Details of Element: Calculated Ccx Low Density Lipoprotein
Component of Medical Laboratory

Unique Name: ccldl
Contained in the Common BLSA Data Set ? Yes

Data Points (as of 09/06/98) Males Females Total
Number of Data Points 1999 1732 3731
Number of Distinct Participants 749 707 1456
Year First Collected 1991 1991 -
Year Last Collected 1998 1998 -

Type of Variable: Absolute Measure
Encoding: Continuous
Units of Measure: MG/DL
Precision: ###.
Anticipated Range: 050. thru 600.
Masterfile Index: 002-04-52
Related Data Elements: none
Specific to this Data Element:
    Descriptive history:
    Low density lipoproteins (also know as LDL-cholesterols) are calculated from the Freidwald equation based on concentrations of cholesterol, triglyceride and high density lipoprotein. LDL-cholesterols have been entered continuously since 1983. During this time, different methods have been used to provide the LDL-cholesterol values. calculated low density lipoprotein (ldl)' refers to computations made at the GRC (see description of low density liporotein (ldl)' -- file 002, card 4). From 1991 to the present, LDL-cholesterol levels have been calculated from plasma using Abbott-CCX.

    LDL-cholesterol (see above) measured in different sample types and with different methodologies are not equivalent. The calculated low density lipoprotein' values in this file are entered as is. Longitudinal and cross-sectional analyses made over time periods where changes occurred in the methodology require adjustment to achieve consistancy (for more information please contact investigators).

    Data collection methodology:
    Blood chemistry.

    Related protocols:
    Other blood chemistries.

    Investigators:
    Dr. Reubin Andres (primary investigator)
    GRC Box-24
    andresr@grc.nia.nih.gov
    (410)-558-8194

    Frequency of data collection:
    Every visit.

    Inclusion/exclusion rules:
    None.

    Publications using these data:
  • Hallfrisch, J., Singh, V.N., Muller, D.C., Baldwin, H., Bannon, M.E., Andres, R. High plasma vitamin C associated with high plasma HDL- and HDL2 cholesterol. Am J Clin Nutr. 60(1): 100-5,1994.
Details for this Data Type
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Revised 09/18/98 -- Send comments to our Web Master .