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Serum-separating tube (SST): Tube inversions promote clotting. Most chemistry, endocrine and serology tests, including hepatitis and HIV. Orange Clot activator and serum separating gel [5] Rapid serum-separating tube (RST). Dark green Sodium heparin (anticoagulant) Chromosome testing, HLA typing, ammonia, lactate: Light green Lithium heparin ...
Vacutainer tubes may contain additives designed to stabilize and preserve the specimen prior to analytical testing. Tubes are available with a safety-engineered stopper, with a variety of labeling options and draw volumes. The color of the top indicates the additives in the vial. [1] Vacutainer tubes were invented by Joseph Kleiner in 1949. [2]
These tubes should be used with care when measuring drug or hormone levels because the drug or hormone may diffuse from the serum into the gel, causing a reduction in measured level. The gel in SST II tubes (which appears slightly less opaque) is supposed [ weasel words ] to have less effect on drug levels in serum.
There are several ways to measure glycated hemoglobin, of which HbA1c (or simply A1c) is a standard single test. [5] HbA1c is measured primarily to determine the three-month average blood sugar level and is used as a standard diagnostic test for evaluating the risk of complications of diabetes and as an assessment of glycemic control .
Normal A1C for people without diabetes is below 5.6 percent, Dr. Peterson says. Levels between 5.7 percent and 6.5 percent suggest prediabetes, and an A1C of 6.5 percent or higher puts you in the ...
These tubes are commonly sealed with a rubber stopper and often have a specific additive placed in the tube with the stopper color indicating the additive. For example, a blue-top tube is a 5 ml test tube containing sodium citrate as an anticoagulant, used to collect blood for coagulation and glucose-6-phosphate dehydrogenase testing. [5]
Nessler cylinders (also named color comparison cylinders or color comparing cylinders) are laboratory tubes with a fixed volume, made of glass with optically plane bottom. On the walls, there are marks of the nominal stroke volume (usually 100 ml) and possibly one halfway mark (usually 50 ml).
Here's when and how to safely thaw a frozen turkey for Thanksgiving, including methods for thawing in the refrigerator or a water bath.
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