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The SARS-CoV-2 Total Antibody Spike Semi-Quantitative Test detects antibodies to the COVID-19 spike protein, indicating an adaptive immune response from recent or prior infection. Vaccinated individuals may also test positive, though results should not be used to assess immunity or protection. Doctors use this blood test to confirm past exposure, but it is not designed to diagnose active infection or predict reinfection risk.
The Very Long Chain Fatty Acids (VLCFA) Test measures C22:0, C24:0, C26:0 and ratios (C24/C22, C26/C22), with phytanic and pristanic acids, by GC/MS to assess peroxisomal function. Abnormal VLCFAs support evaluation of X-linked adrenoleukodystrophy and Zellweger spectrum disorders, informing diagnosis of peroxisomal and neuro-metabolic disease in the right clinical context.