The Sandinista-run Supreme Electoral Council maintains that 90 percent of the eligible voters have been registered.
Mr Capriles has refused to accept the results given by the National Electoral Council.
The National Electoral Council said the results, which it announced on Sunday night, were "irreversible".
The electoral council, or what remains of it, now says the decision is final.
Last November, the Supreme Electoral Council received national and international criticism following irregularities in municipal elections.
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The electoral council failed to meet his "deadline" of 25 April to issue details of the audit.
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"It has developed with total normalcy, with total calmness, " said Sandra Oblitas of the National Electoral Council.
Using the same pretext, the Liberal-dominated electoral council last month barred Mr Alvarado from running for president.
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Between them the two big parties in effect control the Supreme Electoral Council that oversees Venezuela's elections.
Mr Capriles demanded details of an audit of the vote the electoral council says it will carry out.
Venezuela's electoral council is currently conducting an audit of the votes, which Mr Capriles has dismissed as a "farce".
On Thursday, the National Electoral Council offered a full audit of the votes, which will last for another month.
Chavista legislators are calling for their arrest, saying they were usurping the electoral council's role by organising the primary.
Mr Angulo, a member of the electoral council, refused to approve the result.
Moreover, did they forget that Chavez controls the national electoral council and all the corners of the electoral machine?
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He accused opposition protesters of attacking government clinics and the house of electoral council President Tibisay Lucena, without offering details.
Ms Oblitas, deputy head of the National Electoral Council (CNE), spoke to reporters at the commission's headquarters in the capital, Caracas.
Venezuela's National Electoral Council says that more than 100, 000 Venezuelans are registered to vote abroad at diplomatic offices in 88 countries.
Mr Maduro won by a margin of 1.49 percentage points over Mr Capriles, according to official figures released by the electoral council.
The National Electoral Council is due to formally proclaim Mr Maduro's victory at a ceremony and rally in Caracas later on Monday.
Maduro secured 50.8% of votes in Sunday's election, while opposition candidate Henrique Capriles Radonski won 49%, Venezuela's National Electoral Council said.
At Capriles' campaign headquarters, people hung their heads quietly as the results were announced by an electoral council stacked with government loyalists.
Moreover, Mr Ortega colluded with Mr Aleman in a pact that gave their parties control over institutions such as the electoral council.
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Non-Bolivarian allies such as Argentina broadcasted live the announcement of the president of the Venezuelan National Electoral Council declaring Chavez the victor.
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The National Electoral Council's decision to audit all the paper receipts of electronic votes is seen as a major concession to the opposition.
In June of 2008, the Nicaraguan Supreme Electoral Council disqualified opposition political parties including Sandinista Renovation Movement and the Conservative Party from participating.
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On Tuesday, the electoral council (CNE), which by a margin of 3-2 is pro-Chavez, ruled that only 1.8 million signatures could be certified.
As the National Electoral Council proclaimed Maduro the victor, people stood on their balconies in Caracas apartment buildings banging pots and pans in protest.
The electoral council announced that it would pull the fingerprinting machines, but this was not enough to keep the opposition groups in the contest.
Mr Smarth also denounced Mr Aristide's friends on the electoral council for rigging the first round of Senate elections that were held last April.
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