Sample collector and test device

A sample collection device for assay comprising:

• a plunger, including a plunger arm coupled to a disk, where the plunger arm includes
• a first diameter portion, and
• a second diameter portion that is larger than the first diameter portion and where the disk is disposed on the second diameter portion;
• and
• a recess;
• a plug, including
• an end wall and
• a channel, where the end wall defines an opening holding the recess of the plunger and where the channel is configured for slidably receiving the first diameter portion of the plunger arm into the channel of the plug;
• and
• an expandable sponge coaxially disposed on the first diameter portion of the plunger arm,
• wherein the sample collection device is configured in
• a sample collection size when the first diameter portion and the second diameter portion of the plunger arm are outside the channel of the plug prior to collecting a sample with the expandable sponge;
• an expanded size when the first diameter portion and the second diameter portion of the plunger arm are outside the channel of the plug and the sample was collected with the expandable sponge such that the expandable sponge extends from the end wall of the plug to the disk over the first diameter portion of the plunger arm and the second diameter portion of the plunger arm providing an indication to a user that an adequate sample size was collected;
• and
• a sample retaining size when the first diameter portion of the plunger arm is slidably received into the channel of the plug expressing a portion of the sample from the expandable sponge while the second diameter portion of the plunger arm remains outside the channel of the plug retaining a portion of the sample in the expandable sponge.