Common Laboratory (LAB) Values [ M - N - O ]

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 N   O   P   Q   R   S   T   U   V   W   X   Y   Z 

< M - N - O >

Lab (Specimen)

Conventional Units

SI Units

Magnesium (serum)

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1.5 - 2.4 mEq/L

Critical value:
<1.0 mEq/L and >4.7 mEq/L
 0.75 - 1.2 mmol/L

Critical value:
<0.5 mmol/L
    and >2.35 mmol/L
Mercury (blood)
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< 1 µg/dL < 50 nmol/L
Methemoglobin (blood)
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<2% of total Hb <0.02 of total Hb
Myelin basic protein (CSF)
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<4 ng/mL <4 µg/L
Myoglobin (serum)
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< 55 ng/mL <55 µg/L
Osmolality (serum)
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278 - 305 mOsm/kg 278 - 305 mmol/kg
Osmolality (urine)
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50 - 1200 mOsm/kg 50 - 1200 mmol/kg
Oxalate (urine)
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leq 40 mg/day leq 456 µmol/day

Important Notes  top of page icon

>Unless noted, all values are for adults.
>All laboratory values listed are method dependent (Methods include: immunoassay, colorimetry, electrophoresis, HPLC, etc).
>Values may vary between laboratories.


Basic Skills in Interpreting Laboratory Data, 5th Ed. (2013) Lee M (editor). American Society of Health-System Pharmacists, ISBN 1585283436.

Drug information handbook: a comprehensive resource for all clinicians and healthcare professionals, 24th Ed. (2015) Lexi-Comp

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