Comments
Marjorie Rauch
said on
January 07, 2010
What would cause a no reading on my LDL test?
It was taken twice without getting a result. Should I be concerned?
Delores
said on
January 11, 2010
how often are the test/screening are need
April Anaya, Laboratory Supervisor
said on
January 16, 2010
Marjorie,
Thank you for your question regarding your LDL test reading.
LDL is a calculated value derived from your total cholesterol, HDL and triglyceride measurements using a common standardized calculation that most labs use to report LDL results.
LDL = TC – HDL – (TRG/5)
The calculation is limited by the range of values the Cholestech LDX is able to measure. If one of the values required for the calculation falls outside the analyzer’s measuring range (listed below), LDL cannot be calculated because there is not an exact number to plug into the calculation. This is not a problem with the test, but rather a common limitation of most cholesterol tests.
The blood machines we use can only detect levels between the ranges below:
TC = 100 – 500 mg/dL
HDL = 15 – 100 mg/dL
TRG = 45 – 650 mg/dL
GLU = 50 – 500 mg/dL (not used to calculate LDL)
*Note: a TC, HDL or TRG result that falls outside the measuring range will also yield “NA” for TC/HDL and non-HDL, which are also calculations.
Guy Lemire, MD, FRCS (C), FACS (THOR)
said on
February 04, 2010
Delores - This is a personal decision based on your risk factors and previous screening results. Many of our customers choose to have annual screenings as part of their regular healthcare regimen.
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