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Test Code MetHB Methaemoglobin

Important Note

Therapeutic levels (1 mg/mL and 2 mg/mL) of Hydroxocobalamin may interfere with MHB assay. Do not expose specimen to air. Specimen should be completely without air bubbles. Mix sample well to prevent clotting. Chill specimen and send to laboratory immediately.

Additional Codes

Epic Ordering Code LAB91
NBS code LBC00659
Service code 32315

Specimen Requirements

Submit only one of the following:

Preferred: Acceptable:
Heparinized Syringe Capillary

 

Processing Requirements

Place specimen on ice and send to laboratory immediately. 

Specimen type: Whole Blood

Volume: 1mL

Specimen Stability

Specimen Type Whole Blood
Ambient Reject
Refrigerate 5 mins (ice slurry)
Frozen Reject

Specimen Condition

Haemolysis Not applicable
Icterus Not applicable
Lipaemia Not applicable
Others: Sample not sent in ice, sample not sealed, bubbles present in sample, clotted sample Not applicable

Methodology

CO-oximetry

Days and Times Performed

24 hrs, TAT 1 day

Reference Interval

0.0 – 2.0 %

Testing Laboratory

National University Hospital

Clinical Chemistry, 67724346

Useful For

Diagnosis of methemoglobinemia.

Update

Last updated 26/07/2026

LOINC Code Information

2615-3

Alias

MET

Methemoglobinemia