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Even if your organization is not on Instagram, patients, and family are likely uploading photos from your facilities every day.
Like FourSquare, Instagram has a geolocation option, allowing users to "check in" and name the location where their photo was taken. So even if you're not sold on having an official Instagram yet, it's good to keep an eye on it from your personal account—you can learn about the positive things people are experiencing, and also catch any problem areas.
You'd be smart to check your hospital's hashtags on Instagram too—I went into my local hospital's hashtag and found a slew of photos, ranging from happy post-op smiles to unhappy waiting room scenes, where the user complains about wait times. (There were also several staff members posting selfies taken in the bathroom, so it may be smart to add Instagram to your employee social media guidelines, too.)
Like Facebook and Twitter, Instagram is only going to keep growing, both among consumers and marketing professionals. And, as the old adage goes, a picture is worth a thousand words (unlike Twitter's 140 characters).