BP was set to continue reviewing testing procedures Wednesday, a day after delaying what have been referred to as “integrity tests” on a new cap placed on the leaking Gulf wellhead. Originally, BP had expected the tests to begin Tuesday afternoon, but late Tuesday night officials announced that additional analysis of the well testing procedures were needed.

The decision to delay testing was made around 4:30 p.m. local time Tuesday after officials decided they needed an additional 24 hours to make sure the tests will go as planned, Kent Wells, BP senior vice president, told reporters Wednesday.

The integrity tests will measure pressure inside the well and are expected to last anywhere from six to 48 hours. A higher pressure reading would mean the leak is stopped, while a lower pressure reading indicates that oil is escaping from other parts of the well.

Meanwhile, work on the two relief wells, viewed as the ultimate solution to the leak, was suspended.

Wells said work on the first well was delayed as an additional safety precaution, since it is possible, though unlikely, that shutting the leaking well as part of the integrity test could cause the back side of the relief well to blown out.

Efforts on the second well were temporarily suspended “to ensure there is no interference with the first relief well,” BP said in a statement Tuesday.