How many standard limb leads are used in a basic ECG procedure?
3
A standard 12-lead ECG records three standard (bipolar) limb leads — Lead I, Lead II and Lead III — which form Einthoven's triangle around the heart.
In addition there are three augmented unipolar limb leads (aVR, aVL, aVF) and six precordial chest leads (V1–V6), but the standard limb leads themselves are only three.
Hence, 3.
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