To test magnesium levels, a green-top tube containing lithium heparin is typically used for plasma samples. Alternatively, a red-top tube may be used for serum samples. It's essential to follow specific laboratory protocols, as practices can vary between institutions. Always consult your lab's guidelines for the correct tube type.
A lavender or purple-topped tube is typically used for a magnesium blood draw.
The color traditionally used to represent magnesium (Mg) is light silver or gray. A top tube in this color would be suitable for drawing a sample for magnesium testing.
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The color tube most commonly used for magnesium testing is a lavender or purple-stoppered tube, which typically indicates it is an ethylenediaminetetraacetic acid (EDTA) tube. This additive helps to preserve the sample and prevent clotting.
A dark green or light green tube is typically used to draw magnesium levels. These tubes contain heparin as an anticoagulant, which is suitable for plasma testing. Always check specific laboratory protocols, as practices may vary.
red tube
Green
A green-top tube containing lithium heparin or a royal blue-top tube containing no additive is typically used for magnesium tests. The specific tube type may vary depending on the laboratory's preferences.
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Red
A lavender/purple top tube is typically used for collecting blood specimens for phenobarbital level testing. This tube contains EDTA as an anticoagulant.
A lavender-top tube should be used to collect a fasting prolactin level sample.