Harry; In Trade Like an O'Neil Disciple, in the chapter Dr. K's Market Direction Model, pg 231-232.
"In very rare instances, a follow-through day can occur on the third day of the rally attempt but all 3 days must be on increasing volume such as January 15-17, 1991, on the NASDAQ Composite, or the prior 3 weeks must be relatively tight such as the weeks leading up to the follow-through day on January 5, 1987."

On 4/5 the NASDAQ close was at the top of the range, but 4/8 was on decreased volume. Yesterday volume increased, but was less than volume on 4/5, so the last 3 days would not fulfill this definition.
Today is another story.

Best regards,
Robert