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Test ID: P50    
Oxygen Dissociation, P50, Erythrocytes

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Specimen Type Describes the specimen type needed for testing

WB Sodium Heparin

Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.

See Recommendations for Collection of Control Specimens in Special Instructions.


Specimens must arrive within 72 hours of draw.


A whole blood sodium heparin specimen and a control specimen are required.



Container/Tube: Green top (sodium heparin)

Specimen Volume: 5 mL

Collection Instructions:

1. Immediately refrigerate specimens after draw.

2. Do not transfer blood to other containers.

3. Rubber band patient specimen and control vial together.

Additional Information: Patient's age and sex are required.

Forms: If not ordering electronically, please submit a Hematopathology/Molecular Oncology Request Form (Supply T241) with the specimen.


Normal Control:

Container/Tube: Green top (sodium heparin)

Specimen Volume: 5 mL

Collection Instructions:

1. Draw a control specimen at the same time from a normal, unrelated, non-smoking individual.

2. Clearly write normal control on outermost label.

3. Immediately refrigerate specimens after draw.

4. Do not transfer blood to other containers.

5. Rubber band control vial and patient specimen together.

Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.

1 mL

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected








No control vial sent, lithium heparin tube

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.

Specimen TypeTemperatureTime
ControlRefrigerated72 hours
WB Sodium HeparinRefrigerated72 hours