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Pre-filled, small (e.g., 1 mL), and calibrated syringes that end in a Luer lock tip and that are supplied filled with a saline solution containing a specific blood albumin tracer (e.g., iodine isotope 131, I131). These syringes are specially designed (sometimes with a stop cock instead of a plunger) to inject an accurate dose of several microcuries (typically 10 to 25) through an intravenous line; they are used for blood and blood component (e.g., red cells, plasma) volume measuring from blood samples taken after the tracer injection using a semi-automated or automated analyzer.
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