A method for positioning of six ECG electrodes for precordial leads V1-V6 on a human subject based on the subject's body height, characterised in that the method comprises the steps of (i) determining the horizontal level of the electrodes for leads V4, V5 and V6 (102, 703), wherein the horizontal level (102, 703) is determined to be between (0.088 x body height) [cm] and (0.092 x body height) [cm] downwards from the sternal notch along the sternal midline (101, 702); (ii) marking the position of the electrode for lead V1 (104, 708) from 2.8 cm to 3 cm above the horizontal level (102, 703) along the sternal midline (101, 702), and from 2.9 cm to 3.5 cm to the subject's right from the sternal midline (101, 702); (iii) marking the position of the electrode for lead V2 (105, 709) from 2.8 cm to 3 cm above the horizontal level (102, 703) along the sternal midline (101, 702), and from 2.9 cm to 3.5 cm to the subject's left of the sternal midline (101, 702); (iv) marking the position for the electrode for lead V4 (107, 704) at the horizontal level (102, 703) and (body height/16) ± 1 [cm] to the subject's left from the sternal midline (101, 702) along the surface of the thorax; (v) marking the position for the electrode for lead V3 from (0.023 x body height) [cm] to (0.025 x body height) [cm] from the position of the electrode for lead V2 (105, 709) to the direction of the position for the electrode for lead V4 (107, 704) along the connecting line formed by the position of the electrode for lead V2 (105, 709) and the position of the electrode for lead V4 (107, 704); (vi) marking the position for the electrode for lead V5 at the horizontal level (102, 703) and ((3 x body height)/32) ± 1 [cm] to the subject's left from the sternal midline (101, 702) along the surface of the thorax; (vii) marking the position for the electrode for lead V6 at the horizontal level (102, 703) and (body height/8) ± 1 [cm] to the subject's left from the sternal midline (101, 702) along the surface of the thorax; and (viii) positioning the six ECG electrodes for precordial leads V1-V6 at the positions identified in steps (ii) to (vii); wherein the method is carried out on the same subject on at least two different time points; in particular wherein the human subject is an obese human subject.. (i) determining the horizontal level of the electrodes for leads V4, V5 and V6 (102, 703), wherein the horizontal level (102, 703) is determined to be between (0.088 x body height) [cm] and (0.092 x body height) [cm] downwards from the sternal notch along the sternal midline (101, 702); (ii) marking the position of the electrode for lead V1 (104, 708) from 2.8 cm to 3 cm above the horizontal level (102, 703) along the sternal midline (101, 702), and from 2.9 cm to 3.5 cm to the subject's right from the sternal midline (101, 702); (iii) marking the position of the electrode for lead V2 (105, 709) from 2.8 cm to 3 cm above the horizontal level (102, 703) along the sternal midline (101, 702), and from 2.9 cm to 3.5 cm to the subject's left of the sternal midline (101, 702); (iv) marking the position for the electrode for lead V4 (107, 704) at the horizontal level (102, 703) and (body height/16) ± 1 [cm] to the subject's left from the sternal midline (101, 702) along the surface of the thorax; (v) marking the position for the electrode for lead V3 from (0.023 x body height) [cm] to (0.025 x body height) [cm] from the position of the electrode for lead V2 (105, 709) to the direction of the position for the electrode for lead V4 (107, 704) along the connecting line formed by the position of the electrode for lead V2 (105, 709) and the position of the electrode for lead V4 (107, 704); (vi) marking the position for the electrode for lead V5 at the horizontal level (102, 703) and ((3 x body height)/32) ± 1 [cm] to the subject's left from the sternal midline (101, 702) along the surface of the thorax; (vii) marking the position for the electrode for lead V6 at the horizontal level (102, 703) and (body height/8) ± 1 [cm] to the subject's left from the sternal midline (101, 702) along the surface of the thorax; and (viii) positioning the six ECG electrodes for precordial leads V1-V6 at the positions identified in steps (ii) to (vii); wherein the method is carried out on the same subject on at least two different time points; in particular wherein the human subject is an obese human subject..