get_current_screen() inside add_action(‘admin_menu’)

I don’t know exactly what you are trying to accomplish but you seem to be dealing with meta boxes. If so there are a number of meta box specific hooks.

do_action('add_meta_boxes', $post_type, $post);
do_action('add_meta_boxes_' . $post_type, $post);

do_action('do_meta_boxes', $post_type, 'normal', $post);
do_action('do_meta_boxes', $post_type, 'advanced', $post);
do_action('do_meta_boxes', $post_type, 'side', $post);

http://core.trac.wordpress.org/browser/tags/3.5.1/wp-admin/edit-form-advanced.php#L165

As well as the admin_head* hooks

do_action("admin_head-$hook_suffix");
do_action('admin_head');

http://core.trac.wordpress.org/browser/tags/3.5.1/wp-admin/admin-header.php#L68

All of which run after global $current_screen is set here: http://core.trac.wordpress.org/browser/tags/3.5.1/wp-admin/admin-header.php#L18

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