There is a certification requirement for this. This doesn't prescribe a procedure nor does it consider starting the manoeuvre at Vref-15 but it's called a landing climb and you must have landing climb speeds in the AFM. You may find that it's the same as VREF as one trick used in certification is to increase VREF to a speed that meets the climb requirement. Hence in some AC it's called Landing climb and reference speed. The gear is down and the flaps in the landing position.
CS 25.119 Landing climb: all-enginesoperating
In the landing configuration, the steady gradient of
climb may not be less than 3·2%, with –
(a) The engines at the power or thrust that is
available 8 seconds after initiation of movement of
the power or thrust controls from the minimum flight
idle to the go-around power or thrust setting (see
AMC 25.119(a)); and
(b) A climb speed which is –
(1) Not less than –
(i) 1·08 VSR for aeroplanes with
four engines on which the application of
power results in a significant reduction in
stall speed; or
(ii) 1·13 VSR for all other
aeroplanes;
(2) Not less than VMCL; and
(3) Not greater than VREF.