Sign in →

Test Code MET HGB Methemoglobin

Clinical System Name




Met Hb

Sample Requirements

Specimen:  Whole Blood

Container(s): Heparinized Syringe

Preferred Vol: 0.5 mL

Minimum Vol: 2 Heparinized Capillary Blood Gas Tubes. (EPOC capillary tubes are not acceptable).


Note: Ideally, specimens should be analyzed within 10 minutes of drawing and not exposed to air bubbles. Specimens may be run up to 30 minutes after drawing when stored at 2-8°C.

Processing Instructions

Reject due to: Inadequately filled specimens, air bubbles, visible clots, age of specimen

Spin: N

Aliquot: N

Temp: RT

Storage location: Deliver samples to Core Lab gas bench.


Off-site collection:  Sample must be collected at Children's. Please contact Laboratory (206) 987-2102 for additional information.



Specimen Type Temperature Time
Whole blood -  Heparinized Syringe RT ≤ 15 min
Whole blood - Heparinized Syringe Refrigrated 30 min
Whole blood - Heparinized Syringe Frozen No



STAT Performed TAT
Y 24/7 15 min


Performing Laboratory

Seattle Children's Laboratory    


Department:  Chemistry - Core

Phone Number: 206-987-2617

Reference Range

Less than 2% of total hemoglobin.


Method:  Oximetry by SIEMENS RAPIDPOINT 405

Analytical Volume:  0.1 mL of sample for analysis, always use the recommended fill volumes for the sample collection device. This ensures that the system can aspirate sufficient sample for analysis.

CPT Codes