The first week of our Children's Hospital fund-raising campaign is behind us, but the bulk of our work remains ahead.

We have rung up a first-week total that's more than double what we collected in the same period last year. But it is only about five percent of our final 1981-2 total. We need to make tracks, and we need to make them as soon as we can.

Here's how the figures look at the moment:

Grand total to date: $16,243.34.

Individual donors to date: 154.

Group donors to date: 27.

One of the reasons that top line looks so good is that 854 people have entered our "Single" contest. They have contributed $1,588 in the process, which has been added into the grand total, of course.

In case you missed the details when we announced them in November, many people feel that the word "single" has a negative connotation. So the contest is designed to replace it with a word that describes the unmarried state, but more accurately and in a less "loaded" way.

To enter, write down your "replacement word" and your reasons for choosing it and send it to the address below, with a donation to Children's Hospital of at least $1. You may enter regardless of marital status, although you must be at least 18 years old.

First prize is an all-expenses-paid week in the Bahamas for one, courtesy of Club Med and the group that's sponsoring the contest, Entrees, Inc. There are more than a dozen additional prizes, none of them slouches. The contest runs through Jan. 31.

Many of the entries have been very clever, and many have been very funny. But the funniest sight of all has been Yours Truly taking large wads of one-dollar bills sent in by contest entrants to the bank.

It's only a matter of time before the suspicious tellers ask me if I've given up a newspaper career in favor of numbers running.

So far at least, the only numbers I'm running are those for Children's. The bigger they grow, the happier I get. Please give today. Even $5 or $10 will help. Kids who might otherwise have to be turned away will receive medical treatment that may save their lives, all because you care.

To contribute to the campaign:

Make a check or money order payable to Children's Hospital and mail it to Bob Levey, The Washington Post, Washington, D.C., 20071.