: September 26, 2019