Persistent rains prevented play on the last four days and only 22 over could be bowled on the opening day of the match. The wash out denied India the opportunity to defend the top spot which they had reclaimed from Australia last week.
The result of the fourth and final Test means India won the series against the West Indies by 2-0, finishing on 110 points - one behind Pakistan and two ahead of third-ranked Australia.
India had entered the series on 112 points, 44 points ahead of eighth-ranked West Indies. And because the rankings are weighted to reflect this difference, India's failure to win by a better margin has resulted in it dropping two points and the West Indies earning two points.
"There is no greater feeling than to achieve the number-one ranking in the most traditional and purest format of the sport. This is what cricketers play for and want to achieve in their careers," Pakistan skipper Misbah-ul-Haq said.
For Pakistan, Misbah-ul-Haq's side has become only the fifth team after Australia, England, India and South Africa to top the ICC Test rankings since these were introduced in 2003.
ICC Chief Executive David Richardson congratulated Pakistan on achieving the number-one Test ranking.
The battle for the number-one ranking between the two traditional rivals will resume next month when New Zealand visit India and Pakistan host the West Indies in the UAE.
Both the series will be three-Test rubbers.
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