Preanalytical and analytical influences on test
Increased
 Mercury exposure
Aging in older nonsmokers (in serum positive)
Health 2-10% (in serum positive)
Smoking - in young smokers (in serum positive)
Lipemia
Cryoglobulines
Circulating immune complexe
Multiple vacctiations and transfusions have been administered
Drug interference
Biological |
Decreased values: |
|
Increased values: |
 Methyldopa |
Analytical |
Decreased values: |
|
Increased values: |
|
Methyldopa (aldomet) is an antihypertensive drug
Mol. Weight 211.2
Therapeutic conc. 1-7.5 mg/L
Toxic conc 10 mg/L
Elimination Halflife 1.3 hrs
Reference range
Reference values
dependent on method |
Agglutation |
negative (<1:20) |
Nephelometry |
< 40 U/L |
ELISA |
|
IgM RF |
IgA RF |
IgG RF |
Units |
Negative |
< 16 |
< 20 |
< 30 |
U/ml |
Equivocal |
16-24 |
20-30 |
30-40 |
U/ml |
Positive |
> 24 |
> 30 |
> 40 |
U/ml |
|
