WASHINGTON — The House, just before 1 a.m. Saturday, passed an emergency relief package to address the sweeping effects of the coronavirus pandemic and cushion the economic blow to the most vulnerable Americans.

The legislation, the result of round-the-clock negotiations between Speaker Nancy Pelosi and Treasury Secretary Steven Mnuchin, includes a series of measures intended to bolster the safety net for families and workers whose livelihoods and health are affected by the disease. With President Donald Trump weighing in late to voice his approval — in a tweet Friday evening, only hours before the vote — senators are expected to take up the package in the coming week when they return to Washington.

It is unclear how much the package will cost, because the Congressional Budget Office, the independent federal agency that assesses the revenue effects of legislation, did not have time to calculate a price tag.

Lawmakers from both parties have said that they plan to consider additional stimulus measures in future legislation that is already being discussed.

Here’s what’s in the package that passed the House early Saturday.

It allows for free coronavirus testing for all, including the uninsured.

As the White House moved on Friday to catch up with the surging demand for coronavirus testing, Pelosi emphasized that “testing, testing, testing” would be the centerpiece of the legislation.

The final package includes a number of waivers to allow the costs of tests to be covered by insurance and federal government programs. It also includes a 6.2-percentage point increase in federal payments to Medicaid for states.

There is also $64 million for the Indian Health Service to cover the costs of coronavirus diagnostic testing for members of federally recognized Native American tribes. The Department of Veterans Affairs would receive $60 million to provide testing for veterans, while the National Disaster Medical System would receive $1 billion to reimburse the costs of testing and services to people without health insurance.

There is paid sick leave for workers — but millions aren’t covered.

The measure gives some workers two weeks of paid sick leave and up to three months of paid family and medical leave, equal to no less than two-thirds of their pay. The provision is aimed at encouraging people to follow the advice of public health officials who have said the best way to contain the spread of the virus is to have anyone experiencing symptoms stay at home.

But those benefits only apply to employees of businesses with fewer than 500 employees, or the government, who are infected by the virus, quarantined, have a sick family member or are impacted by school closures. Large employers are excluded, and the Labor Department will have the option of exempting workers at any company with fewer than 50 employees if it determines that providing paid leave “would jeopardize the viability of the business as a going concern.”

Those exemptions could potentially exclude nearly 20 million workers. About 59 million Americans work for companies with 500 or more employees, according to the Bureau of Labor Statistics, and about 6.5 million of them do not have any paid sick days. Another 12 million work for companies with fewer than 50 employees and do not have paid sick days. (Some large companies have announced since the outbreak began that they will provide paid leave for workers who get the virus. Walmart said it would give up to two weeks of pay; Target said it would give 14 days.)

The bill also limits benefits to workers who are sick, subject to a quarantine or caring for a family member; it stops short of what some public health experts have called for — effectively paying any worker to stay home in order to reduce the spread of the virus.

It also excludes “certain health care providers and emergency responders” from the benefit.

Companies covered by the policy will not foot the bill for paid leave. The government is providing new tax credits to both help offset the costs of accommodating the new mandate and lessen the economic impact of the outbreak.

The paid leave provisions were among the most contentious elements of the legislation. Republicans objected to a proposal by Democrats to establish a permanent paid sick leave entitlement for all families, according to a Democratic aide familiar with the negotiations, who spoke on condition of anonymity to describe the private negotiations.

The provision would expire in a year, at the insistence of Republicans, and exemptions are available for small businesses.

The package increases funding for food assistance programs.

The bill includes about $1 billion for food security programs aimed at helping those who may struggle to get access to meals during the pandemic, including those who rely on the Supplemental Nutrition Assistance Program, food banks and free or reduced-price lunch at school.

Those new funds include $500 million to help provide nutritious food to low-income pregnant women or mothers with young children who lose their jobs as a result of the coronavirus outbreak, and $400 million to help local food banks purchase, store and distribute food. There is also $100 million to provide nutrition assistance grants to Puerto Rico, American Samoa and the Northern Mariana Islands and $250 million to provide additional home-delivered and prepackaged meals to low-income seniors who rely on federal programs.

The legislation allows for emergency food assistance to households with children who would receive free or reduced-price meals in school if they close for five days or longer.

Democrats also included language that bars the administration from pushing ahead with tougher work requirements for food stamps beginning April 1. Under the package, the work and work training requirements for SNAP would be suspended during the coronavirus pandemic. It strengthens unemployment insurance benefits.

The legislation provides $1 billion in 2020 for emergency grants to states to assist with processing and paying unemployment insurance.

Half of those funds would be used to provide immediate additional funding to all states for staffing, technology and other administrative costs. The other half would be used for emergency grants to states that experienced at least a 10% increase in unemployment.