metHb


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metHb

Abbreviation for methemoglobin.

methaemoglobin

A haemoglobin that results when oxyhaemoglobin in a ferrous (Fe2+) state is transformed into a ferric (Fe3+) state, which cannot transport O2. Low levels of methaemoglobin are always present in the circulation, but markedly increase after exposure to certain anaesthetics, benzocaines, nitrates, nitrites, phenacetin, etc., resulting in methaemoglobinaemia.
 
Ref range
• Normal, < 3% total MetHb.
• Cyanosis, 10–20% MetHb.
• Anoxia > 30% MetHb.

Specimen
Serum in sodium heparin (green top tube).
 
Method
Spectrophotometry.

metHb

Abbreviation for methemoglobin.

MetHb

methemoglobin.

metHb

methemoglobin.
References in periodicals archive ?
The dose of prilocaine and the age of the infant are the most important predictive factors for higher MetHb formation (7).
Although metHb absorbance at 660 nm is similar to that of HHb, metHb absorbance at 940 nm is markedly greater than that of either HHb or [O.
Manifestations of Methb may include cyanosis, headache, nausea, vomiting, and dizziness; the syndrome usually is not fatal.
Increased temperature causes oxidation of hemoglobin to MetHb ([Fe.
Reacciona con la desoxiHb y la oxiHb para formar nitrosilHb (HbNO) y metHb mas nitrato, respectivamente.
Lower NADH-dependent MetHb reductase activity (the enzyme that converts MetHb to Hb).
2] and MetHb causes moderate underestimation in the higher S[O.
Repeat electrocardiograms remained unchanged, and CO-oximetry 12 h after admission showed a MetHb value of 0.
The effects of the addition of bilirubin, metHb, or oxyHb on the native bilirubin concentrations in these 10 AFs are shown in Table 1.
Two pools of red blood cells were formed, one with a nominal MetHb value of 0% and the other with a nominal value of 100% [prepared with potassium nitrite, as outlined previously (12, 13)].
To reduce metHb and to suppress autooxidation during oxygen-equilibrium studies, the metHb reducing system prepared according to the method of Hayashi et al.