Item Value
Test name Cooximetry (Complete View)
Available Stat? Yes
Turn around times 10 minutes
In House Availability Test available 24 hours per day 7 days per week
Performed by Parnassus Chemistry and Mission Bay Blood Gas Laboratory
Normal range
Hemoglobin see Hemoglobin entry
Oxyhemoglobin 93-100%
Carboxyhemoglobin 0.5-1.5%
Methemoglobin 0.0-1.5%
Oxygen saturation 95-99%
Art. O2 content: 16-22 vol%
A-V DO2 3.5-5 vol%
A-a DO2 varies with FiO2
Container type Plastic syringe containing 100 U of dry heparin or Capillary Tube with 70 IU/ml dry electrolyte-balanced heparin
Amount to Collect 1 mL blood
Collection Instructions Heparin syringes and caps to replace the needles during transport to the laboratory are available from Materiel Services

Specimens should be sent at ambient temperature via pneumatic tube to Blood Gas Lab, Parnassus Chemistry station #151, Mission Bay station # 21, within 30 minutes of collection.

Capillary Samples:
1. The following are recommended sampling sites: earlobe, fingertip, big toe, heel. The heel and big toe are more suitable for use on neonates and infants.
2. Warm the area or puncture site for 5 to 10 minutes prior to actual sampling. This accelerates flow for blood to be representative of general status of patient.
3. Make a puncture using a lancet or similar device. Do not squeeze the area to avoid tissue juice from mixing into blood sample.
4. Wipe off the first drop of blood. Take the sample from the center of the second drop of blood and hold the capillary at a slightly downward angle for an uninterrupted blood flow. Avoid getting air bubbles in the specimen.
5. Refrain from squeezing or milking the puncture site as this may result in faulty measurements or cause hemolysis of blood sample and cause elevated K+ readings.
6. Apply accompanying caps to both ends of the capillary tube and mix the sample with the heparin immediately after collection to prevent blood from clotting. The manufacturer recommends the use of a mixing wire and magnet for capillary samples.
7. Label sample with patient's name, ID and DOB.


Hand deliver all capillary samples to the Blood Gas Lab immediately (within 10 minutes) after collection. Send samples to Parnassus Chemistry 5th floor Long hospital room L568, MB Blood Gas Lab is in the Children's Hospital, 3rd floor, RM C3636
Sample type Heparinized whole blood (Blood gas syringe or capillary tube)

If you have additional questions regarding this test, please call: 415-353-1667