68973-7
LOINC Code
| LOINC code | 68973-7 | |
|---|---|---|
| name | ||
| description | Note that both the numerator and denominator are concentration of the same protein in the CSF, ..BUT the denominator is the total CSF concentration and the numerator is the contribution of the protein in the CSF that is MADE IN THE CSF (i.e. "intrathecally") ---as opposed to protein that has diffused in from the blood. The calculation is IgX(Intracthecal fraction) = [IgX(Intrathecally synthsized concentration)/IgX(Total CSF Concentration)]*100 from "Multiple Sclerosis (1998) 4, 111 - 117" From the same paper, the "IgX(Intrathecally synthsized concentration)" is complex to determine, but is based on the amount of protein in the CSF over and above that of the normal upper limit expected in the CSF (compared to that in blood). That 'over and above' amount is what is deemed to be produced in the CSF, which is the "Intrathecal Fraction"...... Same theme repeats in other papers (e.g. Am. J. Trop. Med. Hyg., 82(6), 2010, pp. 1094-1098) | |
| status | ACTIVE | |
Fully-Specified Name | ||
| component | IgA.intrathecally synthesized/IgA.total | |
| property | MFr = Mass Fraction | |
| time | Pt = Point in time: To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements. | |
| system | CSF = Cerebral spinal fluid | |
| scale | Qn = Quantitative: The result of the test is a numeric value that relates to a continuous numeric scale. Reported either as an integer, a ratio, a real number, or a range. The test result value may optionally contain a relational operator from the set {<=, <, >, >=}. Valid values for a quantitative test are of the form "7", "-7", "7.4", "-7.4", "7.8912", "0.125", "<10", "<10.15", ">12000", 1-10, 1:256 | |
| method | ||
Additional Names | ||
| short name | Cerebral spinal fluid; Cerebrospinal Fl; Chemistry; IgA intrathecally produced; IgA.IT; Immune globulin A; Immunoglobulin A; Intrathecal; Mass fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spi | |
Basic Attributes | ||
| class | CHEM | |
| type | 1 Laboratory | |
| order vs. observation | IgA.IT MFr CSF | |
| formula (readable) | IgA(Intracthecal fraction) = [IgA(Intrathecally synthsized concentration)/IgA(Total CSF Concentration)]*100 | |
| example UCUM units | % The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business (www.unitsofmeasure.org) | |
History/Usage | ||
| first released | ||
| last updated | 2.83 | |
| last change type | MIN - change to field other than name | |
| change reason | % | |
Related Names | ||
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