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Cooximetry

Item Value
Approval req'd? No
Available Stat? No
Test code CPCOOX (Capillary source)
Blood Gas with Cooximetry:
ABGCOX (Blood Gas and Cooximetry from Arterial source)
VBGCOX (Blood Gas and Cooximetry from Venous source)
MVBGCX (Blood Gas and Cooximetry from Mixed Venous source)
CVBGX(Blood Gas and Cooximetry from Mixed Venous source)
Performed by Blood Gas Laboratory, Parnassus and Mission Bay
In House Availability Test available 24 hours per day 7 days per week
Method Radiometer ABL 800
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 station #916, 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 Blood Gas Laboratory, 15th floor, Moffitt bldg. Rm 1577. MB Blood Gas Lab is in the Children's Hospital, 3rd floor, RM C363
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
Sample type Heparinized whole blood (Blood gas syringe or capillary tube)
Preferred volume 1 mL blood
Min. Volume 0.5 mL blood
UCSF Rejection Criteria Samples submitted > 30 min. after collection. Samples with needle attached, containing large bubbles, unlabeled, mislabeled, clotted or of insufficient volume for testing.
Units %
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
Critical value
Carboxyhemoglobin ≥ 5%
Methemoglobin ≥ 2%
Synonyms Hemoximetry; Methemoglobinemia; Oxyhemoglobin; Carboxyhemoglobin; Deoxyhemoglobin
Turn around times 15 minutes
Additional information Testing is performed by the Blood Gas Lab, Parnassus M1577 and MB Blood Gas Lab C3636.

Heparin syringes and caps to replace the needles during transport to the laboratory are available from Materiel Services.
LOINC code 11559-2
Last Updated 11/30/2016 10:24:17 AM
Entry Number 469
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