How To Do Venous Blood Sampling - The Merck Manuals
https://www.merckmanuals.com/professional/critical-care-medicine/how-to-do-peripheral-vascular-procedures/how-to-do-venous-blood-sampling
WEBPeripheral veins, typically the antecubital veins, are the usual sites for venous blood sampling. Ultrasound guidance, when equipment and trained personnel are available, can facilitate blood sampling from deep, nonpalpable veins. (See also Vascular Access.) Indications for Venous Blood Sampling. Need for a venous blood sample for laboratory study.
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